Study On Groundwater Resources Demonstration Mode For Construction Projects In The Karst Area In Northern China

Karst Water is groundwater which is stored in fissures and tunnel caves of solubility rocks and the most common water rich types of karst areas.Karst Water is the main ground water resources used by Construction Projects of industrial water and domestic water in the Karst Area in northern China. At present, in order to support the fast development of economic and society in the Karst Area in northern China, the exploitation yield of Karst Water is becoming larger and larger, which result in the more geological disasters, for example, the declined groundwater level, the expanding funnel area, land subsidence, ground collapses, water pollution and so on. So, the job of underground water resources demonstration of construction projects in the Karst Area in northern China has become more and more important and the key topic for study.In The management methods of construction projects water resource demonstration (ministry of water resources and the national development and reform commission document 15th) and the rules of construction projects water resource demonstration (SL/Z 322-2005) had been issued by the ministry of water resources and the national development and reform commission, which marks the development water resources assessment system. This method made basis for deepening the License System Of Water Diversion, strengthening water resource management, studying Water Right Theories and water market theories, making sure initial Water Right, which are significant for water resources allocation optimization and Sustainable utilization, guaranteeing water demand of construction project, and development, utilization and administration of water resources so on.At present, water resources demonstration for construction project has some drawbacks, especially in the aspects of underground water resources demonstration of construction projects in the Karst Area in northern China where conditions of hydrological geology are complicated. In these area, analysis areas of water resources situation, development and utilization, scope of water resources demonstration, and scope of infection argumentation are not made sure simply, and it is very difficult to determine the area hydrogeology parameters, which insult in the result of allowable withdrawal of groundwater argumentation and confirming methods of the pumping well place are not reasonable.On the basis of the management methods of construction projects water resource demonstration and the rules of construction projects water resource demonstration, combining the fact and the hydrogeological condition feature of Karst area in northern China, the text studied the feature of Underground Water Resources Demonstration of Construction Projects in the Karst Area in northern China, which includes the differences of other Underground Water Resources Demonstration and especially the methods of the differences.The feature and innovation of this article is like this (1)the deciding methods of analysis areas of water resources situation, development and utilization, scope of water resources demonstration, and scope of infection argumentation in the Karst Area in northern China were studied, multiple well generalized method were studied , a fuzzy decision pattern of multilayer and multi-objective system were set up, semi-logarithm method was used, and in the end the zone hydrogeological parameters system fuzzy layer decision model were formed; (2) the water volume equilibrium method was advanced, application of water volume equilibrium method, exploitation experiment method and numerical simulation method in the permissive karst water exploitation yield assessment were used, the combined method of evaluation of Karst water exploitable yield was formed, and the choosing of all results were studied; (3) the mathematical model of karst groundwater environment quality evaluation was established by the fuzzy comprehensive evaluation method and the assessment of karst groundwater environment quality of prepared pumping wells were made up, and the hydrochemical classification of all prepared pumping wells were made up by the fuzzy clustering analysis method, various properties of groundwater, hydraulic relationships among water source sites, and correlation of supplement and discharge were studied in terms of obtained results, in the end, considering the factor of water quantity, the key technology of confining the pumping well place was formed.