Wasiljew, Maria (2025) Comparison of Effectiveness of Various Roughness Elements for Coastal Dikes using ComFLOW. Master's Thesis / Essay, Applied Mathematics.
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Abstract
Floods are natural disasters that can cause tremendous destruction and loss of life. The risk of occurrence increases every year due to environmental changes, such as rising sea levels and more severe and unpredictable weather conditions. As such, coastal defense is crucial to ensure the safety of the population. Roughness elements are placed on dikes to absorb the wave energy and reduce the amount of overtopping. The efficiency of this component of the dike is studied through numerical simulations performed with ComFLOW, a software tool that has been developed at the University of Groningen to simulate complex fluid flow. With this tool, various characteristics of roughness elements are studied in order to improve the efficiency of the design. It is found that increasing the size of the elements and the height difference between them is beneficial. Further results suggest that to reduce the overtopping, roughness elements have to induce a high amount of turbulence in the flow, as well as redirect the trajectory of the wave. The first is attained by incorporating a `free passage' into the design of the elements. To redirect the wave, a rounded incision is applied to the last block. The optimal roughness elements added on top of a smooth dike reduced the overtopping by a factor of 5. Furthermore, through the study of numerical errors, a suitable simulation setting is found, which ensures a high accuracy of the results while lowering the computational time.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Luppes, R. and Koellermeier, J. |
| Degree programme: | Applied Mathematics |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 01 May 2025 06:13 |
| Last Modified: | 01 May 2025 06:13 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/35127 |
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