Abstract
The river discharge is one of principal and significant hydrological quantities on river planning, management, and environmental conservation. In order to perform a highly accurate measurement of discharge, the authors have developed techniques for estimating cross-sectional average flow velocity in conjunction with a hydroacoustical measurement of local velocity and a numerical simulation of velocity distribution. The newly developed discharge measurement system “ATENAS” was installed at the Tone River, and verified its performance at the river 500m in width. The obtained accuracy was comparable with or better than that of an acoustic Doppler current profiler. By using the ATENAS, the discharge from the reverse flow to 4, 000m3/s was measured continuously and stably, while the discharge estimation by floats revealed its instability during the flood. In the case of high volume of discharge, the current profiler underestimated the flow velocity, which was considered to be caused by sediment motion on the riverbed.
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