Open Access Theses and Dissertations

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Delft University of Technology

1. Rozendaal, Marco (author). An Idealised Morphodynamic Model of a Tidal Inlet and the Adjacent Sea.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:edc2ffd6-00fd-4cd6-883b-13b14528cb72 

Tidal inlet systems are often highly valuable and sometimes even unique ecosystems. However, field measurements show that tidal inlet systems are sensitive to changing exogenous conditions, such as rising sea levels. This thesis aims to investigate to what extent the adjacent sea influences the stability and equilibrium state of the tidal inlet. A one-dimensional idealised model is used to model the interaction between the sea and the inlet. The water motion is forced by the tide and the inlet is assumed to be narrow and short. At equilibrium, an increasingly sloping bottom is found in the sea and a constantly sloping bottom in the inlet. This equilibrium bottom profile seems to be in reasonable agreement with observations. The sea-inlet bottom profile is less stable than the inlet bottom profile, nevertheless, the sea-inlet bottom profile is still asymptotically linear stable. Moreover, the results in this thesis suggest that for one-dimensional idealised models consisting solely of a tidal inlet, the correct seaward boundary condition is a properly chosen fixed entrance depth. For a two-dimensional semi-infinite sea, it is shown that a Perfectly Matched Layer is a convenient method to incorporate the Sommerfeld radiation condition and that the narrow tidal inlet cannot be modelled as a point source forcing in the two-dimensional sea domain.

Applied Mathematics

Advisors/Committee Members: Schuttelaars, Henk (mentor), Dubbeldam, Johan (graduation committee), Möller, Matthias (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Morphodynamic model; Idealised model; Tidal inlet system; Tidal embayment; Morphodynamic equilibrium; Equilibrium bed profiles; Stability analysis

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

APA (6th Edition):

Rozendaal, M. (. (2019). An Idealised Morphodynamic Model of a Tidal Inlet and the Adjacent Sea. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:edc2ffd6-00fd-4cd6-883b-13b14528cb72

Chicago Manual of Style (16th Edition):

Rozendaal, Marco (author). “An Idealised Morphodynamic Model of a Tidal Inlet and the Adjacent Sea.” 2019. Masters Thesis, Delft University of Technology. Accessed January 16, 2021. http://resolver.tudelft.nl/uuid:edc2ffd6-00fd-4cd6-883b-13b14528cb72.

MLA Handbook (7th Edition):

Rozendaal, Marco (author). “An Idealised Morphodynamic Model of a Tidal Inlet and the Adjacent Sea.” 2019. Web. 16 Jan 2021.

Vancouver:

Rozendaal M(. An Idealised Morphodynamic Model of a Tidal Inlet and the Adjacent Sea. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Jan 16]. Available from: http://resolver.tudelft.nl/uuid:edc2ffd6-00fd-4cd6-883b-13b14528cb72.

Council of Science Editors:

Rozendaal M(. An Idealised Morphodynamic Model of a Tidal Inlet and the Adjacent Sea. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:edc2ffd6-00fd-4cd6-883b-13b14528cb72

2. Liu, B. Modelling Phytoplankton Dynamics in Estuaries.

Degree: 2017, University Utrecht

URL: https://dspace.library.uu.nl/handle/1874/354243  ; URN:NBN:NL:UI:10-1874-354243 ; 1874/354243 ; urn:isbn:9789462996717 ; URN:NBN:NL:UI:10-1874-354243 ; https://dspace.library.uu.nl/handle/1874/354243 

In estuaries, which are the transition areas between rivers and coastal waters, the spatial and temporal distribution of phytoplankton cell number density (P) is determined by local specific growth and loss, advection by currents, mixing by turbulence, and sinking if the density of phytoplankton is larger than that of the surrounding water. This thesis discusses the spatiotemporal dynamics of P under different estuarine abiotic conditions. Inspired by field observations, four key issues were addressed, that is, the impact of river discharge, the spatial distribution of suspended particulate material (SPM), seasonal variability of incident light intensity and water temperature, and salinity stratification on P patterns. For this, an idealised model was developed and its output was systematically analysed. The main features of the observed phytoplankton bloom that locates in the middle reach of the Taw estuary (a vertically well-mixed estuary with a low turbidity level) were captured by the model. The specific spatial pattern of the bloom emerges due to the advection of phytoplankton by large river flow in the narrow upper reach and due to the nutrient-limited phytoplankton growth in the wide lower reach. A sensitivity study to river discharge revealed the presence of three regimes, which are characterized by different ratios of net specific growth rate to flushing rate. The Ems estuary (between the Netherlands and Germany) was taken as an example for vertically well-mixed estuaries with a pronounced turbidity zone. The model captured the key features of the observed blooms in this estuary, i.e., in the lower reach a spring bloom occurs, which is followed by a secondary bloom in autumn. Analysis of model results showed that the along-estuary distribution of turbidity determines the along-estuary location of blooms and it largely affects the intensity of blooms by controlling the distance between bloom locations and the river head, where nutrients enter the estuary. In estuaries such as the Columbia River estuary (western US), the degree of vertical salinity stratification and the spatial distribution of phytoplankton cell number density P differ substantially between spring and neap tides. The model captured the main features of the observed P patterns in this estuary, that is, during weak stratification (spring tides) P is almost vertically uniform with values decreasing towards the estuary mouth, whereas during strong stratification (neap tides) high values of P occur in the upper layer and extend seawards. Sensitivity experiments showed that the advection of P by subtidal currents is important in obtaining a smaller along-estuary gradient of P during weak stratification and in obtaining a smaller horizontal gradient and a larger vertical gradient of P during strong stratification. Accounting for stratification controlled vertical distribution of vertical eddy viscosity and eddy diffusivity is necessary for obtaining realistic P patterns if stratification is strong, but not if stratification is weak. A higher loss… Advisors/Committee Members: de Swart, Huib.

