Analysis Of Sediment In XiaZhai Reservoir And Its Rational Operation Mode Research

The southern mountain area part of NingXia province falls in the arid and semi-arid zone. The productivity is low and development is also slow here, and it is one of the most depressed areas in the whole country because of the water shortage and soil and water loss problem. Many reservoirs have been built from the 50's in order to develop and utilize water resource in an efficient way, which have played an important role in accelerating the economy development in this area. Because of the unreasonable operation mode, the reservoirs sedimentation is serious, which lead to the problems of inadequate use of water resource, degressive works benefit and high risk in water works operation and flood control in this area. The task of the paper is analysis the cause and trend of reservoir sedimentation based on the study of runoff characteristic, operation mode and sediment status of XiaZhai reservoir in XiJi county, so as to offer a theory basis to confirm reasonable reservoir operation mode and to perfect the design of the works, and to provide a certain guidance to solve the practice problem of other water works.The paper starts with the reservoir sedimentation, operation mode and catchment runoff characteristics. The study comprises of distributing of runoff and sediment in the catchment, the influence and trend ofsedimentation and water storage under different operation mode. The paper also advances some opinion and measures based on runoff characteristic to improve the reservoir operation, and then analyses the corresponding results.