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You searched for subject:(morphodynamic modelling). Showing records 1 – 3 of 3 total matches.

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1. van Denderen, Robert Pepijn. Side channel dynamics.

Degree: 2019, University of Twente

Side channels are commonly constructed to increase the discharge capacity of a river during peak flow conditions or to increase the ecological value of the river. Observations show that large aggradation occurs in the side channels. Therefore, such channels require regular and costly maintenance. The aim of this research is to better understand the mechanisms that drive the morphodynamic development of side channels and thereby, improve the design of side channels and reduce their maintenance needs. We studied the development of side channel in various ways and found that mechanisms such as a length difference between the downstream channels, sediment sorting at the bifurcation and varying hydrodynamic conditions have a large effect on the morphodynamic development of a side channel system. The mechanisms that are important are not the same for each side channel and can vary in time. Therefore, we propose three categories of side channel based on how the sediment that is deposited in the side channel is transported in the main channel: (1) bed load supplied, (2) suspended bed-material load supplied and (3) wash load supplied side channels. These categories can help in determining the main mechanisms that affect the development of a side channel system. In addition, we propose a method based on the categorization that can aid the design, operation and maintenance of side channels. Advisors/Committee Members: Hulscher, Suzanne J.M.H., Schielen, Ralph Mathias Johannes, Marine and Fluvial Systems.

Subjects/Keywords: Side channel; Bifurcation; Morphodynamic modelling; River morphodynamics; Bifurcation sediment sorting; Floodplain sedimentation

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

APA (6th Edition):

van Denderen, R. P. (2019). Side channel dynamics. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; 972ad003-f084-4ac3-84a0-cf33e150c32c ; 10.3990/1.9789036547437 ; urn:isbn:978-90-365-4743-7 ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html

Chicago Manual of Style (16th Edition):

van Denderen, Robert Pepijn. “Side channel dynamics.” 2019. Doctoral Dissertation, University of Twente. Accessed October 31, 2020. https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; 972ad003-f084-4ac3-84a0-cf33e150c32c ; 10.3990/1.9789036547437 ; urn:isbn:978-90-365-4743-7 ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html.

MLA Handbook (7th Edition):

van Denderen, Robert Pepijn. “Side channel dynamics.” 2019. Web. 31 Oct 2020.

Vancouver:

van Denderen RP. Side channel dynamics. [Internet] [Doctoral dissertation]. University of Twente; 2019. [cited 2020 Oct 31]. Available from: https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; 972ad003-f084-4ac3-84a0-cf33e150c32c ; 10.3990/1.9789036547437 ; urn:isbn:978-90-365-4743-7 ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html.

Council of Science Editors:

van Denderen RP. Side channel dynamics. [Doctoral Dissertation]. University of Twente; 2019. Available from: https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; 972ad003-f084-4ac3-84a0-cf33e150c32c ; 10.3990/1.9789036547437 ; urn:isbn:978-90-365-4743-7 ; urn:nbn:nl:ui:28-972ad003-f084-4ac3-84a0-cf33e150c32c ; https://research.utwente.nl/en/publications/side-channel-dynamics(972ad003-f084-4ac3-84a0-cf33e150c32c).html

2. Latapy, Alexa. Influence des modifications morphologiques de l'avant-côte sur l'hydrodynamisme et l'évolution du littoral des Hauts-de-France depuis le XIXe siècle : Influence of nearshore morphological changes on hydrodynamic and evolution of the Hauts-de-France coastal zone since the 19th century.

Degree: Docteur es, Sciences de la Terre, de l'Univers et de l'Espace. Terre et Enveloppes fluides, 2020, Littoral

