THREE-DIMENSIONAL MORPHODYNAMIC MODEL USING ONE-EQUATION TURBULENCE MODEL FOCUSING ON SCOUR OF OPENING AT THE SUBMERGED BREAKWATERS

Abstract

 At the opening of the submerged breakwaters, deep scouring may be observed by strong offshore currents. The scouring has not been sufficiently clarified. A lot of studies have been carried out using three-dimensional morphological models. However, the reproduction of topographic changes near the submerged breakwater is not sufficient. In this study, the scouring of submerged breakwaters opening were investigated using the Uradome beach in Tottori . In order to improve the accuracy of the numerical model, we have developed a new three-dimensional morphological model by using a one-equation turbulence model to the quasi three-dimensional current model. As a result, the scouring process was clarified from the field observation results. From the results in one-equation turbulence model, rip currents were generated strong in the scour point. The scouring was found to progress when the top of water depth at submerged breakwaters became low in the process of scouring. The numerical model was improved in accuracy.