EVALUATION OF FORMULA FOR EQUILIBRIUM CONCENTRATION AT REFERENCE LEVEL USING OBSERVED RESULTS IN ACTUAL RIVER

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  • 実河川における基準面浮遊砂濃度算定式の評価

Abstract

<p> Presents study evalueated the formula for equilibrium suspended sediment concentration at reference level using observed results in an actual river. The three models, such as Ashida-Michiue equation, Lane & Kalenske model and the model proposed by Harada et al., were evalueated in this study. Observed results were selected from the one in Buramaptra River conducted by Authors using ADCP, sediment sampling and others. The behaviour of the suspend sediment are non-equilibrium state. On the other hand, most of the models were constructed under equilibrium state. In order to evaluate the models, the authors carefully selected the observed results, which are reached to the equilibrium state.</p><p> With in situ sediment samplings, washload and suspended sediment were discriminated. Suspended sediment were composed with the sediments, which exist at the river bed. Washload is something which are transported from outside. With this understanding, the sediment with more than 48 μm were selected as the suspended sediment and they were used for evaluation. Concentration of 5.0×10-4 [m3/m3] was mixture of washload and suspended sediment, and 57% was consideded as suspended sediment.</p><p> Each model estimated the consentation as order of 10-1 by Ashida-Michiue formura, 10-2 by Lane & Karenske formura, and 10-3 by Harada et al. The one with Harada et al. is closest among three, but it still overestimated.</p>

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