Evaluation of groundwater resources based on MODFLOW in Hejiang karst basin
Visual numerical simulation is an important method for groundwater resource evaluation.The numeri-cal model of karst watershed in the upper reaches of Hejiang River is established by using groundwater simula-tion software MODFLOW.In this model,the karst conduit network is conceptualized by Drain module.The groundwater level data and discharge of the subterranean river in dry months are used for the model calibration.The simulation result shows the established model can finely reproduce the groundwater dynamic,the recharge and drainage relationship among different types of aquifers,and the discharge in dry months.The groundwater in simulation region is under deficit during the low rainfall period and replenished in wet season.During the simulation period,the total groundwater recharge is 3.54×108 m3 and discharge is 3.41×108 m3.The precipita-tion is the main recharge source of karst aquifer accounting for 66.0%of the total recharge.The granite fissure water and clastic-rock fissure water are the second and third recharge resource of karst aquifer with the contribu-tion proportion of 14.3%and 7.9%,respectively.Due to the fine storage of the granite fissure aquifer,the contribution of water in granite fissure aquifer to recharge karst aquifer is larger than the precipitation in dry sea-son.
karst basinMODFLOWevaluation of groundwater resourcesHejiang River
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