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J. Mar. Sci. Eng. 2018, 6(3), 74;

Failure of Grass Covered Flood Defences with Roads on Top Due to Wave Overtopping: A Probabilistic Assessment Method

Water Management Department, Delft University of Technology, 2628 CN Delft, The Netherlands
Marine and Fluvial Systems Group, University of Twente, 7522 NB Enschede, The Netherlands
Ministry of Infrastructure and Water Management (Rijkswaterstaat), 8224 AD Lelystad, The Netherlands
Author to whom correspondence should be addressed.
Received: 22 April 2018 / Revised: 15 June 2018 / Accepted: 19 June 2018 / Published: 22 June 2018
(This article belongs to the Special Issue Climate Change, Coasts and Coastal Risk)
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Hard structures, i.e., roads, are commonly found over flood defences, such as dikes, in order to ensure access and connectivity between flood protected areas. Several climate change future scenario studies have concluded that flood defences will be required to withstand more severe storms than the ones used for their original design. Therefore, this paper presents a probabilistic methodology to assess the effect of a road on top of a dike: it gives the failure probability of the grass cover due to wave overtopping over a wide range of design storms. The methodology was developed by building two different dike configurations in computational fluid dynamics Navier–Stokes solution software; one with a road on top and one without a road. Both models were validated with experimental data collected from field-scale experiments. Later, both models were used to produce data sets for training simpler and faster emulators. These emulators were coupled to a simplified erosion model which allowed testing storm scenarios which resulted in local scouring conditioned statistical failure probabilities. From these results it was estimated that the dike with a road has higher probabilities (5 × 10−5 > Pf >1 × 10−4) of failure than a dike without a road (Pf < 1 × 10−6) if realistic grass quality spatial distributions were assumed. The coupled emulator-erosion model was able to yield realistic probabilities, given all the uncertainties in the modelling process and it seems to be a promising tool for quantifying grass cover erosion failure. View Full-Text
Keywords: wave overtopping; dike; levee; failure; emulation; roads; flood risk; erosion wave overtopping; dike; levee; failure; emulation; roads; flood risk; erosion

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Aguilar-López, J.P.; Warmink, J.J.; Bomers, A.; Schielen, R.M.J.; Hulscher, S.J.M.H. Failure of Grass Covered Flood Defences with Roads on Top Due to Wave Overtopping: A Probabilistic Assessment Method. J. Mar. Sci. Eng. 2018, 6, 74.

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