Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for +publisher:"Delft University of Technology" +contributor:("van Vuren, Saskia"). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Delft University of Technology

1. Hiemstra, Koen (author). Development of a methodology to assess functional performance of the Dutch Rhine: A case study on the impact of autonomous trends and sediment management strategies.

Degree: 2019, Delft University of Technology

The summer and autumn of 2018 showed the negative effects of both low-flow conditions and bed degradation over the last century on the river functions of the Dutch Rhine. These resulted in record-breaking water levels, extreme low navigation depth and subsequently nautical problems. As climate change will increase the inter-annual variability of the Rhine’s discharge pattern, low-flow conditions are likely to occur more often, reinforcing the above-mentioned impacts on nature and navigation. Sediment management is considered as a sustainable way to counteract the bed degradation. To justify an investment in a large scale nourishment, the impact of a nourishment on the river functions has to be compared with the result of a reference situation without nourishment. This study aims to develop a methodology that evaluates the future performance of rivers functions accounting for the autonomous trends (bed level and climate changes) and provides insights in the functional performance and cost effectiveness of river interventions. The methodology enables the assessment of the impact of the trends on the river system without intervention. It appears that the navigational efficiency is decreased enormously by climate change en bed erosion, which will increase transportation costs. Based on these indicative analysis a nourishment is predicted to be cost effective by improving both the navigational efficiency and counteracting dehydration of the floodplains.

Hydraulic Engineering

Advisors/Committee Members: Kok, Matthijs (mentor), Jorissen, Richard (mentor), van Vuren, Saskia (mentor), Vinke, Frederik (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: bed degradation; climate change; integrated river management; navigation; nature; flood protection

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Hiemstra, K. (. (2019). Development of a methodology to assess functional performance of the Dutch Rhine: A case study on the impact of autonomous trends and sediment management strategies. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:eb662158-7387-41d4-93a7-3184e94480d6

Chicago Manual of Style (16th Edition):

Hiemstra, Koen (author). “Development of a methodology to assess functional performance of the Dutch Rhine: A case study on the impact of autonomous trends and sediment management strategies.” 2019. Masters Thesis, Delft University of Technology. Accessed September 26, 2020. http://resolver.tudelft.nl/uuid:eb662158-7387-41d4-93a7-3184e94480d6.

MLA Handbook (7th Edition):

Hiemstra, Koen (author). “Development of a methodology to assess functional performance of the Dutch Rhine: A case study on the impact of autonomous trends and sediment management strategies.” 2019. Web. 26 Sep 2020.

Vancouver:

Hiemstra K(. Development of a methodology to assess functional performance of the Dutch Rhine: A case study on the impact of autonomous trends and sediment management strategies. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2020 Sep 26]. Available from: http://resolver.tudelft.nl/uuid:eb662158-7387-41d4-93a7-3184e94480d6.

Council of Science Editors:

Hiemstra K(. Development of a methodology to assess functional performance of the Dutch Rhine: A case study on the impact of autonomous trends and sediment management strategies. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:eb662158-7387-41d4-93a7-3184e94480d6


Delft University of Technology

2. van Tilburg, Inez (author). Risk-based vegetation maintenance in regional water systems.

Degree: 2018, Delft University of Technology

Regional water systems are being controlled to prevent flood events by different measures, such as water storage, weir management and vegetation maintenance. Vegetation maintenance has a significant effect on flood risk, because the hydraulic roughness decreases after cutting of vegetation. Stream restoration is a project in regional water systems, where floodplains are constructed and weirs are removed to recover the ecological value of streams. In streams with floodplains the vegetation is relatively more important because of smaller water depth. Moreover, climate change increases the flood risk, which increases the urgency to investigate the vegetation maintenance strategy. A vegetation maintenance strategy involves of a cutting frequency, how often and when the vegetation is cut, and a cutting intensity, the percentage of the cross-section that is cut. The aim of this research is to optimize the performance of the vegetation maintenance strategy by consideration of the aspects ‘flood risk’, ‘ecological effects’ and ‘maintenance costs’. The research answers the following question: How can risk-based vegetation maintenance strategy reduce flood risk in a cost-effective way in regional water systems with consideration of ecological effects? A case study, a recently flooded stream in the south of the Netherlands, is used to answer the research question. The performances of nine selected vegetation maintenance strategies are investigated. Dimensionless performance indicators are designed for the three aspects to assess the total performance of each vegetation maintenance strategy. For the aspect ‘maintenance costs’, data from a water board is retrieved and the aspect ‘ecological effects’ is assessed by a literature study. For the aspect ‘flood risk’, several steps are conducted. The vegetation maintenance strategy is translated into a probability distribution function of roughness coefficients. To that end, use is made of roughness functions including vegetation growth curves and roughness coefficients of the stream. Stochastic modelling of the water level by the hydraulic model Sobek 1D is used to examine the influence of vegetation maintenance on the water levels. A consequence model, the Water Damage Estimator, translates the results of the stochastic modelling step into flood risk. The three performances of the aspects are combined into the total performance of the vegetation maintenance strategy. The results of the case study show that the timing of cutting has the largest influence on the flood risk, followed by the cutting frequency. The cutting intensity has the smallest influence on the flood risk. For a high performance of ‘maintenance costs’, a low cutting frequency is necessary. For a high ecological value, pattern cutting and cutting in August is important. In conclusion, for streams with floodplains the optimal vegetation maintenance strategy is ‘cutting of the main channel and parts of the floodplains before summer’. The total performance of the vegetation maintenance… Advisors/Committee Members: van Vuren, Saskia (mentor), Kok, Matthijs (graduation committee), Schoups, Gerrit (graduation committee), Groot, Susanne (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: vegetation maintenance; regional water system; performance indicator; Stochastic modelling; ecological effects

