+publisher:"Delft University of Technology" +contributor:("Lhermitte, Stef")

Delft University of Technology

1. Izeboud, Maaike (author). Cloud Radiative Impact on Antarctic Ice Shelves.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:6b613527-92bc-4b17-aa37-82b2d25800f9

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An accurate prediction of global sea-level rise requires that the cause of recent and intensifying glacier acceleration along the Antarctic ice sheet (AIS) coastal margins… (more)

Subjects/Keywords: cyrosphere; Ice shelves; Antarctica; Antarctic Ice Sheet; Cloud Radiation; melt; climate change

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APA (6^th Edition):

Izeboud, M. (. (2019). Cloud Radiative Impact on Antarctic Ice Shelves. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:6b613527-92bc-4b17-aa37-82b2d25800f9

Chicago Manual of Style (16^th Edition):

Izeboud, Maaike (author). “Cloud Radiative Impact on Antarctic Ice Shelves.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:6b613527-92bc-4b17-aa37-82b2d25800f9.

MLA Handbook (7^th Edition):

Izeboud, Maaike (author). “Cloud Radiative Impact on Antarctic Ice Shelves.” 2019. Web. 06 Mar 2021.

Vancouver:

Izeboud M(. Cloud Radiative Impact on Antarctic Ice Shelves. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:6b613527-92bc-4b17-aa37-82b2d25800f9.

Council of Science Editors:

Izeboud M(. Cloud Radiative Impact on Antarctic Ice Shelves. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:6b613527-92bc-4b17-aa37-82b2d25800f9

Delft University of Technology

2. Izeboud, Maaike (author). Greenland Ice Sheet Memory for Cloud Radiation determines its impact on the Surface Mass Balance.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:af4a3f56-0cba-461b-b95b-cc16a6d942cd

► As of yet, there is no consensus on the role of the cloud radiative effect (CRE) on the Greenland Ice Sheet (GrIS). This study focuses… (more)

Subjects/Keywords: Greenland ice sheet; Cloud Radiation; Firn memory

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APA (6^th Edition):

Izeboud, M. (. (2019). Greenland Ice Sheet Memory for Cloud Radiation determines its impact on the Surface Mass Balance. (Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:af4a3f56-0cba-461b-b95b-cc16a6d942cd

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Izeboud, Maaike (author). “Greenland Ice Sheet Memory for Cloud Radiation determines its impact on the Surface Mass Balance.” 2019. Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:af4a3f56-0cba-461b-b95b-cc16a6d942cd.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Izeboud, Maaike (author). “Greenland Ice Sheet Memory for Cloud Radiation determines its impact on the Surface Mass Balance.” 2019. Web. 06 Mar 2021.

Vancouver:

Izeboud M(. Greenland Ice Sheet Memory for Cloud Radiation determines its impact on the Surface Mass Balance. [Internet] [Thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:af4a3f56-0cba-461b-b95b-cc16a6d942cd.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Izeboud M(. Greenland Ice Sheet Memory for Cloud Radiation determines its impact on the Surface Mass Balance. [Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:af4a3f56-0cba-461b-b95b-cc16a6d942cd

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

3. Antonissen, Coco (author). Organization of Cumulus Convection over (sub)tropical oceans.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:d868273a-b028-4273-8380-ff1628ecabd5

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Climate on Earth is changing rapidly. In order to take the right measures it is important to know with which magnitude and rate the warming… (more)

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Climate on Earth is changing rapidly. In order to take the right measures it is important to know with which magnitude and rate the warming of the climate continues in the future. However, climate models currently predict different scenarios. The differing in response of shallow cumulus clouds to a warming climate explains the largest part of the spread of climate sensitivity in these models. It is known that clustered clouds have a different climate feedback than randomly distributed clouds and that we can expect more clustered cloud fields in a warmer climate. It is however unknown how these clouds respond and what the exact difference in climate feedback is. Future research must provide us with more insights and eventually a better understanding of the response of shallow cumulus clouds to warming. However, in order to investigate this an objective measure of the degree of cloud organization is necessary, something that is currently lacking. In this thesis a dimensionless combined organization measure is introduced that can be applied to a large range of cloud field organizations on different field sizes. This is a combined measure, as it makes use of the existing organization index I_org and the size of clouds and clear sky areas in the cloud field. A different approach on calculating I_org was introduced taking into account the sizes of the clouds, resulting in an useful and more realistic values from this parameter. The results of the combined organization measure were compared to a visual inspection of 557 cloud fields with dimensions of 10x10 degree, which showed promising results. Sub-fields of 5x5 degree and 2.5x2.5 degree were also analysed, which showed that the combined organization measure could often be applied on smaller scales as well but yielded some problems when areas contained either no or little clouds or some very large ones. It was concluded that the newly developed method is an improvement of the already existing method, providing scientists with a better and more reliable index to quantify the degree of cloud organization.

Civil engineering | Geoscience and Remote Sensing

Advisors/Committee Members: Siebesma, Pier (mentor), Nuijens, Louise (mentor), Lhermitte, Stef (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Atmoshpere; Remote Sensing; Cloud Organization

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APA (6^th Edition):

Antonissen, C. (. (2019). Organization of Cumulus Convection over (sub)tropical oceans. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d868273a-b028-4273-8380-ff1628ecabd5

Chicago Manual of Style (16^th Edition):

Antonissen, Coco (author). “Organization of Cumulus Convection over (sub)tropical oceans.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:d868273a-b028-4273-8380-ff1628ecabd5.

MLA Handbook (7^th Edition):

Antonissen, Coco (author). “Organization of Cumulus Convection over (sub)tropical oceans.” 2019. Web. 06 Mar 2021.

Vancouver:

Antonissen C(. Organization of Cumulus Convection over (sub)tropical oceans. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:d868273a-b028-4273-8380-ff1628ecabd5.

Council of Science Editors:

Antonissen C(. Organization of Cumulus Convection over (sub)tropical oceans. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:d868273a-b028-4273-8380-ff1628ecabd5

Delft University of Technology

4. Rosier, Job (author). Stability of the floating ice shelf of the Petermann glacier and its response to a changing environment.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:33bc746a-472d-4919-af26-e12896bf9abb

► Nearly all major glaciers in Greenland have reduced in size over the last two decades. An increase in the amount of ice transported from the… (more)

▼ Nearly all major glaciers in Greenland have reduced in size over the last two decades. An increase in the amount of ice transported from the Greenland ice sheet to the oceans is predicted following an increase in Arctic air and ocean temperatures. One of the last glaciers with a floating ice shelf and draining a substantial area of the Greenland ice sheet is the Petermann glacier in North West Greenland. With two major calving events in 2010 and 2012 the extent of its floating ice shelf was reduced to only half of that prior to 2010 and since 2016 new fractures indicate a new calving event is predicted to reduce the length of the glacier by ~14 km. Multiple studies have indicated that after the major calving event of 2012 the glacier accelerated and a new increase in the velocity, possibly linked to the next calving event, has already been observed. With every part of the glacier’s ice shelf that is lost the resistive force that holds the glacier back is reduced and the amount of ice drained to the ocean increases. Losing its entire ice shelf could lead to a significant increase in the contribution of the Petermann glacier to global sea level rise as the Petermann fjord extends inlands below sea level for nearly a hundred kilometers. This study uses ice thickness and surface elevation data combined with velocity data from different sources to analyze the current and future stability of the Petermann glacier. Ice thickness and the velocity data is used as input in a fracture model in order to investigate the different contributions of stress, thinning and an increase in the availability of surface water to the depth crevasses can reach. The areas on the glacier that show locations where crevasses penetrate deep into the ice indicate that the glacier is vulnerable to fracturing in those spots. Connected weak spots might indicate further potential for future calving events. The results derived from the thickness data and the subsequent melt rates show that near the grounding line the glacier is experiencing significantly larger melt rates than near the calving front. The high melt rates are concentrated in space and caused three large basal channels to form, which run downstream parallel to the flow direction. The location of the western channel corresponds to the location of fractures that initiated during the same time the channel deepened, indicating a relationship between an increase in melt rate and fracturing. This relation is also observed in the results from the fracture model, where there is enough water and the ice shelf thinness fractures are capable of penetrating deep in the glacier ice. The results also show that when the average melt rate between 2011 and 2017 continues to prevail the floating ice shelf of the Petermann might be gone within the next decade Advisors/Committee Members: Lhermitte, Stef (mentor), Mottram, Ruth (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: glacier; Climate change; Remote Sensing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rosier, J. (. (2019). Stability of the floating ice shelf of the Petermann glacier and its response to a changing environment. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:33bc746a-472d-4919-af26-e12896bf9abb

Chicago Manual of Style (16^th Edition):

Rosier, Job (author). “Stability of the floating ice shelf of the Petermann glacier and its response to a changing environment.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:33bc746a-472d-4919-af26-e12896bf9abb.

MLA Handbook (7^th Edition):

Rosier, Job (author). “Stability of the floating ice shelf of the Petermann glacier and its response to a changing environment.” 2019. Web. 06 Mar 2021.

