Karst Groundwater System of Longdong Underground River in Qiaojia County and Analysis of Its Recharge Relationship

Basing on the karst hydrogeological investigation of Buckwheat river basin,Qiaojia county of Yunnan,a karst water subsystems namely karst water system of longdong underground river in the whole basin is researched on its recharge relationship. That the percolation of surface water is an important origin of groundwater recharge is determined by analysis and investigation of the hydrogeological characteristics of the region in the first place. Then,sample data of the karst water system is processed by water chemistry and drawn on trilinear chart of Piper using Auto CAD software. The surface water and groundwater chemical characteristics of this karst groundwater system are analysed by the trilinear diagram. Further the relationship and connection of recharge is proven.