HYDRODYNAMIC STRUCTURE IN A LARGE DAM RESERVOIR DURING EARLY AUTUMN

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  • 初秋期のダム貯水池における流動構造に関する観測と解析

Abstract

<p> In this study, field measurement was first carried out in Isawa Dam Reservoir, located in the Kitakami River system, on the flow structure under a thermally stratified condition. The administrator and the local people of the reservoir have concerns about prolonged discharge of higher turbidity water into the downstream, and the purpose of this study is to analyze flow structure in the reservoir that can influence on behavior of fine suspended sediment. The measurement was conducted at the beginning of autumn, when the stratification was about to be destroyed by the cooling weather conditions. The period was about one month from the end of August through September, 2016. Vertical structure of velocity in the reservoir was continuously measured with ADCP deployed on the bottom of the reservoir during that period. From this observation result, layered structures of flow velocity were found in the both horizontal and vertical velocity components. However, the respective components showed different appearances of structures and behaviors with each other. Besides, in the latter half of of the measurement, scattered velocity variation was observed in the epilimnion, which was presumed to be caused by the turnover mixing initiated by surface water cooling. Numerical hydrodynamic analysis was then conducted. The results of the simulation, however, were not able to express the layered flow structure revealed in the measurement, but distributions of vertical velocity and eddy viscosity that seem to correspond to the surface mixing were identified.</p>

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