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BEng, PhD Candidate, College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China. The hyporheic zone is broadly defined as a transition zone beneath and adjacent to a river, where surface water and groundwater mix. Now, I am committed to hydrodynamic simulation of Hyporheic flow which means the exchange behavior of surface water and groundwater. Based on the hyporheic flow, I will do some work on predicting pollutant diffusion behavior.