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

van Tilburg, I. (. (2018). Risk-based vegetation maintenance in regional water systems. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f836e9a6-db21-4451-b729-458b55f63b72

Chicago Manual of Style (16th Edition):

van Tilburg, Inez (author). “Risk-based vegetation maintenance in regional water systems.” 2018. Masters Thesis, Delft University of Technology. Accessed September 26, 2020. http://resolver.tudelft.nl/uuid:f836e9a6-db21-4451-b729-458b55f63b72.

MLA Handbook (7th Edition):

van Tilburg, Inez (author). “Risk-based vegetation maintenance in regional water systems.” 2018. Web. 26 Sep 2020.

Vancouver:

van Tilburg I(. Risk-based vegetation maintenance in regional water systems. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2020 Sep 26]. Available from: http://resolver.tudelft.nl/uuid:f836e9a6-db21-4451-b729-458b55f63b72.

Council of Science Editors:

van Tilburg I(. Risk-based vegetation maintenance in regional water systems. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:f836e9a6-db21-4451-b729-458b55f63b72


Delft University of Technology

3. Koevoets, Igor (author). Scour holes: A data-driven risk-based analysis for scour holes in the Rhine-Meuse Delta.

Degree: 2019, Delft University of Technology

In the Rhine-Meuse Delta over 100 scour holes are located. Many of these scour holes have dynamic behaviour and are growing in size and depth. A scour hole can lead to an increased probability of flooding. One of the potential hazards of the presence of scour holes is the occurrence of flow slides on the foreshore next to scour holes. Depending on the distance between the dike and the river, a flow slide can affect the water-retaining function of a dike. Flow slide is an indirect failure mechanism and can be used as a scenario in the safety assessment of direct failure mechanisms. In the research, a data-driven method has been developed for the risk assessment of scour holes. The method is elaborated for flooding due to the failure mechanism overtopping. The development of a scour hole is coupled with the safety assessment regarding overtopping for the dike next to a scour hole. In the method, the development of a scour hole and the future dimensions are predicted in a probabilistic way by extrapolation of historically measured bed level data. With the predicted future scour hole dimensions, the probability of occurrence of a flow slide and the probability of several post flow slide profiles is calculated with the methods given in the Wettelijk Beoordelingsinstrumentarium (WBI). Based on the post flow slide profiles, the probability of exceeding the critical overtopping discharge is determined. Combining the probability of exceedance of the critical overtopping discharge with the consequences of a flood gives the flood risk due to the presence of a scour hole. The developed data-driven method is applied to one case study, a scour hole in the river Spui. For this particular scour hole, the flood risk is assessed. A prediction is made for the future dimensions of the scour hole. The flood risk is determined with the probability of occurrence of flow slide, the probability of exceedance of the critical overtopping discharge and the expected consequences of a flood. The assessed flood risk is evaluated and risk mitigation measures are proposed. The economic feasibility of risk mitigation measures is analysed with a cost-benefit analysis.

Hydraulic Engineering

Advisors/Committee Members: Kok, Matthijs (graduation committee), van Vuren, Saskia (graduation committee), Pol, Joost (graduation committee), Neefjes, P. (mentor), Stenfert, Joost (mentor), Delft University of Technology (degree granting institution).

Subjects/Keywords: Scour hole; Floodrisk; risk-based approach; Rhine-Meuse Delta; Flow slide

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Koevoets, I. (. (2019). Scour holes: A data-driven risk-based analysis for scour holes in the Rhine-Meuse Delta. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d4245867-c1e4-4f64-80b5-21a4e34647a8

Chicago Manual of Style (16th Edition):

Koevoets, Igor (author). “Scour holes: A data-driven risk-based analysis for scour holes in the Rhine-Meuse Delta.” 2019. Masters Thesis, Delft University of Technology. Accessed September 26, 2020. http://resolver.tudelft.nl/uuid:d4245867-c1e4-4f64-80b5-21a4e34647a8.

MLA Handbook (7th Edition):

Koevoets, Igor (author). “Scour holes: A data-driven risk-based analysis for scour holes in the Rhine-Meuse Delta.” 2019. Web. 26 Sep 2020.

Vancouver:

Koevoets I(. Scour holes: A data-driven risk-based analysis for scour holes in the Rhine-Meuse Delta. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2020 Sep 26]. Available from: http://resolver.tudelft.nl/uuid:d4245867-c1e4-4f64-80b5-21a4e34647a8.

Council of Science Editors:

Koevoets I(. Scour holes: A data-driven risk-based analysis for scour holes in the Rhine-Meuse Delta. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:d4245867-c1e4-4f64-80b5-21a4e34647a8

.