关键词: 减脱水, 水资源安全, 岷江上游, 水电开发

Abstract:

Based on the field investigation of hydropower stations in the upper reaches of the Minjiang river and the affected reaches, we established a evaluation indicator system of the flow reducing reaches(or dried reaches), and analyzed the flow reducing(or dried) conditions of the mainstream, first tributary and second tributary of the river. According to analysis results, we discussed the relationship of the flow reducing (or dried) condition and the distance from the investigation section to the dam site, power station type, installation capacity and adjustment ability. The results show that the flow reducing reaches (or dried reaches) caused by the hydropower development is very serious in this region; discontinuous flow phenomenon of different degrees appear at all levels of the upstream tributaries, especially in the secondary tributary; and the reducing reaches (or dried reaches) is less serious as the distance from the dam site increases; the type and regulation performance of power stations are obviously related with the flow reducing reach (or dried reach), but the installed capacity has no influences. So it is necessary to take account of the impacts of power station's type and regulation performance when formulating a basin hydropower development and river ecological recovery plan.

Key words: flow reducing reaches(or dried reaches), water resources safety；upper reaches of Minjiang River, hydropower development