Abstract
This paper discusses effects of on-land buildings with hydraulic model experiment for reducing disasters caused by tsunamis and storm surges. The experiments were conducted with modifying arrangement of buildings and varying spaces between buildings. Their results identify that a layout of front buildings facing the seaside make the most effective for reducing a runup height through measurement of water levels and flow velocity between buildings. Maximum flow rate of wave runup, Qmax, which is defined as a product of water depth at highest water level, maximum velocity and net width of wave runup, correlates closely with maximum wave runup distance, Lniax. It is noted that due to combined effects on damping water levels and flow velocity, buildings are effective in reduction of disasters from tsunamis and storm surges.
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