Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtopping
<p>The study aims to provide a complete analysis framework applied to an earthen dike located in Camargue, France. This dike is regularly submitted to erosion on the landward slope that needs to be repaired. Improving the resilience of the dike calls for a reliable model of damage frequency. T...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-09-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | https://nhess.copernicus.org/articles/23/3111/2023/nhess-23-3111-2023.pdf |
| _version_ | 1797672667531182080 |
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| author | C. Houdard C. Houdard A. Poupardin P. Sergent A. Bennabi J. Jeong J. Jeong |
| author_facet | C. Houdard C. Houdard A. Poupardin P. Sergent A. Bennabi J. Jeong J. Jeong |
| author_sort | C. Houdard |
| collection | DOAJ |
| description | <p>The study aims to provide a complete analysis framework applied to an earthen dike located in Camargue, France. This dike is regularly submitted to erosion on the landward slope that needs to be repaired.
Improving the resilience of the dike calls for a reliable model of damage frequency. The developed system is a combination of copula theory, empirical wave propagation, and overtopping equations as well as a global sensitivity analysis in order to provide the return period of erosion damage on a set dike while also providing recommendations in order for the dike to be reinforced as well as the model to be self-improved. The global sensitivity analysis requires one to calculate a high number of return periods over random observations of the tested parameters. This gives a distribution of the return periods, providing a more general approach to the behavior of the dike. The results show a return period peak around the 2-year mark, close to reported observation. With the distribution being skewed, the mean value is higher and is thus less reliable as a measure of dike safety. The results of the global sensitivity analysis show that no particular category of dike features contributes significantly more to the uncertainty of the system. The highest contributing factors are the dike height, the critical velocity, and the coefficient of seaward slope roughness. These results underline the importance of good dike characterization in order to improve the predictability of return period estimations. The obtained return periods have been confirmed by current in situ observations, but the uncertainty increases for the most severe events due to the lack of long-term data.</p> |
| first_indexed | 2024-03-11T21:33:32Z |
| format | Article |
| id | doaj.art-1630b7559ccc4e9d8dfef40977f4fc92 |
| institution | Directory Open Access Journal |
| issn | 1561-8633 1684-9981 |
| language | English |
| last_indexed | 2024-03-11T21:33:32Z |
| publishDate | 2023-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj.art-1630b7559ccc4e9d8dfef40977f4fc922023-09-27T05:11:07ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812023-09-01233111312410.5194/nhess-23-3111-2023Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtoppingC. Houdard0C. Houdard1A. Poupardin2P. Sergent3A. Bennabi4J. Jeong5J. Jeong6ESTP Paris, 28 Avenue du Président Wilson, 94230 Cachan, FranceGustave Eiffel University, Cité Descartes, 77200 Marne-la-Vallée, FranceESTP Paris, 28 Avenue du Président Wilson, 94230 Cachan, FranceCEREMA Risques, Eau et Mer, 134 rue de Beauvais, 60280 Margny-les-Compiègne, FranceESTP Paris, 28 Avenue du Président Wilson, 94230 Cachan, FranceESTP Paris, 28 Avenue du Président Wilson, 94230 Cachan, FranceGustave Eiffel University, Cité Descartes, 77200 Marne-la-Vallée, France<p>The study aims to provide a complete analysis framework applied to an earthen dike located in Camargue, France. This dike is regularly submitted to erosion on the landward slope that needs to be repaired. Improving the resilience of the dike calls for a reliable model of damage frequency. The developed system is a combination of copula theory, empirical wave propagation, and overtopping equations as well as a global sensitivity analysis in order to provide the return period of erosion damage on a set dike while also providing recommendations in order for the dike to be reinforced as well as the model to be self-improved. The global sensitivity analysis requires one to calculate a high number of return periods over random observations of the tested parameters. This gives a distribution of the return periods, providing a more general approach to the behavior of the dike. The results show a return period peak around the 2-year mark, close to reported observation. With the distribution being skewed, the mean value is higher and is thus less reliable as a measure of dike safety. The results of the global sensitivity analysis show that no particular category of dike features contributes significantly more to the uncertainty of the system. The highest contributing factors are the dike height, the critical velocity, and the coefficient of seaward slope roughness. These results underline the importance of good dike characterization in order to improve the predictability of return period estimations. The obtained return periods have been confirmed by current in situ observations, but the uncertainty increases for the most severe events due to the lack of long-term data.</p>https://nhess.copernicus.org/articles/23/3111/2023/nhess-23-3111-2023.pdf |
| spellingShingle | C. Houdard C. Houdard A. Poupardin P. Sergent A. Bennabi J. Jeong J. Jeong Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtopping Natural Hazards and Earth System Sciences |
| title | Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtopping |
| title_full | Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtopping |
| title_fullStr | Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtopping |
| title_full_unstemmed | Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtopping |
| title_short | Sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern France submitted to wave overtopping |
| title_sort | sensitivity analysis of erosion on the landward slope of an earthen flood defense located in southern france submitted to wave overtopping |
| url | https://nhess.copernicus.org/articles/23/3111/2023/nhess-23-3111-2023.pdf |
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