Karst water prospecting and development technology in karst peak cluster basin area，central Guizhou：A case study of groundwater pump well project in Wudang district,Guiyang

Guizhou Province is located in the mountainous area of southwest China， where the carbonate rocks are widely distributed. However， the uneven distribution of karst groundwater has brought great difficulties to the prospecting and development of karst groundwater， resulting in the lack of drinking water in some karst areas. In order to solve the problem of drinking water safety of rural people，the groundwater pumping well project in Wudang district of Guiyang City was carried out to study the karst water prospecting and development technology in karst peak cluster basin area，central Guizhou Province. Firstly， on the basis of the survey of topography， geological structure and hydrogeology in the area， the groundwater enrichment zones that may be laid out along the structure are delineated preliminarily. Secondly， the high density resistivity method was used to lay out geophysical profiles in the target area，and the trend and buried depth of the main runoff zone were identified according to the difference of electrical properties，so as to further determine the location of the well . Finally， through drilling construction and pumping test， the karst development degree and water abundance of aquifer in the area were fount out， and six wells were successfully constructed， which provided safe water source supply for local residents.The results show that karst peak cluster basin area in central Guizhou is an exposed karst area， and the main water-bearing rock groups are dolomite and calcite dolomite of Cambrian Loushanguan group， and the storage conditions of groundwater are poor. Karst is moderately developed in the area，the karst morphology is mainly dissolved fissures， local fissures， karst caves， faults and other water storage structural areas with strong water abundance，which is the groundwater enrichment area and is also the preferred location for the layout of pump well. This project has accumulated some experience for water prospecting and well drilling in similar karst water shortage area in southwest China.