中文摘要：

金沙江是长江的主要产沙区,其泥沙主要产生在下游雅砻江汇口至屏山区间。溪洛渡与向家坝水库是金沙江下游重要的巨型水库,水库蓄水后可能形成异重流。为通过调度手段利用异重流排沙,有必要对两水库的异重流运动规律进行研究。采用水沙两相流ASM模型,对两水库不同调度方式下的异重流产生条件进行模拟和预测,探讨了异重流前锋运动规律。研究表明：溪洛渡与向家坝水库在正常蓄水位发电运行条件下均难以形成稳定运动的异重流,而在汛期运行时,一定的流量范围内,当入库浑水含沙量突增1.0 kg/m3以上时,会形成异重流,异重流的前锋运动速度与含沙量线性相关,与河床比降无明显关联,该结论对异重流调度的决策有一定的支持作用。

英文摘要：

The watershed of main stream between the Yalong river confluence to Pinshan station is the main sediment yield area in the Jinsha river. After impoundment,density current may form in Xiluodu and Xiangjiaba reservoirs,two large-scale key reservoirs on the Jinsha river. Based on different regulation modes,the production condition of density current was simulated and predicted by adopting ASM（ algebraic slip mixture） model,the density current front movement rule was discussed. The results indicated that a stably moving density current was difficult to form in the Xiluodu and Xiangjiaba reservoirs under their normal pool level of power generation while it likely occurred in the flood season. In these two reservoirs,turbidity current usually formed when the inflow sediment concentration was suddenly increased by over 1. 0 kg / m3 in a certain flow range. In addition,movement speed of density current front showed linear dependence with sediment concentration and had no obvious relationship with channel bed slope. The conclusion could be used to the decision-making of the density current operation.