Experimental Study On The Scouring Funnel In Front Of The Dam Of Aertashi Reservoir

In order to keep the power plant―the clear front‖to reduce coarse sand throughthe hydraulic turbine and prevent clogging the dam gates, we should study the scourfunnel shape before the intake station. In this paper, Aertashi reservoir as theresearch object, for different operating conditions of the reservoir, we studied thescouring effect of desilting tunnel, studied the scour funnel shape and sluicing sandduration so on.First, we established the test model of Aertashi reservoir, which meet thegeometric similarity, the water flow similarity and the sand scour deformation. As anormal model, its model scale ratio was1:150. Second, in the flood season, thereservoir water level1770m run to keep sediment, we have studied the scour funnelshape with its split ratio was1:0.73,1:1.13,1:1.56,1:3.13,0:695.8and proposeddischarge flow and sluicing sand duration to maintain power tunnel " the clear front".Studies have shown that close power tunnel, open1#desilting tunnel with itsmaximum flow695.8m3/s, flushing lasted16h, and the formed scour funnel meet―the clear front‖of the power tunnel. Third, in the non-flood season, the reservoirwater level1820m run to keep sediment, we have studied the scour funnel shapewith its split ratio was1:0.70,1:1.39,1:2.09and proposed discharge flow and sluicingsand duration to maintain power tunnel " the clear front". Studies have shown thatopen two power tunnel, open1#desilting tunnel with its maximum flow928.6m3/s,flushing lasted14h, and the formed scour funnel meet―the clear front‖of the powertunnel. Fourth, the research results and test results of similar projects were comparedwith experimental results show that this is reasonable.