Study On The Denitrification Change When The Lake Water Recharge Aquifer

This thesis is represented Wuliangsuhai lake, to investigate the seepage way, recharge function and the dentrification of the lakeshore. Soil tank had been designed and been taken to reproduction the lakeshore circumstances. The reappeared groundwater flow showed the transport way and features of the junction between the lake and the underground , the reappeared circumstances indicated the movement of the water quality.The combination of using the soil tank test and the mathematics simulation had been testified during the lake recharge the aquifer, the seepage velocity showed the regularly way in the junction zone. The velocity of the dentrification of the lakeshore had been calculated by using the Visual Modflow 4.0.When the simulation is taking place, it is necessary to build the differential equation to describe the dentrification and seepage test where the initial condition and the formation also have been under the consideration. After build the Visual Modflow 4.0, the step of correction had been taken place,the result of simulation showed in well matched . It showed the 60 days flow and concentration distributing situation by using software.The velocity of the dentrification were measured by the BaPS instrument, the result showed the velocity was different when the concentration of the nitrate were different. Both the measured and simulated hydraulic head and water quality of the stable aquifer, that affect the happening of the dentrification.Therefore, through the research aboved, the regular pattern of the affection to the dentrification both by the water movement , the quality distribution and concentration of the nitrate, have been revealed preliminary.