Effect Analysis of 2000-2006 Operation of Xiaolangdi Reservoir

By the aid of effect analysis of 2000-2006 operation of Xiaolangdi Reservoir,finally indicated that from October 1999 to October 2006,the accumulative sedimentation quantity of Xiaolangdi Reservoir area gets up to 2.127 billion m3,including that at trunk stream of 1.801 billion m3 and that at branches of 0.326 billion m3.The accumulative scoured silt at reaches above Lijin at the lower Yellow River is 1.323 billion tons.Minimum bankfull discharge at major river beds of the lower Yellow River has increased from 1 800 m3/s prior to the flood season of 2002 to about 3 500 m3/s.From 2002 to 2006,the water and sediment regulation operation for five times at the reservoir has been conducted,in this way,the full line scouring at channels of main stream at downstream has been achieved.By the joint operation of Sanmenxia and Xiaolangdi reservoirs,reduce to some extent the flooding rate of floodplain and the downstream channels and alleviate the flood damage of the pepople living in the floodplain.The rational operation of Xiaolangdi Reservoir may not only ensure the lower Yellow River free of zero discharge during special dry year and improve the Ecological environment at downstream channels,but also has supplied water to other basins.From 1999 to 2006,the accumulated energy output of Xiaolangdi Reservoir Power Station is accumulatively 25.592 billion kW·h.