The Law Of Triassic Karst Water Solute Transport In Dehou Reservoir, Wenshan Prefecture, Yunnan Province

Groundwater is essential natural resources to human, with frequent human activities, as a short term non-renewable resources groundwater frequently contaminated and damaged. With gradually increasing situation of groundwater pollution, prediction and prevention of groundwater pollution have gradually become a hot topic in the international scientific community. This paper combined with the actual project groundwater evaluation of environmental impact of Dehou reservoirs to research the environmental impact on Triassic karst groundwater which caused by the main sources of pollution Dehou reservoir within the scope of the watershed numerically.Based on previous data on the full collection, through extensive field investigation and special hydrogeological investigation I expound systematically the geological setting, geological structure, type of aquifer group, hydrogeological conditions of Dehou reservoir. I combined with the above conditions and concluded that three residue plants are the main pollution source of reservoir Dehou, so I carried out a detailed hydrogeological drilling and hydrogeological tests and water samples detection to these three residue plants. I combined with the geological field surveys to calculate the data obtained by hydrogeological test in slag plant and acquire the permeability coefficient obtained in the region, hydrogeological parameters related to diffusion coefficient, rainfall infiltration coefficient. Through by the statistical analysis for measurement data of karst depression and fissure, I concluded regular pattern that the dominant direction of fissures and the karst depressions are consistent and I summarized the permeability tensor that located in the study area of reservoir Dehou is a supine oval sphere, as the guiding ideology of "the permeability tensor" theory to applied the relevant hydrogeological parameters.Pollution status of three main pollution plants area are analyzed by sample examination. And using MODFLOW and MT3D modules of GMS software to simulate groundwater flow field and pollutant solute transport, and then adjusting the simulation results with the current situation to ensure the accuracy of the simulation. This paper quantitatively describe the distribution of the pollution sources and the extending scope of the plume and systematically analysis the regular pattern of solute transport in the Triassic karst groundwater contaminants, and provide a frame of reference for the environmental impact of the construction of Dehou reservoir.