Abstract
The purpose of this contribution is the representation of real wave overtopping over sea dikes with the Rans-Vof code (IH-2VOF) developed by the University of Cantabria. More specific objectives are: to identify the real capacity of the IH-2VOF model in the prediction of overflow and to determinate the accuracy of these predictions in order to provide designers with a generally applicable methodology to use the code. The model is validated against experimental tests conducted by Hughes at the U.S. Army Engineer Research and Development Center (ERDC). This analysis shows that the model tends to overestimate wave reflection and better results are obtained by introducing a porous layer around the structure as artificial way to reduce reflected wave energy.
Highlights
Vulnerability and resilience of dikes and sea banks play a key role in the safety of coastal areas.Ideally these defenses should be designed with a crest height and width to prevent flooding for any climate scenarios but the uncertainty in climate conditions, worsened by climate change, and the high costs require that a certain overtopping level has to be accepted.Dike overtopping produces high-speed currents and turbulence (Schuttrumpf and Oumeraci, 2005) that may induce damage of the protection layers and expose at erosion the under layers in case of soil dikes
Description of the tests The overtopping discharge resulting from combined storm surge overflow and wave overtopping of a levee with a trapezoidal cross section was studied in 1:25 scale in the 0.91-m-wide wave flume at the U.S Army Engineer Research and Development Center (ERDC), Coastal and Hydraulics Laboratory (CHL) in Vicksburg, MS
It can be observed that the representation is overall optimal and both experimental and numerical data are very well approximated by a Weibull statistic distribution
Summary
Vulnerability and resilience of dikes and sea banks play a key role in the safety of coastal areas. Description of the tests The overtopping discharge resulting from combined storm surge overflow and wave overtopping of a levee with a trapezoidal cross section was studied in 1:25 scale in the 0.91-m-wide wave flume at the U.S Army Engineer Research and Development Center (ERDC), Coastal and Hydraulics Laboratory (CHL) in Vicksburg, MS. A fiber-optic laser Doppler velocimeter (LDV) was used to measure the horizontal component of flow velocity directly above pressure cell P2 (see Fig. 3) near the rearward edge of the levee crest. This cross-flume location was directly above pressure cell P2. The length of the numerical channel is shorter than the one in the laboratory since the numerical simulation starts from Wave Gauge (WG) 2 on (placed at a distance of 29.7151 m from the WM)
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