Influence of coastal flooding on surge estimates along the east coast of India

In this paper, the influence of coastal flooding on surge estimates along t he coast is examined using a procedure that is different from the conventio nal wet-dry grid point method. The coastal boundary is assumed fixed in the present study. The mass and momentum fluxes across the coastal boundary du e to surge flooding the coastal regions are modelled as sources/sinks along this boundary in the equations governing the flow field. The equations are solved using an explicit finite element scheme. The surges estimated with the source terms in the governing equations (i.e. allowing coastal flooding ) and without them (i.e. applying the impermeable vertical wall assumption along the coast) show that the coastal flooding has insignificant influence on surge levels along the coast. Hence surges along the coast could be acc urately estimated using the simple model, which assumes a Fixed impermeable vertical wall along the coastal boundary.