Vancouver:

Rosier J(. Stability of the floating ice shelf of the Petermann glacier and its response to a changing environment. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:33bc746a-472d-4919-af26-e12896bf9abb.

Council of Science Editors:

Rosier J(. Stability of the floating ice shelf of the Petermann glacier and its response to a changing environment. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:33bc746a-472d-4919-af26-e12896bf9abb

Delft University of Technology

5. Klein, Jigme (author). Performance evaluation of the CWI BRDF-fitting method under cloud-contaminated conditions: A numerical experiment using PROSAIL.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:e16a9fdc-5f7f-4588-8f69-a64f07c24879

► Remote retrieval of Normalized Difference Vegetation Index (NDVI) over the Earth’s surface is a critical component of monitoring the surface processes of our planet. NDVI… (more)

▼ Remote retrieval of Normalized Difference Vegetation Index (NDVI) over the Earth’s surface is a critical component of monitoring the surface processes of our planet. NDVI is a widely used and useful indicator of vegetation health and quantity however its retrieval using satellite data is hindered by the frequent presence of clouds in the Earth’s atmosphere. Zeng et al. (2016) developed a novel technique that estimates a surface's Bidirectional Reflectance Distribution Function (BRDF) with a RossLiMaignan (RLM) BRDF model from a set of observations. This method, the ChangingWeight Iterative (CWI) method, uses iterative a posteriori estimation of observation errors to reduce the impact of cloud-contaminated measurements in the sample. Its performance was compared to two conventional methods, ordinaryleast squares (OLS) and LiGao BRDF-fitting. The three different BRDFfitting methods were compared in a numerical experiment. 6,000 surface types covering a broad range of surface types were modeled using the canopy radiative transfer model PROSAIL. For each surface, sets of pseudo-observations of the surface’s red and NIR band reflectance were generated using realistic suntarget view geometries from the MODIS and MERSI satellite sensors. The effects of cloudcontamination were simulated by adding different numbers of cloudcontaminated observation to the sample, with varying degrees of contamination. The RLM BRDF model was fitted to these samples using the three different methods to estimate the BRDF model parameters. These were subsequently used to calculate a NDVI composite value. Each method’s estimate was compared to a reference value generated by PROSAIL. Results for the 6,000 surfaces confirmed that the CWI method is more noiseresistant than OLS and LiGao in situations with many observations (i.e. a large sample), and resulted in estimates that more closely matched the reference value from PROSAIL, compared to the conventional LiGao and OLS methods. In scenarios of lowcloud contamination, all three methods failed to detect and significantly suppress the impact of noisy observations, which was expected from existing literature. For a largesized sample of 13 pseudoobservations studied for the validation site Mongu, Zambia, the CWI method was observed to have a very accurate performance, for up to 5 contaminated observations in the sample. With smaller sized samples of 8 and 10 for two other validation sites, it was found that the RMSE of the CWI method would suddenly increase approximately tenfold when the number of contaminated observations increased beyond 2 and 3, respectively. After these ’tipping points’, the LiGao method was more accurate and outperformed CWI. The CWI method therefore performed promisingly when given a large enough sample size, and in these cases it was more accurate than the conventional Li-Gao and OLS methods. However, when it fails to correctly identify noisy observations, its accuracy could decrease suddenly, which should be taken into consideration for operational use. Since… Advisors/Committee Members: Menenti, Massimo (mentor), Lhermitte, Stef (graduation committee), Lindenbergh, Roderik (graduation committee), LIU, Qinhuo (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Remote Sensing; BRDF; NDVI; simulation; PROSAIL; reflectance

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Klein, J. (. (2020). Performance evaluation of the CWI BRDF-fitting method under cloud-contaminated conditions: A numerical experiment using PROSAIL. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e16a9fdc-5f7f-4588-8f69-a64f07c24879

Chicago Manual of Style (16^th Edition):

Klein, Jigme (author). “Performance evaluation of the CWI BRDF-fitting method under cloud-contaminated conditions: A numerical experiment using PROSAIL.” 2020. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:e16a9fdc-5f7f-4588-8f69-a64f07c24879.

MLA Handbook (7^th Edition):

Klein, Jigme (author). “Performance evaluation of the CWI BRDF-fitting method under cloud-contaminated conditions: A numerical experiment using PROSAIL.” 2020. Web. 06 Mar 2021.

Vancouver:

Klein J(. Performance evaluation of the CWI BRDF-fitting method under cloud-contaminated conditions: A numerical experiment using PROSAIL. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:e16a9fdc-5f7f-4588-8f69-a64f07c24879.

Council of Science Editors:

Klein J(. Performance evaluation of the CWI BRDF-fitting method under cloud-contaminated conditions: A numerical experiment using PROSAIL. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:e16a9fdc-5f7f-4588-8f69-a64f07c24879

Delft University of Technology

6. van der Valk, Dirk (author). Assessment of surface melt with (In)SAR on Blue Ice Areas at the King Baudouin Ice Shelf.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:6e9076bd-e729-4ec5-afbd-aa843dee9c0b

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Blue ice areas, are areas in Antarctica where, either due to local heat sources (areas with lower albedo and thus more absorption of shortwave radiation… (more)

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Blue ice areas, are areas in Antarctica where, either due to local heat sources (areas with lower albedo and thus more absorption of shortwave radiation - i.e. Nunataks) or high windspeed, all the snow is melted or eroded away and the underlying (blue) ice is visible. This occurs often around the grounding line between the ice sheet and ice shelf. At this grounding line area, a micro climate exists above the blue ice, which increase surface melt, due to a combination of decreased albedo and warming due to the mixing of cold and warm air. Detection of surface melt on this blue ice is important because this warmer surface melt water results in the increase of hydrofracturing and as a result, the decrease of ice shelf stability. Radar imagery above snow areas is a effective method to detect surface melt, which also ensures a continuous data record. Above blue ice, this is continuous data record of surface melt is also desired, but not done yet and therefore the focus of this thesis is surface melt detection on blue ice with radar imagery. By using the method of Hui et al., 2014 to classify blue ice areas, it is shown that the blue ice area extent (non-stable blue ice) is increasing over the years in the peak of the melt season. However, the extent is slightly decreasing during the non-melt season (stable blue ice). The data of Sentinel-1B is used during the austral summer of 2017/2018, to detect surface melt on blue ice. This is done via interferometry (and the corresponding coherence) and with the backscatter coefficient. Coherence turns out the be an unreliable method to detect surface melt, since the influence of wind and precipitation on the decrease of coherence is dominant. Thus, surface melt detection via this method is difficult. Backscatter showed some potential to detect surface melt on blue ice, but due to the larger standard deviation than the actual decrease of backscatter (assumed due to surface melt), a clear distinction between blue ice and surface melt can not be made. Melt features, such as rivers, lakes and ponds are detectable with the backscatter, due to their distinctive shape. Since these melt features are linked to surface melt, backscatter can indirectly be used to detect surface melt on blue ice.

Applied Earth Sciences

Advisors/Committee Members: Lhermitte, Stef (mentor), Steele-Dunne, Susan (mentor), Lopez Dekker, Paco (mentor), Delft University of Technology (degree granting institution).

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

van der Valk, D. (. (2019). Assessment of surface melt with (In)SAR on Blue Ice Areas at the King Baudouin Ice Shelf. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:6e9076bd-e729-4ec5-afbd-aa843dee9c0b

Chicago Manual of Style (16^th Edition):

van der Valk, Dirk (author). “Assessment of surface melt with (In)SAR on Blue Ice Areas at the King Baudouin Ice Shelf.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:6e9076bd-e729-4ec5-afbd-aa843dee9c0b.

MLA Handbook (7^th Edition):

van der Valk, Dirk (author). “Assessment of surface melt with (In)SAR on Blue Ice Areas at the King Baudouin Ice Shelf.” 2019. Web. 06 Mar 2021.

Vancouver:

van der Valk D(. Assessment of surface melt with (In)SAR on Blue Ice Areas at the King Baudouin Ice Shelf. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:6e9076bd-e729-4ec5-afbd-aa843dee9c0b.

Council of Science Editors:

van der Valk D(. Assessment of surface melt with (In)SAR on Blue Ice Areas at the King Baudouin Ice Shelf. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:6e9076bd-e729-4ec5-afbd-aa843dee9c0b

Delft University of Technology

7. Dooren, Mirja (author). Combining microwave and optical remote sensing to monitor rivers in monsoon affected regions.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:920a2a3e-e75e-474e-809b-6297c6082986

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Understanding the river dynamics is very important to be able to make use of all river functions and to protect ourselves against floods. Hydrodynamic models… (more)

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Understanding the river dynamics is very important to be able to make use of all river functions and to protect ourselves against floods. Hydrodynamic models are used to predict river behaviour and one of the input parameters is the river geometry. In-situ measuring of river geometry can be very expensive and time consuming. Remote sensing offers a more efficient method to monitor rivers, because it has the ability to continuously monitor the Earth surface at multiple scales. Rivers in monsoon dominated regions show a strong seasonal variation in discharge and have a high variability in morphodynamics. Therefore it is very important to have a high spatial-temporal resolution of river geometry data as input for hydrodynamic models to keep up with the changes in the river. Both optical and microwave images can be used in providing information about the river geometry. The microwave images need a lot of processing to deal with noise, but they are not limited by clouds, whereas optical sensors are troubled by clouds but produce less noise. The benefit of combining these methods is because the microwave images could fill the gap of cloud covered optical images during the monsoon. The main result from this thesis is that more investigation is needed on how to deal with the noise produced by the microwave images before the methods can be combined. Nevertheless it is shown that using the Canny Edge detector and Otsu thresholding improves the results. With this research we are a small step further in global river monitoring. This is important in particular for parts of the world where rivers are not continuously monitored because they are situated in hard to reach terrain and because the country will not invest in local gauge stations. Having more knowledge about river behaviour will help to get a better understanding of water losses along the river course, habitat change and flood risks.

