Abstract
For operation and management of dams, it is most essential to evaluate inflow and outflow discharges in dam reservoirs. Outflow discharges have been evaluated from reservoir water elevations and gate openings. However, water surface elevations might be different by observation point at a meandering part of reservoir. In this study, a 2D depth-integrated flow model was improved in order to consider water surface elevations near gates. Moreover, estimation method of outflow discharge was proposed using charts, which were constructed employing the 2D flow model. The comparison between the numerical and observed results revealed that the proposed method could reasonably reproduce the outflow discharge even if difference in water surface elevation was generated.
