ABSTRACT
The water quality safety of long-distance water diversion project is related to the success or failure of water diversion project, and the water quality safety of water source is the basic guarantee of water quality safety of the whole water diversion project. As the principle of “pollution control before water supply, environmental protection before water use” is put forward, the identification of pollution sources and water quality prediction in the early stage of water diversion project implementation have attracted extensive attention. On the basis of analyzing the historical water quality data of the upstream basin of the water source of the Hanjiang to Weihe River valley water diversion project, this study identified the main pollution factors. Doppler current meter (ADCP) was used to measure the current river topography and velocity within 10Km of the reservoir area. Combined with the topography of the reservoir design area, a water quality model was built to predict the water quality after the reservoir was built. The results show that the water quality above the dam site and in the upper reaches of Huangjinxia Reservoir (HJXR) meets the class II surface water quality standard. The main pollution comes from the discharge of domestic sewage in Yangxian and Chenggu counties, and the water quality is relatively poor in the dry period. The simulation results show that after the completion of HJXR, the water quality has little influence on the water quality, and the water quality meets the class II surface water quality standard.