Geoscience and Remote Sensing

Advisors/Committee Members: Lhermitte, Stef (mentor), Sloff, Kees (graduation committee), Lindenbergh, Roderik (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: remote sensing; radar; optical; landsat; sentinel; river; myanmar; monsoon

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APA (6^th Edition):

Dooren, M. (. (2019). Combining microwave and optical remote sensing to monitor rivers in monsoon affected regions. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:920a2a3e-e75e-474e-809b-6297c6082986

Chicago Manual of Style (16^th Edition):

Dooren, Mirja (author). “Combining microwave and optical remote sensing to monitor rivers in monsoon affected regions.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:920a2a3e-e75e-474e-809b-6297c6082986.

MLA Handbook (7^th Edition):

Dooren, Mirja (author). “Combining microwave and optical remote sensing to monitor rivers in monsoon affected regions.” 2019. Web. 06 Mar 2021.

Vancouver:

Dooren M(. Combining microwave and optical remote sensing to monitor rivers in monsoon affected regions. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:920a2a3e-e75e-474e-809b-6297c6082986.

Council of Science Editors:

Dooren M(. Combining microwave and optical remote sensing to monitor rivers in monsoon affected regions. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:920a2a3e-e75e-474e-809b-6297c6082986

Delft University of Technology

8. Scherrenberg, Meike (author). Future Greenland Melt on Multi-Century and Multi-Millennial Time Scales assessed with the Community Ice Sheet Model version 2.1.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:a74f16c7-dd7e-4e0a-a0c8-9eefe45ca1c3

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The Greenland Ice Sheet is the world’s second largest ice sheet, storing an equivalent of 7.3 meters of sea level rise. Due to climate change,… (more)

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The Greenland Ice Sheet is the world’s second largest ice sheet, storing an equivalent of 7.3 meters of sea level rise. Due to climate change, the Greenland ice sheet is currently losing mass at an accelerated rate. Ice sheet models are used to project long term melt of the ice sheet, which are often forced by output from climate models. Most of the multi-millennium time scale ice sheet simulations conducted in the past used SMB calculations based on empirical relationships between melt and temperature (Positive-Degree Day schemes). In this thesis, I address the question of the future evolution of the Greenland ice sheet by means of an ice sheet model forced with an elevation dependent SMB field that accounts for the energy available for melt. This work focuses on key variables such as ice thickness, ice area, velocity and contribution to eustatic sea level rise, and assesses the reversibility of the mass loss. For this thesis, I performed uncoupled CISM2.1 simulations which were forced by the elevation- SMB field from a coupled CESM-CISM simulation. The coupled simulation used to force the ice sheet has a length of 160 years and a CO2 concentration that is increased with 1% per year from pre-industrial levels and capped at 4 times CO2. Time segments with 2x, 3x and 4x pre-industrial CO2 concentrations of this CESM-CISM run were used to force the ice sheet on multi-millennium time-scales. In addition, a Recovery from 4x CO2 was conducted in which the pre-industrial forcing from a coupled CESM-CISM simulation is re-introduced after 55% mass loss. The 2x, 3x and 4x CO2 scenarios resulted in a cumulative sea level rise of 0.49 m, 3.0 m, and 8.2 m by year 4,000. The 2x CO2 scenario resulted in limited retreat and stability within 4,000 years. No stability of the ice sheet was attained by year 8,000 in the 3x CO2 simulation, with a final Mass Balance of -108.8 Gt/yr (0.30 ± mm/yr). The 4x CO2 simulation resulted in the complete deglaciation of the ice sheet within 3,000 years. Despite the lower initial topography compared to the pre-industrial ice sheet, the Recovery from 4x CO2 simulation resulted into expansion of the ice sheet. Within 4,000 years, the mass increased from 46% to 67% relative to the pre-industrial ice sheet.

Civil engineering | Geoscience and Remote Sensing

Advisors/Committee Members: Vizcaino, Miren (mentor), Muntjewerf, Laura (mentor), Lhermitte, Stef (graduation committee), Riva, Riccardo (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Greenland; Climate Change; Future Melt Projections

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Scherrenberg, M. (. (2019). Future Greenland Melt on Multi-Century and Multi-Millennial Time Scales assessed with the Community Ice Sheet Model version 2.1. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:a74f16c7-dd7e-4e0a-a0c8-9eefe45ca1c3

Chicago Manual of Style (16^th Edition):

Scherrenberg, Meike (author). “Future Greenland Melt on Multi-Century and Multi-Millennial Time Scales assessed with the Community Ice Sheet Model version 2.1.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:a74f16c7-dd7e-4e0a-a0c8-9eefe45ca1c3.

MLA Handbook (7^th Edition):

Scherrenberg, Meike (author). “Future Greenland Melt on Multi-Century and Multi-Millennial Time Scales assessed with the Community Ice Sheet Model version 2.1.” 2019. Web. 06 Mar 2021.

Vancouver:

Scherrenberg M(. Future Greenland Melt on Multi-Century and Multi-Millennial Time Scales assessed with the Community Ice Sheet Model version 2.1. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:a74f16c7-dd7e-4e0a-a0c8-9eefe45ca1c3.

Council of Science Editors:

Scherrenberg M(. Future Greenland Melt on Multi-Century and Multi-Millennial Time Scales assessed with the Community Ice Sheet Model version 2.1. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:a74f16c7-dd7e-4e0a-a0c8-9eefe45ca1c3

Delft University of Technology

9. Pinson, Stijn (author). Design and implementation of a novel method for creating glacial velocity time series for the Himalayan region using the optical Landsat database.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:14b4ee4d-3c39-4c77-bdae-21881570d297

► Glaciers play an important role in sea level predictions and are an important supplier of fresh water. Understanding the physics and dynamics of glaciers is… (more)

▼ Glaciers play an important role in sea level predictions and are an important supplier of fresh water. Understanding the physics and dynamics of glaciers is important in local and global climate predictions and predictions of fresh water supplies. The Himalayas are the biggest storage of fresh water outside the polar regions with many different local climates and glaciers. One important glacier parameter used in dynamic studies is the flow velocity, as the flow velocity is used as a boundary condition in mass balance and run-off models. The flow velocity of a glacier is relatively easy to measure on a large scale using satellite missions and the increased coverage of satellite missions provides the means to large scale velocity monitoring. Robust methods for measuring large scale seasonal and long term velocity dynamics of glaciers, however, remain an elusive goal. The optical Landsat mission has a long history of monitoring and is thus useful for long term flow velocity analysis. Feature tracking algorithms applied on these Landsat images provide means of automatically calculating large scale velocities. Automated approaches for large scale analysis are difficult because of the lack of validation and good filtering techniques to deal with shadows, surface changes and clouds. Large scale temporal analysis is even harder because the errors arising in the flow velocity calculations are often large compared to the velocities due to the short periods between the images from which the velocities are calculated. This research proposes, implements and tests a new method for automatically creating large scale velocity time series using the optical Landsat database and feature tracking in the Himalayas. Where normally velocity time series consists of consecutive single velocity fields, the novel method uses combinations of velocities to estimate these single velocities. This method is tested against results from single velocity fields for the Everest region and the Karakoram region. A sensitivity and parameter analysis provides the best parameter settings for the new method. The result is a novel method that provides validation, robustness and acts as a filter for erroneous velocities. When possible, the new method increases or retains the number of results while increasing the precision. Furthermore, when the number of results is lower, it is due to filtering of erroneous velocities. The new method also provides an error indication which could be of use in future research. The main sources of errors: geo-location and precision of the feature tracking algorithm, are shown to have a large effect on the results and should be as small as possible. The magnitude of these errors make it difficult to measure seasonal changes in flow velocity for slow moving glaciers. Furthermore, Landsat 4-5 TM results are shown not to be useful for dense time series as the geo-location accuracy and artifacts from the TM scanner have a large effect on the precision of these results. The Landsat 8 velocity results,… Advisors/Committee Members: Lindenbergh, Roderik (mentor), Lhermitte, Stef (graduation committee), Menenti, Massimo (graduation committee), Gourmelen, N (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Glacier velocity; Landsat; Flow; Time series

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pinson, S. (. (2017). Design and implementation of a novel method for creating glacial velocity time series for the Himalayan region using the optical Landsat database. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:14b4ee4d-3c39-4c77-bdae-21881570d297

Chicago Manual of Style (16^th Edition):

Pinson, Stijn (author). “Design and implementation of a novel method for creating glacial velocity time series for the Himalayan region using the optical Landsat database.” 2017. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:14b4ee4d-3c39-4c77-bdae-21881570d297.

