LOCAL SCOUR ANALYSIS AROUND A SPUR DIKE DURING A SURGE PASS

Abstract

Although many researchers have studied the local scour phenomenon around a spur dike experimentally and analytically, almost all the studies have been carried out for the steady flow state. This paper focused on a local scour around a spur dike during a surge pass and bed variations around the spur dike is investigated numerically by using a two dimensional numerical model with flux difference splitting technique under unstructured grid system. At first, the applicability of the employed numerical method was examined under the steady flow state. Secondly, rapidly varied flow such as surge flow condition was applied. The numerical results show good agreement with the experimental results.