| Qinxigou groundwater source in Sichuan Yibin City Junlian, which abstract at the discharge area of the karst system. The protection zone of Qinxigou groundwater source is not sufficient to ensure the sustainable development and utilization of county residents safety of drinking water and karst water resources. Karst groundwater system of the Qinxigou need more research and analysis to updating existing zones, while in a targeted manner to strengthen the management of water resources and water pollution prevention planning measures are essential.From the analysis of the current research, systematic exposition of the hydrogeological research methods and water conservation zoning method is suitable for karst system, and a method of screening for the study area, but has been applied. By means of conventional hydrogeological survey a comprehensive analysis of the stream channel underground river basin district natural, meteorological, hydrological, geological, hydrogeological conditions, the use of remote sensing interpretation means further analyzed the karst hydrogeological characteristics of the study area, on the basis of the European approach It is the use of COPK vulnerability assessment model selection runoff conditions, covering conditions, precipitation conditions and the degree of development of karst tube four indicators, with layers stacked approach to the study area water groundwater vulnerability evaluation. Respectively, based on vulnerability and empirical method and empirical formula dividing water source protection zones, made comprehensive recommendations division and karst water source protection measures. Knowledge and main conclusions including:(1) In surface morphology, vegetation, erosion and tectonic signs and other imaging characteristics established interpretation signs hydrogeological remote sensing interpretation, according to landforms genesis to distinguish for dissolution landforms, and dissolution-structure landforms and erosion-dissolution landforms. According to the type of morphological divisions for the peak cluster depression, peaks valley, karst ridge, ridge-shaped karst landforms and erosion mound. The division of Qingxihou underground river basin in limestone area for weak karst developed area, medium karst development area and the strong karst development area according to the relationship between landform genesis and development degree of morphological.(2) In terms of vulnerability assessment, the European approach COP method is applicable in Southwest of China karst area, and COPK method is the special vulnerability assessment methods for karst source water s. according to the results of COP refined water vulnerable level, conducive to a more precise protection of karst aquifer.(3) Vulnerability of evaluation method and experience method and empirical formula calculation method used in combination, the method prospered to division of karst peak cluster pipeline type water source protection zones. it makes up the technical specifications of the experience method and empirical formula calculating the shortcoming of lack of scientific basis, and improve the accuracy of the delineation of protected areas by increasing the frailty of the precision grade of the evaluation data.(4) Qingxigou karst system were vulnerability assessment by COPK method. The vulnerability was classified into five grades of high, pseudo-high, medium, pseudo-low and low. Respectively according to the fragile of simple directly transformation and experience method and empirical formula calculation combination method using divided into Qingxigou water protection zones, namely protection zone I, protection zone II, protection zone III, catchment zone. The results show that the combination method is more adequate to protect the water source in the protection of the groundwater environment while protecting the groundwater environment of the underground river basin. |
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