MLA Handbook (7^th Edition):

Pinson, Stijn (author). “Design and implementation of a novel method for creating glacial velocity time series for the Himalayan region using the optical Landsat database.” 2017. Web. 06 Mar 2021.

Vancouver:

Pinson S(. Design and implementation of a novel method for creating glacial velocity time series for the Himalayan region using the optical Landsat database. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:14b4ee4d-3c39-4c77-bdae-21881570d297.

Council of Science Editors:

Pinson S(. Design and implementation of a novel method for creating glacial velocity time series for the Himalayan region using the optical Landsat database. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:14b4ee4d-3c39-4c77-bdae-21881570d297

Delft University of Technology

10. Tollenaar, Veronica (author). Towards an Antarctic meteorite hotspot map.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:a1b5b764-0ba0-42d1-8918-3e681a24a4a1

► Meteorites contain information on the formation and evolution of the Solar System. Antarctica is the most productive region for collecting meteorites, as the visually contrasting… (more)

▼ Meteorites contain information on the formation and evolution of the Solar System. Antarctica is the most productive region for collecting meteorites, as the visually contrasting meteorites are easily detectable and tend to concentrate at specific areas exposing blue ice. Blue ice areas act as meteorite stranding surfaces (MSSs) if the flow of the ice sheet and specific geographical and climatological settings combine favorably. Previously, possible meteorite stranding surfaces were identified by chance or through visual examination of remote sensing data, which have limitations in discovering new locations for future meteorite searching campaigns. In this study, datasets are combined in a novel machine learning approach in order to estimate the likeliness of a blue ice area to be a meteorite stranding surface. Input data consists of positive and unlabeled observations. The ca. 2,500 positive observations are defined as the centers of regularly spaced grid cells containing one or more meteorite finds. The ca. 2,000,000 unlabeled observations, for which the presence of meteorites is unknown, are defined as the centers of regularly spaced grid cells overlaying blue ice areas. The size of a grid cell is 450 by 450 meter. Features of the observations, such as the surface velocity, the surface temperature, and the ice thickness, are extracted from geospatial datasets. Individual features and correlations between features indicate that positive observations differ from unlabeled observations. The unlabeled observations are classified as MSS or non-MSS by training a classifier with the nontraditional training set consisting of positive and unlabeled data. The obtained classification is validated and evaluated quantitatively with positive and negative observations, where the latter are defined after investigating fieldwork reports. With an estimated accuracy of 80%, the classification shows promising results. The influence of the different features on the classification does confirm the current, qualitative, understanding of the meteorite concentration mechanism and provides a quantification of how individual features affect the meteorite concentration. In the visualization of the as MSS-classified observations, the probabilistic character of the obtained results is considered by using a color scale ranging from yellow to red. These colors indicate how likely it is to find meteorites at a MSS-classified observation (i.e. the precision of the classification). This leaves the interpretation of the obtained meteorite hotspot map to the user. Advisors/Committee Members: Zekollari, Harry (mentor), Lhermitte, Stef (mentor), Tax, David (graduation committee), Lindenbergh, Roderik (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Antarctica; meteorites; Remote sensing; Big Data Analysis; Machine Learning

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tollenaar, V. (. (2020). Towards an Antarctic meteorite hotspot map. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:a1b5b764-0ba0-42d1-8918-3e681a24a4a1

Chicago Manual of Style (16^th Edition):

Tollenaar, Veronica (author). “Towards an Antarctic meteorite hotspot map.” 2020. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:a1b5b764-0ba0-42d1-8918-3e681a24a4a1.

MLA Handbook (7^th Edition):

Tollenaar, Veronica (author). “Towards an Antarctic meteorite hotspot map.” 2020. Web. 06 Mar 2021.

Vancouver:

Tollenaar V(. Towards an Antarctic meteorite hotspot map. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:a1b5b764-0ba0-42d1-8918-3e681a24a4a1.

Council of Science Editors:

Tollenaar V(. Towards an Antarctic meteorite hotspot map. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:a1b5b764-0ba0-42d1-8918-3e681a24a4a1

Delft University of Technology

11. Kharagjitsing, Manish (author). Optimizing Support Vector Machines with ISBA-A-gs Land Surface Variables as a Surrogate Model to Simulate ASCAT Derived Parameters.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:2a9c3314-57b6-4471-9d81-b79199e5ffbd

►

The TU-Wien developed a soil moisture retrieval algorithm that uses the incidence angle dependence of backscatter to obtain soil moisture estimates (Wagner et al., 1999).… (more)

▼

The TU-Wien developed a soil moisture retrieval algorithm that uses the incidence angle dependence of backscatter to obtain soil moisture estimates (Wagner et al., 1999). The core of this algorithm is a second order Taylor expansion with which the backscatter is normalized at a reference angle. Studies have shown that the first and second order derivative within this Taylor expansion, known as slope and curvature, are somehow related to the wet biomass and structure of vegetation. The general approach to forward model satellite observations with land surface variables in a data assimilation framework is through a radiative transfer model (Albergel et al., 2017). However, this requires plenty of assumptions about the vegetation canopy (such as stem height, shape, size, orientation etc.) and is therefore relatively inefficient for understanding the impact of soil moisture and vegetation dynamics on backscatter on a large scale. This study investigates the possibility of using support vector machines as a surrogate model instead of a radiative transfer model to link the TU-Wien normalized backscatter and slope to land surface variables soil moisture and leaf area index. The land surface variables are simulations from the CO2-responsive ISBA-A-gs land surface model. Support vector machines have the advantage of providing implicit kernel functions, which make them very useful for non-linear problems. The ISBA-A-gs data is provided by Météo-France. In total, 1324 support vector machines have been optimized through a cross validated grid search. The optimized hyperparameters were shown to have spatial consistency and look promising as an initial approach to forward modelling backscatter and slope. The SVM performances are further investigated through corresponding land cover types of grid points and the land surface variables.

Geoscience and Remote Sensing

Advisors/Committee Members: Lhermitte, Stef (mentor), Steele-Dunne, Susan (graduation committee), Coenders-Gerrits, Miriam (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: ASCAT; Remote Sensing; Machine Learning; Support Vector Machine

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kharagjitsing, M. (. (2020). Optimizing Support Vector Machines with ISBA-A-gs Land Surface Variables as a Surrogate Model to Simulate ASCAT Derived Parameters. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2a9c3314-57b6-4471-9d81-b79199e5ffbd

Chicago Manual of Style (16^th Edition):

Kharagjitsing, Manish (author). “Optimizing Support Vector Machines with ISBA-A-gs Land Surface Variables as a Surrogate Model to Simulate ASCAT Derived Parameters.” 2020. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:2a9c3314-57b6-4471-9d81-b79199e5ffbd.

MLA Handbook (7^th Edition):

Kharagjitsing, Manish (author). “Optimizing Support Vector Machines with ISBA-A-gs Land Surface Variables as a Surrogate Model to Simulate ASCAT Derived Parameters.” 2020. Web. 06 Mar 2021.

Vancouver:

Kharagjitsing M(. Optimizing Support Vector Machines with ISBA-A-gs Land Surface Variables as a Surrogate Model to Simulate ASCAT Derived Parameters. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:2a9c3314-57b6-4471-9d81-b79199e5ffbd.

Council of Science Editors:

Kharagjitsing M(. Optimizing Support Vector Machines with ISBA-A-gs Land Surface Variables as a Surrogate Model to Simulate ASCAT Derived Parameters. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:2a9c3314-57b6-4471-9d81-b79199e5ffbd

Delft University of Technology

12. Dijkstra, Fokke (author). Breakpoint detection through neural nets: A feasibility study.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:31e80f25-0e47-4e4e-99f0-26e936d43e90

►

A variety of statistical methods are available to detect sudden changes, or breakpoints, in time series when used as multi-temporal change detection technique. However, these… (more)

Subjects/Keywords: breakpoint detection; multi-temporal change detection; deep learning; neural nets

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dijkstra, F. (. (2020). Breakpoint detection through neural nets: A feasibility study. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:31e80f25-0e47-4e4e-99f0-26e936d43e90

Chicago Manual of Style (16^th Edition):

Dijkstra, Fokke (author). “Breakpoint detection through neural nets: A feasibility study.” 2020. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:31e80f25-0e47-4e4e-99f0-26e936d43e90.

MLA Handbook (7^th Edition):

Dijkstra, Fokke (author). “Breakpoint detection through neural nets: A feasibility study.” 2020. Web. 06 Mar 2021.

Vancouver:

Dijkstra F(. Breakpoint detection through neural nets: A feasibility study. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:31e80f25-0e47-4e4e-99f0-26e936d43e90.

