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基于MODFLOW-CFP的岩溶水模型降雨非线性入渗补给研究——以湖南省香花岭地区为例
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引用本文:杨郑秋,杨杨,邵景力,苏春田,崔亚莉,罗飞.基于MODFLOW-CFP的岩溶水模型降雨非线性入渗补给研究——以湖南省香花岭地区为例[J].中国岩溶,2019,(5):691-695. YANG Zhengqiu,YANG Yang,SHAO Jingli,SU Chuntian,CUI Yali,LUO Fei.Study on non-linear rainfall infiltration recharge of numerical karst water model based on MODFLOW-CFP:A case study of Xianghualing area, Hunan Province[J].Carsologica Sinica,2019,(5):691-695.
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杨郑秋 北京师范大学北京 100875 
杨杨 中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室广西 桂林 541004 
邵景力 中国地质大学(北京)北京 100083 
苏春田 中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室广西 桂林 541004 
崔亚莉 中国地质大学(北京)北京 100083 
罗飞 中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室广西 桂林 541004 
基金项目:国家自然科学基金项目(41502252);中国地质调查局地质调查项目(DD20160303、DD20160301)
中文摘要:利用MODFLOW-CFP建立湖南省香花岭渗流-管道流耦合模型,并使用降雨量系数法实现非线性入渗过程,以探讨此方法在模型中的适用性。通过人工试错反演参数,得出6个不同降雨强度区间的降雨量系数;非线性入渗处理后,地下河流量模拟结果的纳什系数提高至0.91。结果表明:降雨量系数法可使该模型更好地模拟地下河流量变化,此方法也适用于一些岩溶小流域的数值模拟工作。
中文关键词:岩溶水  数值模拟  MODFLOW-CFP  非线性降雨入渗
 
Study on non-linear rainfall infiltration recharge of numerical karst water model based on MODFLOW-CFP:A case study of Xianghualing area, Hunan Province
Abstract:Carbonate rocks are widely distributed in southwest China, and these strata constitute sophisticated karst aquifers, which are local important water and tourism resources. However, groundwater system has strong heterogeneity there, which makes it difficult to characterize subterranean runoff. At the same time, the characteristic that the karst aquifer can be recharged by rainfall infiltration through different ways has not been considered in most of the numerical simulation work. The study of karst groundwater and solute transport plays a key role in the development and utilization of karst groundwater and in the prevention and control of pollution. The purpose of this study is to discuss the relationship between rainfall intensity and rainfall recharge infiltration coefficient in the numerical model, and to use practical method to deal with the variation of coefficient to make the simulation more accurate. The Xianghualing area is located in Chenzhou City of Hunan Province, with low latitude. The aquifer in the study area is composed of Carboniferous limestone. It is a relatively independent karst basin surrounded by mountains with an area of about 14km2, and the surface is covered by luxuriant vegetation. The average annual temperature is 17.9 °C. The annual rainfall ranges from 1,000 mm to 2,400 mm, but most of the rainfall events usually occurs in summer, and there are often rainstorms between July and October. The groundwater level fluctuates with the change of rainfall conditions, and the groundwater table is too low in most areas that the evaporation barely exists. The main artificial extraction of groundwater are mine drainage, the drainage tunnel intersects with the underground river in the discharge area. According to the binary theory of karst system, the karst aquifer can be generalized into two subsystems. The fissure can be generalized into the equivalent porous media system recharged by diffuse infiltration. It is assumed that the groundwater moves in the form of seepage. Underground rivers and karst large-size passages are generalized as conduit system recharged by point infiltration, where is the main discharge pathway of karst groundwater system. MODFLOW-CFPM1 was used to develop the equivalent pore-conduit coupling model in Xianghualing, and its CRCH module was used to simulate the centralized point infiltration. Then the nonlinear infiltration process was represented by rainfall coefficient method and its applicability in the model was well discussed. Depend on data size, six rainfall coefficients of different rainfall intensity intervals were set up and obtained by artificial trial-and-error inversion parameters. After the nonlinear infiltration treatment, the Nash coefficient of the simulation results of underground river flow is increased to 0.91. The results turn out that the rainfall coefficient method can make the model better simulate the change of underground river discharge, and the method is also suitable for the numerical simulation of some karst small watershed.
keywords:karst water, numerical simulation, MODFLOW-CFP, non-linear rainfall infiltration recharge
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