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| Tidal marsh stability under very high flow velocities: experiment in the tidal flume facility at the UAntwerp in context of the dike breach experiments in the Hedwige-Prosperpolder as part of the INTERREG POLDER2C's project Schoutens, K.; Temmerman, S. (2021). Tidal marsh stability under very high flow velocities: experiment in the tidal flume facility at the UAntwerp in context of the dike breach experiments in the Hedwige-Prosperpolder as part of the INTERREG POLDER2C's project. INTERREG project POLDER2C’s. Universiteit Antwerpen (UA): Antwerp. 19 pp. |
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Physical modelling |
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Contactgegevens
Opdrachtgever: Vlaamse overheid; Beleidsdomein Mobiliteit en Openbare Werken; Vlaams Ministerie Mobiliteit en Openbare Werken; Departement Mobiliteit en Openbare Werken; Waterbouwkundig Laboratorium (WL), meer
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| Abstract |
Within the framework of the Interreg Polder2C’s project, a controlled lab-flume experiment was conducted in the tidal flume at the University of Antwerp to study the erosivity of a tidal marsh. In winter 2021, marsh monoliths (80 x 120 x 40 cm) were extracted in reed marshes in front of the dikes of Living Lab Hedwige-Prosperpolder (LL HPP*) and installed as a 10 m test section in the lab-flume. Both sediment bed dynamics and vegetation responses were quantified over 6 experimental runs. During each run, extreme flow velocities which can be expected during a dike breach, were applied for 2 hours (up to 2 ms-1 compared to 0-0.2 ms-1 during normal spring tides). First results indicate that the tidal marsh is highly stable. Apart from the organic debris layer which flushed away in the first experimental run, erosion was limited even when aboveground vegetation was removed. During the runs, the reed stems were strongly bent by the water, however the shoots recovered rapidly when the flow stopped. These results emphasize the potential safety function of tidal marshes in the context of nature-based levee and bank protection, even during a dike breach hazard. *Living Lab HPP is a temporary stretch of about 3 km of levees at the Dutch Belgian border available for the (research) experiments and (training) exercises thanks to the realization of the depoldering of Hedwige-Prosperpolder within the framework of the updated Sigmaplan. |
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