Subjects/Keywords: phytoplankton; estuary; idealised model; well-mixed; river discharge; SPM; salinity stratification

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

APA (6th Edition):

Liu, B. (2017). Modelling Phytoplankton Dynamics in Estuaries. (Doctoral Dissertation). University Utrecht. Retrieved from https://dspace.library.uu.nl/handle/1874/354243 ; URN:NBN:NL:UI:10-1874-354243 ; 1874/354243 ; urn:isbn:9789462996717 ; URN:NBN:NL:UI:10-1874-354243 ; https://dspace.library.uu.nl/handle/1874/354243

Chicago Manual of Style (16th Edition):

Liu, B. “Modelling Phytoplankton Dynamics in Estuaries.” 2017. Doctoral Dissertation, University Utrecht. Accessed January 16, 2021. https://dspace.library.uu.nl/handle/1874/354243 ; URN:NBN:NL:UI:10-1874-354243 ; 1874/354243 ; urn:isbn:9789462996717 ; URN:NBN:NL:UI:10-1874-354243 ; https://dspace.library.uu.nl/handle/1874/354243.

MLA Handbook (7th Edition):

Liu, B. “Modelling Phytoplankton Dynamics in Estuaries.” 2017. Web. 16 Jan 2021.

Vancouver:

Liu B. Modelling Phytoplankton Dynamics in Estuaries. [Internet] [Doctoral dissertation]. University Utrecht; 2017. [cited 2021 Jan 16]. Available from: https://dspace.library.uu.nl/handle/1874/354243 ; URN:NBN:NL:UI:10-1874-354243 ; 1874/354243 ; urn:isbn:9789462996717 ; URN:NBN:NL:UI:10-1874-354243 ; https://dspace.library.uu.nl/handle/1874/354243.

Council of Science Editors:

Liu B. Modelling Phytoplankton Dynamics in Estuaries. [Doctoral Dissertation]. University Utrecht; 2017. Available from: https://dspace.library.uu.nl/handle/1874/354243 ; URN:NBN:NL:UI:10-1874-354243 ; 1874/354243 ; urn:isbn:9789462996717 ; URN:NBN:NL:UI:10-1874-354243 ; https://dspace.library.uu.nl/handle/1874/354243


University of Queensland

3. Kloetzke, Thomas. Simulation and analysis of surface wind fields during landfalling tropical cyclones.

Degree: School of Civil Engineering, 2019, University of Queensland

URL: http://espace.library.uq.edu.au/view/UQ:9 

Subjects/Keywords: Wind; Tropical cyclones; Tropical cyclone boundary layer; Near-surface wind field; Turbulence; Surface roughness; Terrain changes; Field campaigns; WRF model; Idealised TC simulations; 0401 Atmospheric Sciences; 0915 Interdisciplinary Engineering

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

APA (6th Edition):

Kloetzke, T. (2019). Simulation and analysis of surface wind fields during landfalling tropical cyclones. (Thesis). University of Queensland. Retrieved from http://espace.library.uq.edu.au/view/UQ:9

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

Chicago Manual of Style (16th Edition):

Kloetzke, Thomas. “Simulation and analysis of surface wind fields during landfalling tropical cyclones.” 2019. Thesis, University of Queensland. Accessed January 16, 2021. http://espace.library.uq.edu.au/view/UQ:9.

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

MLA Handbook (7th Edition):

Kloetzke, Thomas. “Simulation and analysis of surface wind fields during landfalling tropical cyclones.” 2019. Web. 16 Jan 2021.

Vancouver:

Kloetzke T. Simulation and analysis of surface wind fields during landfalling tropical cyclones. [Internet] [Thesis]. University of Queensland; 2019. [cited 2021 Jan 16]. Available from: http://espace.library.uq.edu.au/view/UQ:9.

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

Council of Science Editors:

Kloetzke T. Simulation and analysis of surface wind fields during landfalling tropical cyclones. [Thesis]. University of Queensland; 2019. Available from: http://espace.library.uq.edu.au/view/UQ:9

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

.