Groundwater recharge evaluation and analysis based on the INFIL3.0 model

In this paper,the improved INFIL3.0model is used to evaluate the net infiltration and potential recharge coefficient across the lower boundary of the root zone in the Shijin Irrigation District and analyze the temporal and spatial variation.The calculation results show the annual average net infiltration is 79mm and that the annual average potential recharge coefficient is 0.135in the Shijin Irrigation District.The net infiltration and potential recharge coefficient in the surface water irrigation area are both larger than those in the groundwater irrigation area,and the net infiltration and potential recharge coefficient in the area irrigated with surface water combined with groundwater are in the middle of that in the areas irrigated with surface water and groundwater.The peak of net infiltration appears in the intense rainfall period.The process of infiltration recharge is analyzed from the water balance,and it is shown that the rainfall is the main factor causing the infiltration recharge and that the current irrigation system is reasonable.