TOPOGRAPHIC CHANGE OF SAND BARS AT URBAN RIVER MOUTH BOTH WITH THE SHORT AND LONG TIME SCALE

Abstract

 We conducted the field observations and analyzed weather and wave data to grasp the water environment and topographic change at river mouth on a short-term scale. Moreover, we examined the topographic change at the river mouth by using aerial photographs on a long-term scale. Study site is Akashi River mouth, Hyogo Prefecture in Japan. From on a short-term scale study, it is clarified right bank sandbar often developed than left bank one. However, from the result of the long-term scale study, it turned out opposite to short-term scale study.