Quantitative Research on Groundwater Recharge in Mountain Area of North Sichuan

It's difficult to quantify groundwater recharge for the groundwater resources and pollution prevention study in the mountain area in North Sichuan Province. This paper studied on the representative mountain hydrographic sub-basin in the north bank of Pingxihe river, based on the route monitoring borehole, and carried out dynamic monitoring of groundwater level and temperature, the water table of the groundwater monitoring data were corrected by atmospheric pressure monitoring data, the variation characteristics of groundwater level and temperature during the year were analysed, and the space permeability coefficients of aquifer were obtained by seepage test and hydraulic test with double packer. Based on the law of Darcy Setion, the quantitative groundwater recharge of the section was calculated; the function of momthly rainfall and precipitation infiltration coefficient were established. The results show that the annual average precipitation recharge of the study area is 16.61mm/a, and the average precipitation infiltration coefficient is 0.0182; with a power function of the monthly rainfall and precipitation infiltration coefficient.