Estinlation Method of Water Depth at the River Mouth and Limit of Application

Morphology of sand spit at a river mouth is affected by combined forces, such as tidal current, sea waves and river discharge, etc. Topographical change at a river mouth can beremarkable dependent on time-variation of these forces. However, in order to obtain frequent topography data at a river mouth, it is necessary to consume a great amount of time and cost, Thus, if it is possible to estimate river mouth topography information from water level variation data, it will be practically effective for river mouth management. However, river mouth characteristics diferent in each river. Therefore, it is necessary to clarify the river mouth characteristics. In this study, water depth estimation method is applied to field data at a river mouth. Moreover, the application limit of this method was discussed