University of Twente Student Theses
Pressure propagation through the bed in the swash zone of a sandy beach : a data and modelling study with possible implications for sediment transport
Pauli, T. (2020) Pressure propagation through the bed in the swash zone of a sandy beach : a data and modelling study with possible implications for sediment transport.
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| Abstract: | To ensure flood safety, it is important to acquire knowledge on coastal development. The morphology of the coast changes by sediment transport under wave forcing conditions. One of the most important coastal areas where sediment is transported, is the swash zone of a beach. The swash zone is the nearshore part of the beach, intermittently covered by water and exposed to the air, due to wave uprush and backwash. Pressure propagates through the bed as a response to the waves with a pressure amplitude attenuation and phase lag, by increasing depth. This leads to vertical pressure gradients in the bed, which affect the effective sediment weight. Simultaneously, ventilated boundary layers arise, which stabilize or destabilize the ow velocity at the bed during infiltration or exfiltration, associated with the pressure gradients. A destabilization of the ow velocity will decrease the bed shear stress. In this thesis, the in uence of the pressure gradient for both processes and the implication on sediment transport is studied in more detail. In order to achieve this, the pressure propagation will be modelled, to determine the pressure gradients at the bed surface. |
| Item Type: | Essay (Master) |
| Faculty: | ET: Engineering Technology |
| Programme: | Civil Engineering and Management MSc (60026) |
| Link to this item: | https://purl.utwente.nl/essays/83199 |
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