Council of Science Editors:

Dijkstra F(. Breakpoint detection through neural nets: A feasibility study. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:31e80f25-0e47-4e4e-99f0-26e936d43e90

Delft University of Technology

13. Antonissen, Coco (author). The effectiveness of a snow fence in the dry Andes region of Chile.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:e905a287-a316-4c3a-a8e5-bbfcefb811fb

► The region of Coquimbo, Chile, is located adjacent to the dry Andes. Water is scarce, and with very little precipitation during spring and summer, water… (more)

Subjects/Keywords: snow; Snow fence; Andes; Digital camera images

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Antonissen, C. (. (2018). The effectiveness of a snow fence in the dry Andes region of Chile. (Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e905a287-a316-4c3a-a8e5-bbfcefb811fb

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Antonissen, Coco (author). “The effectiveness of a snow fence in the dry Andes region of Chile.” 2018. Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:e905a287-a316-4c3a-a8e5-bbfcefb811fb.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Antonissen, Coco (author). “The effectiveness of a snow fence in the dry Andes region of Chile.” 2018. Web. 06 Mar 2021.

Vancouver:

Antonissen C(. The effectiveness of a snow fence in the dry Andes region of Chile. [Internet] [Thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:e905a287-a316-4c3a-a8e5-bbfcefb811fb.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Antonissen C(. The effectiveness of a snow fence in the dry Andes region of Chile. [Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:e905a287-a316-4c3a-a8e5-bbfcefb811fb

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

14. Egbers, Ruben (author). Estimation of wintertime Arctic sea ice thickness with satellite scatterometers.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:fc61066f-7acc-49a8-8ceb-6223ce90c063

► Accurate information on Arctic sea ice thickness has been historically limited both spatially and temporally to spare submarine sonar measurements until the advent of satellite… (more)

▼ Accurate information on Arctic sea ice thickness has been historically limited both spatially and temporally to spare submarine sonar measurements until the advent of satellite altimeters such as ICEsat (operating from 2002 to 2008) and CryoSat-2 (operating from 2011 to present day). This study aims to use the historical record of normalized radar backscatter measurements from satellite Ku-band and C-band scatterometers (ERS, QuikSCAT and ASCAT), which have been continuously operating since 1992, to homogenize the satellite altimeter record and extend the record of Arctic sea ice thickness measurements backwards in time. This study is structured so as to first derive a set of empirical relationships between normalized backscatter measurements and wintertime sea ice thickness estimates in the Arctic using existing satellite altimeter records as a reference. Two separate scatterometer sea ice thickness models are produced using coincident scatterometer and altimeter observations, one for C-band sea ice thickness estimation using ASCAT and CryoSat-2 collocations, and another for Ku-band sea ice thickness estimation using QuikSCAT and ICESat collocations. Based on the agreement to the altimeter records, the estimation of wintertime sea ice thickness using the C-band and Ku-band scatterometer models is uncertain to within 0.5 m (1-sigma), that is, a precision similar to that of the original altimeter references. The homogenization of the satellite altimeter records cannot be done directly, because the ICESat and CryoSat-2 instruments operate in different periods, but it can be done indirectly by comparing the sea ice thickness estimates obtained from Ku-band (based on ICESat) and C-band (based on CryoSat-2) estimates during the years that the Ku-band and C-band scatterometers operate simultaneously. These overlap years have been used to verify the consistency between the C-band and Ku-band relationships, and to correct for a 0.55 m bias in the CryoSat-2 reference, having considered the earlier ICESat record as absolute standard. After removing this bias from the CryoSat-2 reference, the sea ice thickness estimates from C-band and Ku-band records agree to within 0.15 m (1-sigma). Moreover, the resulting scatterometer sea ice thickness models allow the introduction of new thickness thresholds from a previously existing backscatter-based classification of Arctic sea ice types, providing a thickness threshold of 1.54 m to define first year ice (FYI), and a thickness threshold of 2.25 m to separate second year ice (SYI) from older multiyear ice (old MYI). Ancillary datasets were used to investigate the correlations between backscatter-based sea ice thickness and physical variables, such as snow depth and surface deformation, in order to investigate possible sources of systematic error, which otherwise appear to be bound within 0.30 m (1-sigma). The maps of differences between scatterometer and altimeter sea ice thickness estimates were analysed in terms of collocated sea ice convergence, sea ice shear and snow depth parameters… Advisors/Committee Members: Belmonte Rivas, Maria (mentor), Lhermitte, Stef (graduation committee), Slobbe, Cornelis (graduation committee), Hanssen, Ramon (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Arctic; sea ice thickness; scatterometers; ERS; ASCAT; QuikSCAT; estimation; ICESat; CryoSat-2

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Egbers, R. (. (2019). Estimation of wintertime Arctic sea ice thickness with satellite scatterometers. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:fc61066f-7acc-49a8-8ceb-6223ce90c063

Chicago Manual of Style (16^th Edition):

Egbers, Ruben (author). “Estimation of wintertime Arctic sea ice thickness with satellite scatterometers.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:fc61066f-7acc-49a8-8ceb-6223ce90c063.

MLA Handbook (7^th Edition):

Egbers, Ruben (author). “Estimation of wintertime Arctic sea ice thickness with satellite scatterometers.” 2019. Web. 06 Mar 2021.

Vancouver:

Egbers R(. Estimation of wintertime Arctic sea ice thickness with satellite scatterometers. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:fc61066f-7acc-49a8-8ceb-6223ce90c063.

Council of Science Editors:

Egbers R(. Estimation of wintertime Arctic sea ice thickness with satellite scatterometers. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:fc61066f-7acc-49a8-8ceb-6223ce90c063

Delft University of Technology

15. Koenders, David (author); van den Munckhof, Gijs (author); van Egmond, Jessie Lynn (author); Brummelkamp, Judith (author); van Dongen, Kirsten (author). Improving water efficiency and crop yield on a sugarcane plantation in Xinavane, Mozambique: An analysis of irrigation practices, yield variability and the potential of a decision support system.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:dd56f7e2-8e70-41d2-8ccb-cd690b96c983

► This report contains the findings of a multidisciplinary project in Mozambique which ran from mid-November 2018 to mid-January 2019. This study is part of the… (more)

▼ This report contains the findings of a multidisciplinary project in Mozambique which ran from mid-November 2018 to mid-January 2019. This study is part of the IWACA-TECH project, which is an abbreviation for “Improved Water efficiency Control based on remote sensing TECHnologies. The goal is to increase water efficiency and crop yield without increasing the consumptive use of water, using remote sensing and Model Predictive Control (MPC). The structural water scarcity in the region points out the relevance of the IWACATECH project and with that this study. The research, carried out by students of Delft University of Technology, is of importance for both the company Tongaat Hulett and all inhabitants who are direct or indirect dependent on the water of the Incomati river. The study area on the plantation in Xinavane copes not only with inefficient irrigation water use but also suffers a sugarcane yield decline in recent years ??. Therefore, the overall aim of this report is to improve water efficiency and crop yield within Tongaat Hulett. To achieve this from a multidisciplinary perspective several research questions have been formulated. Although they all contribute to the overall aim, they do so from different angles and in varying degrees. Therefore, to increase the readability of the report, the research questions have been divided into three sections: (1) Irrigation Practices, (2) Field Assessment on Yield Variability and (3) Decision Support System. Fieldwork was conducted over a five week period in order to gather data. Groundwater levels were measured, water quality of irrigation, ground- and precipitation water samples was analysed and soil moisture content was measured. This led to further research of soil types and quality. Soil profiles along the edges of both fields were made revealing a shallow aquifer in the bad-performing field. Irrigation water quality seems to form no hazard, but ground water quality analyses revealed significantly high electrical conductivity levels and a high sodium adsorption ratio in areas without growth. These findings, combined with an analysis of the digital elevation map and socio-technical data revealed that evaporation of irrigation water seems to be a large contributor to the impaired crop growth. When excess water cannot run off, puddles are formed. When these puddles evaporate, salts can be taken up by the soil once the thickened irrigation water infiltrates. This process is strengthened by the clay soil layer and the shallow aquifer, which prevent water from infiltrating deeper into the ground. Results concerning remote sensing prove the relationship between soil moisture content and precipitation for meteo-station XNA-20. Combining spatial and temporal variability of soil moisture content with remote sensing can play an essential role in managing irrigation practices. For the decision support system, and in specific the controller part of the system, measurements have been done. It can be concluded that storage area and delay times can be considered insignificant, and… Advisors/Committee Members: Ertsen, Maurits (mentor), van Breukelen, Boris (mentor), Lhermitte, Stef (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: sugarcane; water efficiency; over-irrigation; soil quality; remote sensing; decision support system

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Koenders, David (author); van den Munckhof, Gijs (author); van Egmond, Jessie Lynn (author); Brummelkamp, Judith (author); van Dongen, K. (. (2019). Improving water efficiency and crop yield on a sugarcane plantation in Xinavane, Mozambique: An analysis of irrigation practices, yield variability and the potential of a decision support system. (Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:dd56f7e2-8e70-41d2-8ccb-cd690b96c983

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Koenders, David (author); van den Munckhof, Gijs (author); van Egmond, Jessie Lynn (author); Brummelkamp, Judith (author); van Dongen, Kirsten (author). “Improving water efficiency and crop yield on a sugarcane plantation in Xinavane, Mozambique: An analysis of irrigation practices, yield variability and the potential of a decision support system.” 2019. Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:dd56f7e2-8e70-41d2-8ccb-cd690b96c983.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Koenders, David (author); van den Munckhof, Gijs (author); van Egmond, Jessie Lynn (author); Brummelkamp, Judith (author); van Dongen, Kirsten (author). “Improving water efficiency and crop yield on a sugarcane plantation in Xinavane, Mozambique: An analysis of irrigation practices, yield variability and the potential of a decision support system.” 2019. Web. 06 Mar 2021.

