THE VARIATION OF WATER LEVEL AND FLOW VELOCITY IN SEMI-CLOSED WATER AERA BY WIND AND BOAT WAVE

In this study, to clarify the relationship between water level variation and turbulence of flow, field observations were carried out in Omaehama beach, Nishinomiya City, Hyogo Prefecture, JAPAN. In each observation, wind speed and its direction, water level, wave height, flow velocity and its direction were measured in the vicinity of shoreline. The data of wave height was transformed to the velocity by using a liner filter theory and examined the effect of boat wave and wind one on turbulence of flow. The transferred velocity from wind wave was coincided with the turbulence of flow, however, that from boat wave was not so good. From the results of this study, we can see both boat wave and wind one are the significant factors of water level variation in urban semi-closed water area.