Beach Profile Evolution in Front of Storm Seawalls: A Physical and Numerical Study

Abstract

Large-scale physical experiments (Froude scale, 1:4.3) were performed at the new Delta Flume in 2017, aimed at investigating wave impacts on a vertical wall placed on the top of a dike in a mild slope shallow foreshore. Experiments also allowed to investigate the morphological evolution of the sandy foreshore, the scour at the dike toe and its development under irregular and bi-chromatic wave conditions. Both experimental results and numerical study performed to design the experiments are reported. Moreover, preliminary validation of the model to investigate the scour within a wider range of wave conditions and foreshore slopes is illustrated.

Validation of RANS Modelling for Wave Interactions with Sea Dikes on Shallow Foreshores Using a Large-Scale Experimental Dataset

“…In this way, even numerical models with a high computational demand are able to simulate the tests in a reasonable amount of computational time. This specific bichromatic wave test was chosen because it is the only test that was conducted shortly after a foreshore profile measurement and at the same time immediately followed by its repetition and another foreshore profile measurement [32,33]. Since these bichromatic wave tests are relatively short in duration and only limited changes (O(10 −2 m)) were noted between the profile measurements before and after [32], a fixed bed is a reasonable assumption for the numerical modelling.…”

Influence of Underwater Bar Location on Cross-Shore Sediment Transport in the Coastal Zone

“…This fact induced us to prove the idea that the location of the underwater bar defines the shape of shoreline to some extent. Numerical computation by using XBeach [13] has been chosen as a main tool, because this is a well-developed and popular open-source hydrodynamic and morphology modelling package [14,15]. The non-hydrostatic mode of XBeach, which we used for wave and bottom changes modelling, resolves short waves and provides an accurate reproduction of wave propagation in shallow water [16].…”

Non-Repeatability, Scale- and Model Effects in Laboratory Measurement of Impact Loads Induced by an Overtopped Bore on a Dike Mounted Wall

“…Waves were generated in both scale models with a pistontype wave paddle. Two tests with wave conditions similar to a storm with a 1-in-1000 (Irr_4_F) and 1-in-17000 (Irr_1_F) return interval [15] were selected for this study.…”

“…It is striking that the wave height at the dike toe in the small-scale model was lower than in the large-scale model. This difference could possibly be explained by the Copyright © 20xx by ASME increased water depth at the dike toe due to the fully developed erosion hole in the large-scale model (~0.15m in model scale and 0.65m in prototype [15]), because the test was conducted at a later time during the experimental campaign, while Irr_1_F was conducted in the beginning of the experimental campaign, with less erosion at the dike toe [13].…”