Print Email Facebook Twitter Influence of the partial closure of estuaries on the residual sediment transport and trapping Title Influence of the partial closure of estuaries on the residual sediment transport and trapping Author Sindy, F. (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Applied Sciences) Contributor Schuttelaars, H.M. (mentor) de Roode, S.R. (graduation committee) Degree granting institution Delft University of Technology Programme Applied Mathematics | Applied Physics Date 2020-08-19 Abstract In this thesis the water motion and sediment dynamics are investigated in a periodically closed and opened estuary. The water motion in an estuary is mainly driven by the semi-diurnal tide with an period of 12h25m and river discharge. An example of such an estuary is the Ems-Dollard estuary. Recent observations show an increase in tidal range (height difference between high and low tide), suspended sediment concentration and the depletion of oxygen levels (consequently harming the ecosystem). A possible solution, periodically closing and opening the estuary, is investigated. The water motion in a periodically opened and closed estuary is described by the linearised cross-sectionally averaged equations which give the sea-surface elevations and tidal velocity when solved with the eigenfunction expansion method. It was found that the sea-surface elevations and tidal velocity for a periodically opened and closed estuary are again 12h25m periodic. For the sediment transport, when no overtide is considered the residual sediment transport is seaward directed if the estuary is closed at low water and landward directed if the estuary is closed at high water. The barrier location determines the magnitude of the residual sediment. When overtide is included in the forcing of the system no relation is foundbetween the direction of the residual sediment transport and the closing height and closing position. The location of the barrier and closing height both determine the magnitude of the residual sediment transport and direction. By introducing a barrier that periodically closes and opens we intended to achieve a seaward directed residual sediment transport in the Ems-Dollard estuary. The results suggest that this is not possible. Further research is needed with moreextensive models to confirm this. For future Research I recommend to extend the model to a two-dimensional model with the eigenfunction expansion method. Other possibilities may be to consider a spatial dependent erodible bed. Subject Ems EstuaryLinearised Cross-sectionally averaged equationsOvertideEigenfunction expansion method To reference this document use: http://resolver.tudelft.nl/uuid:18fad0ed-5152-45f7-a091-5a1b198aff7e Part of collection Student theses Document type bachelor thesis Rights © 2020 F. Sindy Files PDF Ferhat_Sindy_4751957_1_.pdf 6.89 MB Close viewer /islandora/object/uuid:18fad0ed-5152-45f7-a091-5a1b198aff7e/datastream/OBJ/view