Northern Shaanxi Ecological Water Study

The thesis studies the eco-environmental water demand in shanBei under gnidance of principles of hydrology and enrironmental science,There are six sections in the thesis. 1) Defining the conception of eco-environmental water demand, eco-environmental water demand has been classified into some sub-kinds. And then five characters of eco-environmental water demand have been expounded, 2) According to the character of natural eco-environment in ShanBei, after resolving Hydrologycal cycle which product some adrentages or disadrentages to eco-environment have been anaysized. Looking for some ways for improving quality of eco-environment which relates to hydrological cycling and changing, in order to lead changing of eco-environment to good direction. 3) Based on differences and similarities of Eco-environmental water demand in ShanBei, the area has been sorted into three regains and seven sub-regions, by applying qualitative analysis and quantitative methematical method. Then the dirction and measure for improving eco-environmental quality in every region and sub-region have also been putforward to.