Assessment Of Sustainable Water Resources Utilization In Intra-county Of Yan'an

The intra-county water resources of Yan'an was short and has large differences in spatial and temporal distribution.The water utilization efficiency was low.Along with the swift growth in economy, the water resources shortage and water environment pollution problems were obvious serious, which severely restricted the development of social economy.The situation of water sustainable utilization was very serious.In order to achieve the object of social and economic sustainable development for intra-county with water resources sustainable utilization, on the base of summarizing and borrowing ideas from the former research results, combining with the project of intra-county water resources development and utilization in Yan'an, the paper conducted the quantitative research to the intra-county water resources and the economic development level.On this basis, by establishing water resources sustainable evaluating indicator system for intra-county water resources, the paper analyzed and evaluated the water resources sustainable degree of utilization in Baota district and Fu county, results were as follows:(1) The characters of rainfall, runoff and water resources in Yan'an were analyzed.The tendency of the water supply and utilization were concluded, considering the social economic development condition.(2) In view of the importance of water resources and the economic level in the water resources sustainable utilization, the fuzzy mathematics theory was used to establish water resources evaluation model, which applied in evaluating the intra-county water resources quantity of Yan'an.Meanwhile, took 2007 as the ordinary year, the PCA method was used to evaluate the intra-county economic level, the qualitative and quantitative result for every counties water resources abundant degree and economic level were obtained.(3)By presented the basic ideas and connotation of water resources sustainable utilization, the water resources multiplexed system and appraisal frame were established which based on Bossel's basic orientor indicators and sustainable development idea.From six aspects which consisted the survival, the energy efficiency, the freedom, the security, the adaptation and the coexists, to reflect the overall system including the water resources subsystem, the social economy subsystem and the environment subsystem's development characteristic by unification criterion measure system level of development.(4)Based on the evaluation of water resources abundance degree and economic level, the Baota district and fu county were choose as typical areas.Using the entropy method for determination of weight of evaluating indicators, the paper has comprehensively evaluated the level of water sustainable utilization from development trend, coordination and fairness during 1999 to 2007.The results showed that the levels of water sustainable utilization for two areas were enhancing gradually, but both were low during the periods.The Baota district was at a weak sustainable utilization condition; Fu county was at a unsustainable utilization condition.(5) Based on the evaluation results of typical counties, the paper pointed out the questions which existed in the process of water resources sustainable utilization in intra-county of Yan'an, and put forward the corresponding solution.