Prediction of Sand Beach Variations by Coupling of Hydrodynamic and Morphological Models during Extreme Storms

Efficient Real-time Erosion Early Warning System and Artificial Sand Dune Breaching on Haeundae Beach, Korea

“…This paper first reinforces the numerical verification of the previous study by Suh et al (2017) and then examines the cause and effect of dune breaching and collapse through hindcasting simulations. That is, the collapse shape and size of the artificial sand dune in response to the external force at the time of the typhoon are quantitatively reproduced via numerical experiments in this study.…”

“…In this successive study, the loosely coupled beach erosion model proposed in a previous study (Suh et al, 2017) was calibrated against the measured post-storm profile for Typhoon Chaba. To analyze the effectiveness of the data on the near realtime morphological changes based on early forecasted typhoon advisories, five transect lines were selected, as shown in Figure 2.…”

“…As the numerical scheme, a circulation model incorporating storm waves ADCIRC+SWAN (Dietrich et al, 2012) is coupled with the XBeach model (Roelvink et al, 2009); this coupled scheme has been described in detail in the previous paper (Suh et al, 2017). According to previous studies (Kim and Suh, 2016;Suh et al, 2017), most characteristics of typhoons affecting Korea can be accurately determined as they pass through the Ryukyu islands, which lie between Taiwan and Japan. The typhoon forecast is captured every 6 h, and the storm surge model is automatically initiated when the center of the typhoon penetrates those islands, entering the continental shelves.…”

“…Numerical hindcasting for comparison of the suggested scheme with the observed field morphological changes induced by historical storms has been performed for two representative typhoons, Maemi (TY0314) and Sanba (TY1216), on Haeundae Beach. Although those researchers proposed a well-designed beach erosion framework, there was insufficient verification based on field measurements in the study (Suh et al, 2017).…”

“…Those researchers treated supercritical flow to enable the integrated coastal process model to simulate both overflow and overwash flow induced by storm surges and waves. Further, Suh et al (2017) have demonstrated an efficient early warning system (EWS) for a sand beach constructed via loose coupling of the Advanced Circulation (ADCIRC) + Simulating Waves Nearshore (SWAN) and XBeach models using Perl script. Numerical hindcasting for comparison of the suggested scheme with the observed field morphological changes induced by historical storms has been performed for two representative typhoons, Maemi (TY0314) and Sanba (TY1216), on Haeundae Beach.…”