Dans les environnements côtiers, les interactions entre les processus morphodynamiques, océanographiques et anthropiques (agissant sur différentes échelles de temps) contrôlent l'évolution des systèmes littoraux. Cette thèse est axée sur une échelle de temps séculaire afin de déterminer l'influence non seulement des activités humaines, mais aussi l'impact du changement climatique. Le long de la côte nord de la France, des mesures de niveau d'eau ont été effectuées depuis le début du 19ème siècle et conservées dans les archives du Service Hydrographique et Océanographique de la Marine (Shom). Parrallèlement à ces mesures tidales, des levés hydrographiques ont été effectués pour cartographier les fonds marins de cette zone côtière, caractérisée par la présence de nombreux bancs sableux, formant des corps sédimentaires massifs parallèles à subparallèles au rivage. Pour déterminer les tendances à long terme, la numérisation et l'analyse des documents historiques ont été réalisées. Ceci a permis de reconstituer les variations du niveau de la mer à Dunkerque et Calais, et d'évaluer les changements de la morphologie et de la position des bancs sableux. A partir de ces séries inédites, l'étude de l'évolution des niveaux marins moyens et des composantes de marée a révélé des changements significatifs. De plus, l'évolution bathymétrique a montré des variations morphologiques importantes depuis le 19ème siècle, qui sont en grande partie dues à la mobilité des bancs sableux. Afin d'étudier l'influence des changements morphologiques sur les processus hydrodynamiques, une modélisation numérique de la propagation de la houle et de la circulation tidale a été réalisée à l'aide de module de la chaîne de calcul TELEMAC. Dans un contexte d'érosion sédimentaire, une accélération des courants et une augmentation de la hauteur des vagues le long du rivage sont détectées. Inversement, dans un contexte d'accumulation sédimentaire, nos résultats mettent en évidence une diminution de la vitesse des courants et une plus grande dissipation de l'énergie des vagues dans les petits-fonds. Cette étude souligne le rôle des rétroactions morphologiques entre l'hydrodynamique côtière et la morphologie du littoral. L'identification de ces mécanismes à une échelle de temps séculaire est essentielle pour évaluer les facteurs potentiels des changements côtiers.

In coastal environment, interactions between morphodynamic, oceanographic and anthropic processes (acting over different timescales) control coastal systems evolution. This thesis is focused on long-term trends to determine the influence not only of human activities, but also the impact of climate change. Along the Northern coast of France, water level measurements were carried out since the early 19th century and tidal records were stored in the French Hydrographic Service (Shom) archives. At the same time that these measurements were conducted, hydrographic surveys were made for mapping the seabed of the coastal zone where tidal sand banks are common, forming linear shore-parallel or slightly…

Advisors/Committee Members: Héquette, Arnaud (thesis director), Pouvreau, Nicolas (thesis director), Weber, Nicolas (thesis director).

Subjects/Keywords: Bathymétries historiques; Niveau marin; Modélisation hydrodynamique; Morphodynamique; Bancs sableux tidaux; Mer du Nord; Manche; Hauts-de-France; Historical bathymetries; Sea-level; Hydrodynamic modelling; Morphodynamic; Tidal sands banks; North Sea; English Channel; Hauts-de-France

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

APA (6th Edition):

Latapy, A. (2020). Influence des modifications morphologiques de l'avant-côte sur l'hydrodynamisme et l'évolution du littoral des Hauts-de-France depuis le XIXe siècle : Influence of nearshore morphological changes on hydrodynamic and evolution of the Hauts-de-France coastal zone since the 19th century. (Doctoral Dissertation). Littoral. Retrieved from http://www.theses.fr/2020DUNK0554

Chicago Manual of Style (16th Edition):

Latapy, Alexa. “Influence des modifications morphologiques de l'avant-côte sur l'hydrodynamisme et l'évolution du littoral des Hauts-de-France depuis le XIXe siècle : Influence of nearshore morphological changes on hydrodynamic and evolution of the Hauts-de-France coastal zone since the 19th century.” 2020. Doctoral Dissertation, Littoral. Accessed October 31, 2020. http://www.theses.fr/2020DUNK0554.

MLA Handbook (7th Edition):

Latapy, Alexa. “Influence des modifications morphologiques de l'avant-côte sur l'hydrodynamisme et l'évolution du littoral des Hauts-de-France depuis le XIXe siècle : Influence of nearshore morphological changes on hydrodynamic and evolution of the Hauts-de-France coastal zone since the 19th century.” 2020. Web. 31 Oct 2020.

Vancouver:

Latapy A. Influence des modifications morphologiques de l'avant-côte sur l'hydrodynamisme et l'évolution du littoral des Hauts-de-France depuis le XIXe siècle : Influence of nearshore morphological changes on hydrodynamic and evolution of the Hauts-de-France coastal zone since the 19th century. [Internet] [Doctoral dissertation]. Littoral; 2020. [cited 2020 Oct 31]. Available from: http://www.theses.fr/2020DUNK0554.

