Field observation of sand bars movement in the Hii River

Abstract

Field observations of bed configurations and flow patterns have been carried out under floods in the Hii River which is a typical sand-bedded river in Shimane prefecture. The observation plan is comprised of three components; the measurement over wide range by using RC-boat and a model plane-loaded camera, the precise measurement over small range from abridge, and water-level measurement.
In this observation plan, time series of three-dimensional bed configurations data were successfully obtained by RC-boat for the first time under June 28-29 flood and July 12-13 flood. In this paper, the method of measurement and data analysis are described and the characteristics of sand-bars movement is discussed.