University of Twente Student Theses
Modeling the initial impact of storm events on the deformation and migration of full-grown sand waves
Goesten, Thom (2023) Modeling the initial impact of storm events on the deformation and migration of full-grown sand waves.
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| Abstract: | Sand waves are dynamic rhythmic bed patterns of several meters in height and are created by tidal circulation cells. They migrate over the continental shelf and thereby interfere with human interventions such as (energy) infrastructure. The hydrological and morphological effects during wind and surface wave action on the sand wave dynamics determine the extreme conditions and are therefore of interest for marine construction works. Therefore wind and surface wave action is implemented to a Delft3D model, by allowing surface elevation and coupling to SWAN. Wind and surface wave conditions with a return value of 100 years are tested on full-grown sand waves. The results show that the inclusion of wind results in an ebb-directed bottom flow. Surface waves on the other hand increase flood-directed flows and increase turbulence, resulting in extra morphologic impact. The combination of wind and waves results in sediments migrating anti-wave-directed towards the previous sand wave slope. In total, the flattening of a sand wave during a once-in-a-100-years storm of 2.5 days is about as large as 20 years of tidal sand wave growth, making surface wave influences a crucial factor in modeling sand wave dynamics. |
| Item Type: | Essay (Master) |
| Faculty: | ET: Engineering Technology |
| Subject: | 43 environmental science, 56 civil engineering |
| Programme: | Civil Engineering and Management MSc (60026) |
| Link to this item: | https://purl.utwente.nl/essays/96631 |
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