Council of Science Editors:

Latapy A. Influence des modifications morphologiques de l'avant-côte sur l'hydrodynamisme et l'évolution du littoral des Hauts-de-France depuis le XIXe siècle : Influence of nearshore morphological changes on hydrodynamic and evolution of the Hauts-de-France coastal zone since the 19th century. [Doctoral Dissertation]. Littoral; 2020. Available from: http://www.theses.fr/2020DUNK0554


Delft University of Technology

3. Bosboom, J. Quantifying the quality of coastal morphological predictions.

Degree: 2020, Delft University of Technology

<p class="MsoNormal" style="mso-pagination:none;mso-layout-grid-align:none; text-autospace:none">This thesis investigates the behaviour of the often used point-wise skill score, the MSESSini a.k.a. BSS, and develops new error metrics that, as opposed to point-wise metrics, take the spatial structure of morphological patterns into account. The MSESSini measures the relative accuracy of a morphological prediction over a prediction of zero morphological change, using the mean-squared error (MSE) as the accuracy measure. The main findings about the MSESSini are: 1) a generic ranking, based on values for MSESSini, has limited validity, since the zero change reference model fails to make model performance comparable across different prediction situations; 2) the combination of larger, persistent and smaller, intermittent scales of cumulative change may lead to an increase of skill with time, without the prediction on either of these scales becoming more skilful with time; 3) in the presence of inevitable location errors, the MSESSini favours predictions that underestimate the variance of cumulative bed changes and 4) existing methods to correct for measurement error are inconsistent in either their skill formulation or their suggested classification scheme. In order to overcome the inherent limitations of point-wise metrics, three novel diagnostic tools for the spatial validation of 2D morphological predictions are developed. First, a field deformation or warping method deforms the predictions towards the observations, minimizing the squared point-wise error. Error measures are formulated based on both the smooth displacement field between predictions and observations and the residual point-wise error field after the deformation. In contrast with the RMSE, the method captures the visual closeness of morphological patterns. Second, an optimal transport method defines the distance between predicted and observed morphological fields in terms of an optimal sediment transport field. The optimal corrective transport field moves the misplaced sediment from the predicted to the observed morphology at the lowest quadratic transportation cost. The root-mean-squared value of the optimal transport field, the RMSTE, is proposed as a new error metric. As opposed to the field deformation method, the optimal transport method is mass-conserving, parameter-free and symmetric. The RMSTE, unlike the RMSE, is able to discriminate between predictions that differ in the misplacement distance of predicted morphological features. It also avoids the consistent reward of the underestimation of morphological variability that the RMSE is prone to. Third, a scale-selective validation approach allows any metric to selectively address multiple spatial scales. It employs a smoothing filter in such a way that, in addition to the domain-averaged statistics, localized validation statistics and maps of prediction quality are obtained per scale (geographic extent or areal size of focus). The employed skill score weights how well the morphological structure and… Advisors/Committee Members: Reniers, A.J.H.M., Stive, M.J.F., Delft University of Technology.

Subjects/Keywords: (root)-mean-squared error; model accuracy; morphodynamic modelling; model validation; optimal transport; Monge–Kantorovich; root-mean-squared transport error; effective transport difference; image warping; image matching; scale-selective validation; optical flow; Brier skill score; model skill; zero change model; measurement error; location error; pattern skill

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

APA (6th Edition):

Bosboom, J. (2020). Quantifying the quality of coastal morphological predictions. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; 10.4233/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:isbn:978-94-6384-091-0 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3

Chicago Manual of Style (16th Edition):

Bosboom, J. “Quantifying the quality of coastal morphological predictions.” 2020. Doctoral Dissertation, Delft University of Technology. Accessed October 31, 2020. http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; 10.4233/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:isbn:978-94-6384-091-0 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3.

MLA Handbook (7th Edition):

Bosboom, J. “Quantifying the quality of coastal morphological predictions.” 2020. Web. 31 Oct 2020.

Vancouver:

Bosboom J. Quantifying the quality of coastal morphological predictions. [Internet] [Doctoral dissertation]. Delft University of Technology; 2020. [cited 2020 Oct 31]. Available from: http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; 10.4233/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:isbn:978-94-6384-091-0 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3.

Council of Science Editors:

Bosboom J. Quantifying the quality of coastal morphological predictions. [Doctoral Dissertation]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; 10.4233/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; urn:isbn:978-94-6384-091-0 ; urn:NBN:nl:ui:24-uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3 ; http://resolver.tudelft.nl/uuid:e4dc2dfc-6c9c-4849-8aa9-befa3001e2a3

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