VALIDATION OF AUTOMATIC PARAMETER ESTIMATION METHOD OF MAXIMUM ENTROPY METHOD USING STIV MEASUREMENT VALUES

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  • STIV計測値を用いた最大エントロピー法のパラメータ自動推定手法の検証

Abstract

<p> In the non-contact method of observing river surface velocities, the flow rate is generally estimated by an area-velocity method with a constant surface velocity coefficient. In practice, however, the surface velocity coefficient is expected to vary depending on the river geometry and other factors. A method using a vertical velocity distribution equation based on the concept of the maximum entropy method has been proposed as a flow estimation method that can take this point into account. However, this method requires a measurement of the cross-sectional velocity distribution at least once to set the entropy parameter M, which is a problem for application to a new location. In this study, we examined the recently proposed method of automatic estimation of M using the observed data of STIV, an image measurement method. The results showed that M were reasonably estimated for several rivers, and that the accuracy of flow estimation was improved in cases where a constant surface velocity coefficient, which is usually used, is not appropriate.</p>

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