GROUNDWATER SIMULATION MODEL FOR BAOHE RIVER IN THE UPPER REACHES OF BAIYANGDIAN LAKE BASED ON GROUNDWATER SIMULATION SOFTWARE (GMS)

The Baohe River is located in the upper reaches of the Baiyangdian Lake and it is the only route for the South-to-North Water Diversion Project to replenish water to the Baiyangdian Lake. This paper took the river reach from the outlet of the Baohe Reservoir to the Baiyangdian Lake as the study area, and established a GMS model by collecting hydrogeological data of the study area. The simulation results of the groundwater model showed that, the total groundwater recharge of the study area in 2018 was 11 737.20 x 10(4) m(3), and the total groundwater discharge was 9681.51 x 10(4) m(3), generally, it was in a positive equilibrium state. Among the recharge measures, rainfall infiltration and field infiltration accounted for the largest proportion, 63.61%; among the discharge measures, artificial extraction accounted for the largest proportion, 91.95%. The recharge-discharge difference calculated by the GMS model was 2055.69 x 10(4) m(3); in 2018, the water storage change in the study area was 2262.70 x 10(4) m(3), the absolute balance error was -207.01 x 10(4) m(3) , and the relative balance error was -1.76%. The simulation accuracy of the GMS model had met the simulation requirements. This study provides a theoretical reference for the South-to-North Water Transfer Project to replenish water to the Baiyangdian Lake, which is of great significance to the restoration of the ecological environment in the Xiong'an New Area of China.