An automatic velocity measurements system operated by P. C. Velocity measurements for open channel flows

Abstract

A P. C.-controlled automatic measuring system is developed for quantifying three-dimensional structure of open channel flows. Manual-controlled measuring systems require a great deal of time and labor as well as cause error in measurements. The proposed system allows us to obtain the velocity field of the considering flow with little manpower and high accuracy. In addition, an error inherent to spacing of two sensors, which usually occurs in measurements of velocity components by X-type Hot-film anemometer, is rectified on the basis of logarithmic velocity profile.