IMPACTS OF THE SOUTH-TO-NORTH WATER DIVERSION PROJECTS (MIDDLE ROUTE)ON THE WATER ENVIRONMENT OF THE MIDDLE AND LOWER REACHES OF THE HANJIANG RIVER

In this paper, according to the rule of unbalanced sediment transport and the analysis of field data, different water diversion schemes were theoretically studied, including the erosion and sedimentation trend as well as their impacts on the environment of the middle and lower reaches of the Hanjiang River. The results showed that the 95×10 8m 3 water diversion scheme will cause less erosion and water level decrease than the 15×10 8m 3 water diversion scheme. Using a water diversion scheme of 95×10 8m 3, the decrease of water quantity can impact the river hydrodynamic regime substantially and the environments of the middle and lower reaches of the Hanjiang River will be greatly affected. It is therefore necessary to develop new water resources or build projects to meet the need of the environment and the needs for navigation.

基于决策环境理论的南水北调水价准市场定价模式研究

南水北调工程是极具社会公益性,又具经济效益的基础建设工程,其工程特点决定了其主要由国家投入、运营和管理,但由此带来的水价过低、水资源利用效率低下等问题,影响了整个工程水资源的可持续利用。因此,在南水北调水价管理体系中引入水市场理念,运用决策环境分析理论明确市场决策及政府决策在水价定形成中的作用;在结合工程实际的基础上,按照完全成本核算的方法,合理计入资源与环境水价,并在两部制水价的基础上进行水价调整。以"准市场"化模式来完善工程水价的形成机制和管理模式,从而实现南水北调水价机制的可持续发展及水资源的高效配置。