Numerical simulation of karst groundwater in Huixian wetland
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Abstract:
The core area of Huixian karst wetland is selected as the research object. Based on the geological and hydro geological conditions of the research area, the concept model of hydrogeology is generalized. Using Visual MODFLOW software, the distribution characteristics of groundwater in the Huixian wetland are simulated. The model identification, and verification showed that the simulated water level and the observed water level achieved a good fitting effect. Based on the simulation results, the dynamic change of groundwater in the research area is analyzed, and the water balance in each simulation period is calculated. The results show that: the g roundwater in the study area is generally decreasing from north to south, the groundwater level in the northern recharge area is highest, the groundwater level in the southwest drainage area is the lowest, and the average difference between the north and the south groundwater level is 7.34 m, respectively; the dynamic change of water level is greatly affected by rainfall intensity , showing obvious seasonal change rule; in the southern part of the pond, Mudong lake, and other drainage zones, the water supply is sufficient , and the underg ro und water is under control; the variation range of water level is not more than 1 m, and the variation range of water level in the northern recharge area is more than 3 m, the total recharge amount of groundwater in the simulation period is 442. 729 2 million m3 / a, after water balance calculation, of which the rainfall infiltration.recharge accounts for 76.85% , the total discharge of gro undw ater is 427.306 million m3 / a, and the exploitation and evaporation of groundwater account for 33.86% and 36.63% respectively ; the study area is generally in a positive equilibrium state in the simulation period, and the degradation of wetland directly affects flood control, storage capacity , water conservation, and water storage capacity , which refelcts the phenomenon of " excessive drought in drought periods and excessive waterlogging during floods" .
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