抄録
It is estimated that maximum sea water level became 3m at area of Tokyo bay based on the earthquake tsunami that report 2 of committee on the Megae earthquake model of the Nankai Troughs.Therefore, we carried out an analysis of ascendimg tsunami at a small river in the central Tokyo. We had investigated by unsteady flow of 1D analysis, still more, using an observation data that changing of river water level in the east Japan great earthquake.Futher more, we analys under condition of an estimated tsunsmi of 3m, and two case of water gates open and close. The result is following, if water gates could not close in the Kamejima river,inundation area was simulated at around of river area due to flow in tsunami, maximum inundation water depth and area became 4.8m,0.65km2. It was found that the most important water is management of water gates when Mega earthquake occur.
