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.
