DISCUSSION OF ACCURACY EVALUATION METHODS FOR FLOOD FLOW OBSERVATION BY TOWING ADCP

Abstract

The authors have been developing an accuracy-evaluation method for flood flow observation with an Acoustic Doppler Current Profiler (ADCP). Several field measurements were conducted under severe ADCP measurement conditions characterized by high velocity and highly-frequent water-surface vibration. This paper described main factors which influence the accuracy of velocity/water-depth measurements and reviewed previous observation results. To finalize the development of the accuracy-evaluation methods, the authors conducted field measurements under severe conditions with highly sophisticated devices and verified the method with high-quality datasets. Finally it was applied to previous flood observation results obtained in the Shimanto River.