Optimization research of reservoir flushing scheme based on one-dimensional numerical model
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Abstract:
Building reservoirs on a river breaks the original balance of flow and sediment. Once the incoming sediment begins to deposit, a siltation will take place in the reservoir area. To slow down the siltation, reservoir flushing is widely used in the reservoir operation. However, reservoir flushing would inevitably waste too much water of a reservoir, damaging the comprehensive benefits of the reservoir. Therefore, the relationship between siltation and benefits must be balanced. As for a certain reservoir, on the condition that the current operation regulations are obeyed, a long-term numerical simulation of flushing process is conducted for different flushing schemes, in which the reasonable ranges of water level and discharge of flushing are proposed, by adopting an one-dimensional non-uniform flow and non-equilibrium sediment transport model, and the multi-year average amount of siltation and electricity generation are calculated to be the indices of the selecting of appropriate flushing schemes. The results indicate that the flushing scheme of a lower water level and a longer duration has a better effect on slowing down the siltation in the reservoir area, with the loss of electricity generation relative small.
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