DEVELOPMENT OF WATER-LEVEL/VELOCITY MEASURING INSTRUMENT WITH RADAR TECHNIQUE

Abstract

 The authors have developed an automatic discharge measurement system at the river section, where river bed elevation and flow direction frequently changes. The system requires remotely operative, capable enough to predict the river bed evolution by the observed values, and stable measurement with less missing data. The water-velocity/level measuring instrument is a core component for the system. This paper describes a measurement principle, results of a technical-examination on the actual river, and one of the results of a preliminary observation. Regarding the technical-examination, the results indicated the accuracy of ±15cm/s in the coverage range of 300m about velocity, as well as ±10cm in the coverage range of 50m about level. Regarding the preliminary unmanned-observation setup at the Yamamoto observatory of Hime River appropriate the water-level observation confirmed.