Hydrologic Modeling Of Karst Subterranean River Using Storm Water Management Model

Karst groundwater is an evolving dynamic system and the hydrological cycle is extremely complicated. It is difficult to accurately describe the flow pattern of water flow in karst aquifer medium. Hydrological model is an effective means of study of groundwater systems and it has become a hotspot of modern Hydro-geological.This paper is guided by Earth system science, Hydrology and karst dynamics. It selects qingmuguan underground river system (rock mouth to Jiangjia spring) for the study. The geological background, were defined on the basis of collecting information and field survey. The catchment boundary, groundwater network were defined hydrologic observation and application of hydro-chemical analysis, infiltration and tracer tests. SWMM was taken as the tool to simulate hydrological processes. The preliminary study has come to several conclusions as followingSpecial technical methods must be applied to the study of karst aquifer due to its own special characteristics comparing with non-karst aquifers. With multi-tracer tests and quantitative analysis, the catchment boundary was defined. It also suggests conduit flow between Yankou swallow hole and the Jiangjia Spring. and Jiangjia Spring is the main outlet of Qingmuguan Subterranean River. It also provides the base of catchment abstraction and hydrologic modeling.The flow of Jiangjia Spring is sensitivity to the rain. Rain can quickly enter the swallow hole and supply to groundwater. It fluctuates When the rainfall intensity large. When the rainfall intensity smaller but longer duration. It lagged response to rainfall and the decline is slow. The simulation of hydrological processes in Qingmuguan with SWMM is successful. So SWMM was proved to be applicable in simulation of karst hydrologic process.