Abstract
To check the accuracy of coefficients of float, which are widely used in discharge measurements with float and image processing, we examine the coefficients of float by conducting ADCP measurements for flood flows in the Edo River and the Ara River. We compare the observed results for vertical flow structure with classical well-known velocity distributions such as logarithmic profile and Aki's theory which is used in the evaluation of the general coefficients of float. The observed velocity distributions are better agreements with the logarithmic profile than Aki's theory. It is noteworthy that the observed coefficients of float show a decreasing trend as water depth increases and the averaged coefficients of float are less than the general values. These results for the coefficients of float are also good agreements with those evaluated with the logarithmic profile.
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