Characteristics of River Flows by Field Measurements

Abstract

The turbulent fluctuations of velocity have been measured actual rivers in the field where the relative water depth to roughness height is small, using ultrasonic flowmeter. The turbulent structures of river flows where roughness is relatively small, are similar to those in laboratory channels with the smooth bed. For the rivers where the roughness is relatively large, the turbulent structures in the river bed region are very complex and significantly different from those in laboratory channels with the smooth bed.