Vancouver:

Koenders, David (author); van den Munckhof, Gijs (author); van Egmond, Jessie Lynn (author); Brummelkamp, Judith (author); van Dongen K(. Improving water efficiency and crop yield on a sugarcane plantation in Xinavane, Mozambique: An analysis of irrigation practices, yield variability and the potential of a decision support system. [Internet] [Thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:dd56f7e2-8e70-41d2-8ccb-cd690b96c983.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Koenders, David (author); van den Munckhof, Gijs (author); van Egmond, Jessie Lynn (author); Brummelkamp, Judith (author); van Dongen K(. Improving water efficiency and crop yield on a sugarcane plantation in Xinavane, Mozambique: An analysis of irrigation practices, yield variability and the potential of a decision support system. [Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:dd56f7e2-8e70-41d2-8ccb-cd690b96c983

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

16. Groot, kevin (author). Do the newly developed models of bare soil surface reflectance and thermal infrared image analysis improve the spatial estimation of soil water properties in the Noordoostpolder region, The Netherlands?.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:2635a6b2-201c-4623-935f-9b1959a37ea3

► Methodology Agriculture is an important sector to provide in our needs. Since 2000, the arable land per farmer increased with 66%. To help farmers managing… (more)

▼ Methodology Agriculture is an important sector to provide in our needs. Since 2000, the arable land per farmer increased with 66%. To help farmers managing their increasing amount of arable land, it is important to develop new techniques in example based on remote sensing data. One of the key parameters for agricultural management is the water availability in the area. The water availability can be clarified with help of two different soil water properties, soil water holding capacity and soil moisture content. The aim of this study is to estimate soil water properties at a scale of 30 meters based on bare soil surface reflectance and thermal infrared image analysis. In this study, two newly developed models are proposed to determine the spatial patterns of soil wetness. The first model is based on bare soil surface reflectance, named as SoilGrids30m, a spatial estimation model for clay content and organic matter content in the study area. These estimates are then used as input of pedotransfer functions to obtain spatial estimates of soil water holding capacity in the study area. The second model is based on the relation between the normalized difference vegetation index and the crop temperature, named as the soil wetness indicator. The soil wetness indicator is a representative of soil moisture content in the root zone of crops. Both models are evaluated against the soil moisture content estimates obtained from SEBAL. Soil water holding capacity is not directly related to soil moisture content. The hypothesis is therefore, soils with a high soil water holding capacity will tend to have higher soil moisture content estimates and vice versa during a long period of drought. The year 2018 has been used as reference year because of the extreme drought conditions in the months May until July. Conclusions The SoilGrids30m model improved the estimation of clay content and organic matter content in the study area compared to the existing coarser SoilGrids250m and SoilGrids1000m models. Especially, the organic matter content estimates significantly improves with help of the SoilGrids30m model. However, the influence of adding bare soil surface reflectance to the model was relatively low for both clay content (37%) and organic matter content (13%). The influence of bare soil surface reflectance only improved the clay content estimates compared to the SoilGrids1000m model. In all other cases, the target variable estimates did not improve by adding bare soil surface reflectance data. It can therefore be concluded that the improvement of the SoilGrids30m model is due to the use of a larger set of observation data from the study area and not because of the input of bare soil surface reflectance data. The obtained soil water holding capacity estimates with help of pedotransfer functions did not show reliable results compared to the soil moisture estimates of SEBAL. The highly empirical pedotransfer functions are the main cause of the unreliable results but also seepage and irrigation are important factors… Advisors/Committee Members: Alfieri, Silvia (mentor), Lhermitte, Stef (graduation committee), Bastiaanssen, Wim (mentor), Rijk, Bert (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Soil Moisture; Remote Sensing; Soil water holding capacity; Thermal infrared; Visible and near infrared

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Groot, k. (. (2019). Do the newly developed models of bare soil surface reflectance and thermal infrared image analysis improve the spatial estimation of soil water properties in the Noordoostpolder region, The Netherlands?. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2635a6b2-201c-4623-935f-9b1959a37ea3

Chicago Manual of Style (16^th Edition):

Groot, kevin (author). “Do the newly developed models of bare soil surface reflectance and thermal infrared image analysis improve the spatial estimation of soil water properties in the Noordoostpolder region, The Netherlands?.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:2635a6b2-201c-4623-935f-9b1959a37ea3.

MLA Handbook (7^th Edition):

Groot, kevin (author). “Do the newly developed models of bare soil surface reflectance and thermal infrared image analysis improve the spatial estimation of soil water properties in the Noordoostpolder region, The Netherlands?.” 2019. Web. 06 Mar 2021.

Vancouver:

Groot k(. Do the newly developed models of bare soil surface reflectance and thermal infrared image analysis improve the spatial estimation of soil water properties in the Noordoostpolder region, The Netherlands?. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:2635a6b2-201c-4623-935f-9b1959a37ea3.

Council of Science Editors:

Groot k(. Do the newly developed models of bare soil surface reflectance and thermal infrared image analysis improve the spatial estimation of soil water properties in the Noordoostpolder region, The Netherlands?. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:2635a6b2-201c-4623-935f-9b1959a37ea3

Delft University of Technology

17. van Esch, Thijs (author). Estimating snow cover decline using the RSLE in Google Earth Engine: A Caucasus case study.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:196d467a-f0ae-480d-a3e3-d2da97e821bc

►

Snow in mountainous areas is of great importance for the water supply in many catchments. To get data on snow cover, ground station data is… (more)

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Snow in mountainous areas is of great importance for the water supply in many catchments. To get data on snow cover, ground station data is not enough and, in many catchments, not available. Therefore, satellite data is used to measure snow cover. In this thesis the MODIS daily snow cover dataset (MOD10A1) is used. These images are obstructed by clouds. In order to create a complete dataset, the Regional Snowline Elevation Method is used which uses the elevation of the snowline to interpolate over the missing data. This method is accurate but is computationally demanding. Using Google Earth Engine, it is attempted to improve the method. The method developed combines grid cells with daily images and computes the RSLE for each cell, for each day. The results are exported to a CSV file, reducing the downloaded data from 150GB to 41.6 MB for the 0.50° resolution and 168MB for the 0.25° resolution. The computation time however was not improved with this method. The developed code was used on the Caucasus area. After the data from Google Earth Engine was downloaded, trends on yearly snow cover duration were computed using the Mann-Kendall test. It followed that 17% of the trends in both resolutions were significant and, except for one location, were all decreasing trends. The decreasing trends show a decline of snow cover duration of 1-4 days per year. Looking at regional differences it becomes clear the greatest number of trends can be found in the south-west. The Google Earth Engine code was able to compute the required data however, it took a long time doing so. Therefore, a more sophisticated code has been developed, making used of the ability to reduce the resolution of an image, and computing the value of pixels at the same time. This code runs quicker, but is at this moment unusable, due to problems with the thresholds and export. Being unable to export an image collection is one of the shortcomings of Google Earth Engine. Others include: download tasks that run out after twelve days without raising an error when starting the task, limits to the amounts of bands used, and sensitivity of the computation time to busyness on servers. Things that need to be improved and need further research are: the filters applied to smoothen the dataset, the use of other trend analyses, the effect of snow cover trends on the area, and the resolution in combination with the cloud threshold value. The analyses took six hours to run, which can be improved by using function-based programming, instead of process-based. In the end the goal to develop a more efficient method has partly been met by decreasing the amount of downloaded data significantly, even though the running time has not been improved. Using the data from the developed method, decreasing trends were found in snow cover duration over the entire Caucasus but mainly in the South-West, which can greatly influence the water supply to a large part of the Caucasus and its surrounding areas.

Civil Engineering | Water Management

Advisors/Committee Members: Hrachowitz, Markus (mentor), Lhermitte, Stef (graduation committee), Steele-Dunne, Susan (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Snow; Google Earth Engine; Caucasus

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APA (6^th Edition):

van Esch, T. (. (2019). Estimating snow cover decline using the RSLE in Google Earth Engine: A Caucasus case study. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:196d467a-f0ae-480d-a3e3-d2da97e821bc

Chicago Manual of Style (16^th Edition):

van Esch, Thijs (author). “Estimating snow cover decline using the RSLE in Google Earth Engine: A Caucasus case study.” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:196d467a-f0ae-480d-a3e3-d2da97e821bc.

MLA Handbook (7^th Edition):

van Esch, Thijs (author). “Estimating snow cover decline using the RSLE in Google Earth Engine: A Caucasus case study.” 2019. Web. 06 Mar 2021.

