Abstract
Wave shoaling often occurs in the estuary where incident wave penetrates to river flow. For boat navigation, that can make a severe condition even in a calm weather. To predict such an increase of wave height in a harbor area next to an estuary, a simple method is developed in this paper. In this method, the distribution of wave heights without considering effects of river flows are simulated using a Boussinesqtype wave transformation model, and then, wave amplification due to river flow are presumed using Wave Action Conservation Theory with expanded flows into the harbor area estimated by numerical simulation. Around a model harbor in front of river mouth, increased significant wave heights are calculated through the stream in opposite direction against wave propagating, and decreased significant wave heights are calculated behind the breakwater, where both stream and wave propagation direction are the same.
