Research on astronomical tide and tsunami coupled model

Abstract

An astronomical tide and tsunami coupled numerical model of East China Sea was established by adding tidal boundary conditions into COMCOT tsunami model. Two different tsunami wave, positively leading wave and negatively leading wave, were designed according to the dislocation direction of earthquake plates during an undersea earthquake with magnitude of 7.6 which occurs in Ryukyu Trench. The tsunami wave crest and astronomic high tide level occurs at the same time through the modification of phase of tsunami wave. Comparison about the summation of astronomic tide level and tsunami wave level was made between the result of coupling model and linear sum. It demonstrated that the tsunami wave was in advance in both cases abovementioned whether the leading wave is positive or negative. And it’s safer for the result of linear sum with respect to tsunami wave height.