Abstract
The filed site of this research is located on the center of the eastern coast of Ariake Bay at the river mouth of Shirakawa river. Monthly bed level measurements from 2001 to 2016 with the distance 100m to 1050 m and the interval of 50 m have been carried out using total station surveying instrument. The present survey method takes more time and cannot measure wide region.
Applying UAV surveying method to tidal flat is little. Therefore, focusing on the water edge of run up waves, the bed level was estimated. And comparing the values by UAV and by total station, they were almost the same.
