Abstract
Measuring quantity of water intake is important to manage a hydroelectric power plant. However, there are some plants without a sufficient straight steel penstock nor open channel, where traditional measuring methods are difficult to apply to. On the other hand, since ultrasonic Doppper method (UDM) can measure flow velocity profiles, this method has an advantage of application to a non-developed flow condition. In this paper, cross-wise velocity profiles are measured using pitot tube in an open-channel test section with and without a blockage. And velocity profiles, which are measured by using the electromagnetic current meter and UDM, are compared. Then the results of these cross-sectional average flow velocities calculated using Gauss-Legendre quadrature show good agreements.