Vancouver:

van Esch T(. Estimating snow cover decline using the RSLE in Google Earth Engine: A Caucasus case study. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:196d467a-f0ae-480d-a3e3-d2da97e821bc.

Council of Science Editors:

van Esch T(. Estimating snow cover decline using the RSLE in Google Earth Engine: A Caucasus case study. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:196d467a-f0ae-480d-a3e3-d2da97e821bc

Delft University of Technology

18. Kersbergen, Daniël (author). Automated Building Damage Classification using Remotely Sensed Data: Case study: Hurricane Damage on St. Maarten.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:43a82eb1-cc37-48fc-ba39-f6a1375ba3c7

►

In the second half of the 20th and beginning of the 21st century the amount of natural disasters has increased rapidly. Due to this rise… (more)

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In the second half of the 20th and beginning of the 21st century the amount of natural disasters has increased rapidly. Due to this rise in occurrences, more people are affected. An important indicator for people affected is the amount of damage to buildings. To gather this information aid workers now have to go into the field to gather data on the amount of destruction. In response to the possible dangers these people encounter in the field, remote sensing and analysis techniques have been developed for automated damage detection. However, due to various limitations on the implementation, these techniques are not yet widely adopted in emergency response and humanitarian aid. This work compares two methods and two data sources for the detection of building damage. The methods are evaluated on their accuracy and implementability within humanitarian aid in disaster situations. The main methods considered are equalisation of histograms of pre-event and post-event imagery, followed by Univariate Image Differencing; and a convolutional neural network on features withdrawn from post-event imagery, using OpenStreetMap data. Remotely sensed data sources considered are synthetic aperture radar and very high resolution optical imagery. All results are analysed and compared to current standards in damage detection. From the results it can be concluded that more research is required for a practical implementation of deep learning techniques. The constraint posed by the requirement of large datasets, make these methods impracticable without sufficient preparation and resources. More simpler methods, like Univariate Image Differencing, can be validated on smaller ground-truth datasets, and are therefore easier in implementation when resources are limited. The possible accuracy increase of deep learning methods does, at this moment, not outweigh the ease of an elementary differencing approach.

Geomatics

Advisors/Committee Members: Lopes Gil, Jorge (mentor), Lhermitte, Stef (mentor), Giodini, Stefania (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Geomatics; Remote Sensing; Building Damage; Neural Networks; Univariate Image Differencing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kersbergen, D. (. (2018). Automated Building Damage Classification using Remotely Sensed Data: Case study: Hurricane Damage on St. Maarten. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:43a82eb1-cc37-48fc-ba39-f6a1375ba3c7

Chicago Manual of Style (16^th Edition):

Kersbergen, Daniël (author). “Automated Building Damage Classification using Remotely Sensed Data: Case study: Hurricane Damage on St. Maarten.” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:43a82eb1-cc37-48fc-ba39-f6a1375ba3c7.

MLA Handbook (7^th Edition):

Kersbergen, Daniël (author). “Automated Building Damage Classification using Remotely Sensed Data: Case study: Hurricane Damage on St. Maarten.” 2018. Web. 06 Mar 2021.

Vancouver:

Kersbergen D(. Automated Building Damage Classification using Remotely Sensed Data: Case study: Hurricane Damage on St. Maarten. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:43a82eb1-cc37-48fc-ba39-f6a1375ba3c7.

Council of Science Editors:

Kersbergen D(. Automated Building Damage Classification using Remotely Sensed Data: Case study: Hurricane Damage on St. Maarten. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:43a82eb1-cc37-48fc-ba39-f6a1375ba3c7

Delft University of Technology

19. Li, Weiran (author). Detection of subsurface meltwater in East Antarctica using SAR Interferometry.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:783417aa-7e14-4e35-a362-9440ab0b6bc8

►

Climate change has been a heated topic in recent years, and the mass loss of ice sheets is one aspect of it. The Antarctic Ice… (more)

Subjects/Keywords: Remote Sensing; InSAR; Antarctica

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Li, W. (. (2018). Detection of subsurface meltwater in East Antarctica using SAR Interferometry. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:783417aa-7e14-4e35-a362-9440ab0b6bc8

Chicago Manual of Style (16^th Edition):

Li, Weiran (author). “Detection of subsurface meltwater in East Antarctica using SAR Interferometry.” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:783417aa-7e14-4e35-a362-9440ab0b6bc8.

MLA Handbook (7^th Edition):

Li, Weiran (author). “Detection of subsurface meltwater in East Antarctica using SAR Interferometry.” 2018. Web. 06 Mar 2021.

Vancouver:

Li W(. Detection of subsurface meltwater in East Antarctica using SAR Interferometry. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:783417aa-7e14-4e35-a362-9440ab0b6bc8.

Council of Science Editors:

Li W(. Detection of subsurface meltwater in East Antarctica using SAR Interferometry. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:783417aa-7e14-4e35-a362-9440ab0b6bc8

Delft University of Technology

20. Michailidou, Egli (author). Antarctic surface melting dynamics using radar scatterometer data.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:2a1ed71d-589e-474f-912e-2a82f9c6bf35

►

Recent studies have shown that processes like the thinning of the ice shelves, the acceleration of the outlet glaciers and the collapses of the ice… (more)

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Recent studies have shown that processes like the thinning of the ice shelves, the acceleration of the outlet glaciers and the collapses of the ice shelves are connected to surface melting. Several ice shelves at the Antarctic Peninsula, a region that has experienced an atmospheric warming much larger than the global average, have retreated and disappeared. In order to assess the stability of the ice shelves, snowmelt amount can be used. Microwave remote sensing instruments are used in studying surface melting. The presence of liquid water causes a decrease in volumetric scattering that is dominant over absorption in dry snow, and increases absorption due to the increase of the imaginary part of snow permittivity. Thus, active microwave scatterometers can detect melt because of the decrease in backscatter. In this study, data from QuikSCAT (2000-2009) and ASCAT (2010-2016) are used for the investigation of the Antarctic surface melting dynamics for the period 2000-2016. The methodologies of Trusel et al. (2012) and Bothale et al. (2015) and two other threshold-based melt detection methodologies are applied and evaluated using in-situ meteorological records and are compared to passive microwave threshold-based melt duration results from AMSR-E and AMSR2. In addition, an attempt for a retrieval of a consistent melt time series is performed. The results support the use of a dynamic threshold-based melt detection approach for scatterometer data, but it is not possible to achieve consistency in melt duration results from the two scatterometers mainly due to their differences overpass timing. Overall, a high interannual variation in melt extent and melt index is found and results show that the extent of the areas that experience morning and afternoon melt consistently remains constant through the years. However, morning measurements underestimate melt and thus midday observations are important for melt detection studies, as melting varies throughout the day. In addition, although most of the large scale melting phenomena are captured by AMSR-E, the higher sensitivity of QuikSCAT to melt and its finer resolution result in differences in the derived melt metrics.

Civil Engineering

Advisors/Committee Members: Lhermitte, Stef (mentor), Hanssen, Ramon (graduation committee), Bastiaanssen, Wim (graduation committee), Belmonte Rivas, Maria (graduation committee), Lenaerts, J.T.M. (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: surface melting; scatterometers; radiometers; Antarctica

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Michailidou, E. (. (2018). Antarctic surface melting dynamics using radar scatterometer data. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2a1ed71d-589e-474f-912e-2a82f9c6bf35

Chicago Manual of Style (16^th Edition):

Michailidou, Egli (author). “Antarctic surface melting dynamics using radar scatterometer data.” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:2a1ed71d-589e-474f-912e-2a82f9c6bf35.

MLA Handbook (7^th Edition):

Michailidou, Egli (author). “Antarctic surface melting dynamics using radar scatterometer data.” 2018. Web. 06 Mar 2021.

Vancouver:

Michailidou E(. Antarctic surface melting dynamics using radar scatterometer data. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:2a1ed71d-589e-474f-912e-2a82f9c6bf35.

Council of Science Editors:

Michailidou E(. Antarctic surface melting dynamics using radar scatterometer data. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:2a1ed71d-589e-474f-912e-2a82f9c6bf35

Delft University of Technology

21. Beenen, Kathelijne (author). An assessment on field-scale spatial variability of sugarcane yield with satellite derived vegetation indices and evapotranspiration products: A case study on sugarcane fields in Mozambique.

