西北干旱区域城市水环境极限承载力研究

1.1 Background and research direction water resources condition is through the serious system roughly national economy is with the water resources and water environment that can keep on developping, making of society the system load the dint the analysis to become an urgent demand 国家自然科学基金资助项目结题报告7the science problem that resolve.But, now the water environment concerning theories system load the dint to not yet become, technique towards district water environment loading condition fixed amount evaluate the method hasn't established, because of the district's water environment that but difficult with technique towards development loading condition and its can keep on the exploitation method to do out the.evaluation of reasonable science, from but make the water resources make.use of with the water environmental protection programming because lack.the cowgirl to prop up but have certain of arbitrarily sex is with the blindness. Therefore, combination our country water the environment load the dint's present condition, and strongly open the exhibition water the environment to load the theories system of the dint and the evaluation.method of the practical .Coordination district of relation the development and water environment of economic society can keep on the loading to have important of science meaning with practical value.Water environment loading ability the system is a many targetses, and much change to measure, progress that water environment that the complicated system of many level of structures, on the mathematics model beg to solve the method most for the importance should for the applied artificial nerve network model and heredity calculate way the combination beg to solve superior problem to load the dint system.1.2 Main contents ① city water environment of item researches extreme limit loading dint concept;② The establishes to evaluate the city water environment the extreme limit loading the dint index sign the system; ③The uses the artificial nerve network the model and inherit the calculate way the method that combine together the solution the city water.environment the extreme limit to load the set upping of dint system the.mold with predict the problem;④Solid example application .1.3 Importance result ① city water environment extreme limit loadingdint concept:Water in the city administration magistracy, under the keeping the term of the target of certain ecosystem environment quantity,super-speed stability of social economy of the every kind of measure, city of the free from pollution environment of adoption development and city water environment diapason appearance hour, water in the city magistracy as to it's biggest support ability for having of.② city water environment extreme limit loading dint index sign system: The index sign's system seting, should to satisfy science, widespread applicability, can predict the sex, maneuverability.City water environment extreme limit loading the dint can keep on loading the mechanism with the term's key influence that evaluation index sign, this kind of index sign the factor establish the.cowgirl to include 9 contentses.③ evaluation method:Because water.environment that quantity class that each weight load the dint to have.the different quantization, and its absolute number also differ very.big.Therefore, adoption as to it's each weight proceeds to return a 国家自然科学基金资助项目结题报告8method, convenient for evaluation that handle.④ city water environment extreme limit loading dint estimate:Use the artificial nerve network the model and inherit the calculate way the method that combine together the solution the city water environment the extreme limit to load the set upping of dint system the mold with predict the problem.

我国西北干旱区域城市在西部大开发战略中占有非常重要的地位，如何在有限的水环境内承受越来越大的压力，保持可持续发展成为本学科的发展趋势，本课题以银川为典型确立该市的水环境、社会经济、人口等因素所构成的协调发展模式。建立评价水环境极限承载力下的指标体系和标准，及其与社会经济人口发展和水环境相联系的核心模式。..