基于数值模拟及可开采系数法的广花盆地地下水可开采量研究

使用数值模拟法(GMS模拟软件)及开采系数法计算广花盆地的可开采量,以合理地评价广花盆地地下水资源及可开采潜力,防止地下水过度开采及由此引发的地质灾害。结果表明:构建的地下水水流三维数值模型可为研究区提供合理的地下水水流模拟结果,在整个模拟期共730 d中,第60、180、540和730 d的标准化残差均方根分别为4. 996%、4. 043%、6. 517%、6. 787%。以可开采水位最大降深5 m作为岩溶含水层抽取水量的约束条件,数值模型计算得到的地下水可开采量为12 997. 78×104m3。采用可开采系数法计算得到的地下水可开采量为14 015. 10×104m3。两种方法的计算结果相对误差为7. 3%,两种方法相互验证,结果较为可靠,最后提出广花盆地应急备用水源地地下水管理目标及措施。

Research on groundwater allowable exploitation of Guanghua Basin based on numerical modeling and mineable coefficient method

In this paper, we use numerical modeling (Groundwater Modeling System) and mineable coefficient method to calculate the groundwater allowable exploitation amount of Guanghua basin, so as to rationally evaluate and analyze regional groundwater resources and exploitable potential, and to prevent groundwater overexploitation and the resulting geological disasters. The results show that the 3D numerical model of groundwater flow this paper constructed can provide a reasonable groundwater flow simulation result for the study area. In 730 days of the entire simulation period, the root of standardized residuals of 60th, 180th, 540th and 730th days respectively were 4.996%, 4.043%, 6.517% and 6.787%. Taking the maximum depth of water level of 5m as a constraint condition of water extraction in karst aquifers, the groundwater allowable exploitation amount is 12997.78×10⁴m³ by the numerical model calculation. The groundwater allowable exploitation amount in Guanghua basin is 14015.10×10⁴m³ with the method of mineable coefficient method. The relative error of the results calculated by numerical modeling and the mineable coefficient method is 7.3%. The two methods are verified by each other, and the results are reliable. On the basis of the above, the objectives and measures of the groundwater management for the emergency reserve water source of the Guanghua basin are put forward.