Temporal and spatial distribution of the potential recharge and influencing factors in Shijin Irrigation District

In this paper,combined with GIS and RS,the INFIL3.0 model which is based on the regional water balance to evaluated potential recharge,is used to calculate the temporal and spatial distribution of net infiltration and potential recharge coefficient in the Shijin Irrigation District,and the main factors influencing potential recharge are analyzed.The model is modified to improve its applicability and realibility in irrigation area.The results show that the net infiltration and potential recharge coefficient have obviously space and temperal variability,depending on water balance process of the root zone.The potential recharge mainly occurred in the irrigated area.The potential recharge coefficient is 0.21,0.16 and 0.09 for canal,well and well-canal irrigation area,respectively.The peak of the net infiltration emerged in May and irrigated water are the main sources for groundwater recharge.The spatial and profile analysis of the potential recharge indicates that there is a large water-saving potential in the Shijin Irrigation District.