Degree: 2020, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:488e2e5a-86cb-4af6-9f5f-7baf4a498d40

►

Due to increasing global population and increasing food demand, crop yield needs to be improved to forestall potential food shortages. To achieve optimal crop yield,… (more)

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Due to increasing global population and increasing food demand, crop yield needs to be improved to forestall potential food shortages. To achieve optimal crop yield, irrigation is applied to replace water losses due to evapotranspiration (ET). Information on ET should be applied to optimize water allocations and water use. In this study, the correlation between ET and yield will be investigated on field-scale level to assess the potential of high resolution ET products as a tool to detect yield variation. The variability of crop yield and transpiration are caused by the variability in the topography, groundwater and soil properties. Agricultural practices and field-scale water management demand high resolution (in meters) and high temporal resolution (daily to sub-daily) remote sensing products. With the arrival of new satellite platforms, such as Sentinel-2, the aforementioned remote sensing data can be improved significantly in spatial and temporal resolution. In order to compare the functionality of different remote sensing products, an assessment is executed for two satellite derived vegetation indices: normalized difference vegetation index (NDVI) and normalized difference water index (NDWI), and two satellite derived evaporation products: WaPOR (Water Productivity through Open access of Remotely sensed derived data) and a newly developed evaporation algorithm from VanderSat. Within this research, the focus lies on assessing which dataset is able to observe the spatial difference and temporal patterns on field-scale level. Using a large sugarcane plantation in Xinavane, Mozambique, as a case study, we demonstrate how the spatial variability of the remote sensing results are correlated to the sugarcane yield. To assist irrigated agriculture we demonstrate that a high resolution evaporation product is needed to incorporate spatial variability in evaporation estimates. The analysis shows that the high resolution satellite derived vegetation indices are related to the spatial variability of yield. Our results indicate that NDWI has a strong positive correlation of 0.73 with yield, but NDVI has only 0.64. The actual evapotranspiration estimates have a moderately positive correlation with yield of 0.5 for WaPOR and 0.57 for VanderSat. Evaporation estimates should be related to yield to control irrigation properly. WaPOR and VanderSat use NDVI as a input for crop stress, these existing evaporation algorithms should incorporate high resolution spatial imagery as NDWI instead of NDVI to assist irrigation adequately. In order to use the satellite derived evaporation algorithms for agricultural practices and field-scale water management, future research should be focus on improving the relation between satellite derived evaporation algorithms and yield.

Geoscience and Remote Sensing

Advisors/Committee Members: Steele-Dunne, Susan (mentor), Lhermitte, Stef (mentor), Coenders-Gerrits, Miriam (mentor), den Besten, Nadja (mentor), van der Zaag, Pieter (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: evapotranspiration; NDVI; NDWI; irrigation; WaPOR; satellite remote sensing; sugarcane; spatial variability

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Beenen, K. (. (2020). An assessment on field-scale spatial variability of sugarcane yield with satellite derived vegetation indices and evapotranspiration products: A case study on sugarcane fields in Mozambique. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:488e2e5a-86cb-4af6-9f5f-7baf4a498d40

Chicago Manual of Style (16^th Edition):

Beenen, Kathelijne (author). “An assessment on field-scale spatial variability of sugarcane yield with satellite derived vegetation indices and evapotranspiration products: A case study on sugarcane fields in Mozambique.” 2020. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:488e2e5a-86cb-4af6-9f5f-7baf4a498d40.

MLA Handbook (7^th Edition):

Beenen, Kathelijne (author). “An assessment on field-scale spatial variability of sugarcane yield with satellite derived vegetation indices and evapotranspiration products: A case study on sugarcane fields in Mozambique.” 2020. Web. 06 Mar 2021.

Vancouver:

Beenen K(. An assessment on field-scale spatial variability of sugarcane yield with satellite derived vegetation indices and evapotranspiration products: A case study on sugarcane fields in Mozambique. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:488e2e5a-86cb-4af6-9f5f-7baf4a498d40.

Council of Science Editors:

Beenen K(. An assessment on field-scale spatial variability of sugarcane yield with satellite derived vegetation indices and evapotranspiration products: A case study on sugarcane fields in Mozambique. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:488e2e5a-86cb-4af6-9f5f-7baf4a498d40

Delft University of Technology

22. Scherpenisse, Brendan (author). Detection of multi-transitional abrupt changes in SAR time series.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:8266b17f-7383-4fa3-a0e6-77d0f31abc0d

►

Repeat-pass acquisitions with coherent Synthetic Aperture Radar (SAR) systems, preserving both phase and amplitude, are more readily available than ever (Bruzzone, 2016). Phase measurements from… (more)

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Repeat-pass acquisitions with coherent Synthetic Aperture Radar (SAR) systems, preserving both phase and amplitude, are more readily available than ever (Bruzzone, 2016). Phase measurements from SAR systems have seen widespread use in the Interferometric Synthetic Aperture (InSAR) technique to measure deformations and elevations since the late 1980’s (Hanssen, 2002). Since the late 1990’s an increase in radar-based change detection is observed, mainly relying on amplitude measurements (Ajadi et al., 2016; Dekker, 1998). The unpredictive multiplicative noise-like speckle, inherent to coherent SAR,makes change detection in SAR imagery difficult (Bamler, 2015). However, the advantages in the all-weather mapping capabilities and object penetrating properties of SAR make it a suitable remote sensing technique for certain applications, such as natural disaster damage assessment (Bruzzone and Prieto, 2000). Broadly speaking, change detection in SAR-based images usually consists of applying an operator on two spatially filtered SAR images to create a difference image (DI), which is then analysed for change points by thresholding and/or clustering (e.g. Alphonse and Biju, 2015). However, such an approach completely neglects the long-term stability of a pixel. When taking the temporal evolution of a pixel into account, the steep increase in data volume puts an emphasis on finding an optimal (’best practice’) approach to the multitemporal change point detection problem. Here it is shown that change point detection methods that properly take the temporal evolution of a pixel into account can provide good segmentation results in multi-temporal SAR data stacks, even in unfiltered stacks that preserve the complete spatial resolution and without considering the spatial context in a pixel’s direct neighbourhood. Moreover, it is found thatmore sophisticated change point detection algorithms don’t necessarily yield superior segmentation results for various discontinuity functions. This means algorithm selection has to be application driven. The results demonstrate that the suitability of algebraic methods in heterogeneous areas is limited, whereas proper time series analysis yields fairly consistent results over different land covers within the same image. Often, little effort is spend on finding an optimal approach; neglecting data selection and storage, a sensitivity analysis and/or the post-processing analysis procedure, all of which are shown or known to increase the success rate, efficiency and understanding of the segmentation results. It is anticipated that change point detection in SAR imagery will shift away from the classical bi-temporal methodology and multi temporal approaches will become the norm, be it by decomposing multi-temporal stacks or time series analysis.

Geoscience and Remote Sensing

Advisors/Committee Members: Hanssen, Ramon (graduation committee), van Leijen, Freek (graduation committee), Lhermitte, Stef (graduation committee), ten Veldhuis, Marie-claire (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: radar; SAR; change detection

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APA (6^th Edition):

Scherpenisse, B. (. (2018). Detection of multi-transitional abrupt changes in SAR time series. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8266b17f-7383-4fa3-a0e6-77d0f31abc0d

Chicago Manual of Style (16^th Edition):

Scherpenisse, Brendan (author). “Detection of multi-transitional abrupt changes in SAR time series.” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:8266b17f-7383-4fa3-a0e6-77d0f31abc0d.

MLA Handbook (7^th Edition):

Scherpenisse, Brendan (author). “Detection of multi-transitional abrupt changes in SAR time series.” 2018. Web. 06 Mar 2021.

Vancouver:

Scherpenisse B(. Detection of multi-transitional abrupt changes in SAR time series. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:8266b17f-7383-4fa3-a0e6-77d0f31abc0d.

Council of Science Editors:

Scherpenisse B(. Detection of multi-transitional abrupt changes in SAR time series. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:8266b17f-7383-4fa3-a0e6-77d0f31abc0d

Delft University of Technology

23. Voordendag, Annelies (author). Sensitivity of snow models in the semi-arid Andes of Chile: A comparison between SNOWPACK and SnowModel.

Degree: 2018, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:6f8e3f37-b1d0-4233-8068-0f6cfbcedf92

Subjects/Keywords: snow; modelling; Andes; SNOWPACK; SnowModel; sensitivity analysis; Chile

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APA (6^th Edition):

Voordendag, A. (. (2018). Sensitivity of snow models in the semi-arid Andes of Chile: A comparison between SNOWPACK and SnowModel. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:6f8e3f37-b1d0-4233-8068-0f6cfbcedf92

Chicago Manual of Style (16^th Edition):

Voordendag, Annelies (author). “Sensitivity of snow models in the semi-arid Andes of Chile: A comparison between SNOWPACK and SnowModel.” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021. http://resolver.tudelft.nl/uuid:6f8e3f37-b1d0-4233-8068-0f6cfbcedf92.

MLA Handbook (7^th Edition):

Voordendag, Annelies (author). “Sensitivity of snow models in the semi-arid Andes of Chile: A comparison between SNOWPACK and SnowModel.” 2018. Web. 06 Mar 2021.

Vancouver:

Voordendag A(. Sensitivity of snow models in the semi-arid Andes of Chile: A comparison between SNOWPACK and SnowModel. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06]. Available from: http://resolver.tudelft.nl/uuid:6f8e3f37-b1d0-4233-8068-0f6cfbcedf92.

Council of Science Editors:

Voordendag A(. Sensitivity of snow models in the semi-arid Andes of Chile: A comparison between SNOWPACK and SnowModel. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:6f8e3f37-b1d0-4233-8068-0f6cfbcedf92

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