How strong are our levees? Hydraulic analysis based on Polder2c’s project in situ testing
Rikkert, S.J.H.; Alleon, C.; Khaldi, I.; Shaiek, S.; Verelst, K.; Ebrahimi, M.; Soares Frazao, S.; Kaidi, S.; Smaoui, H.; Sergent, P. (2021). How strong are our levees? Hydraulic analysis based on Polder2c’s project in situ testing, in: SimHydro 2021: Models for complex and global water issues - Practices and expectation. pp. [1-14] In: (2021). SimHydro 2021: Models for complex and global water issues - Practices and expectation. IAHR: [s.l.]. , more |
| Available in | Authors | | Document type: Conference paper
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| Keywords | Hydraulic structures > Dikes, shores and other flood defenses > Erosion protection
Hydraulic structures > Dikes, shores and other flood defenses > Failure mechanisms
Numerical modelling
| | Author keywords | Overflow, in-situ testing, models comparison, models calibration, polder2C’s. |
| Authors | | Top | - Rikkert, S.J.H.
- Alleon, C.
- Khaldi, I.
- Shaiek, S.
| - Verelst, K., more
- Ebrahimi, M.
- Soares Frazao, S.
| - Kaidi, S.
- Smaoui, H.
- Sergent, P.
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| Abstract | In the framework of climate change, and especially sea level rise, the Polder2C’s project has been set up to improve, among others, knowledge of external erosion processes on seashore earth dikes. Within the project, overflow, overtopping and breaching in-situ tests are carried out in the Hedwige- and Prosperpolder, while numerical models are set up to improve technical analysis of testing results. This paper describes blind predictions of water depth and flow velocity on the slope of a levee during an overflow event prior, before the test is conducted, using a range of different state-of-the-art numerical models. This model predictions were performed by several partners of the Polder2C’s project. No in advance calibration of the numerical models was carried out, all models considered the same levee geometry, roughness of the grass cover layer and upstream boundary conditions. The aim of the comparison is to identify best numerical tools to predict flow pattern for different hydraulic loadings, since it takes part of the erosion process, which is to be analyzed as a second step. Homogeneous results have been found with the different deployed tools, with some spread partially linked to numerical uncertainties, and calculation methods. Next, numerical modelling steps within the project are calibration of the hydraulic models (e.g. the roughness of the grass cover layer) and modelling of the erosion process under calculated hydraulic loading conditions. In order to calculate the erosion of the cover layer, the computed erosion will be compared with the erosion measured during the field experiments within the coming years.
This project is partly funded by the Interreg 2 Seas 2014-2020 programme, and co-financed by the European Regional Development Fund within subsidy contract number [2S07-023]. |
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