| 基于解析法和数值法的非稳定流抽水试验参数反演 |
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| 引用本文： | 李霞,文章,梁杏,马腾,陈晨.基于解析法和数值法的非稳定流抽水试验参数反演[J].地球科学,2017,42(5):743-750. |
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| 作者姓名： | 李霞 文章 梁杏 马腾 陈晨 |
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| 作者单位： | 中国地质大学环境学院，湖北 武汉 430074 |
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| 摘 要： | 含水层的水文地质参数是进行地下水资源计算、地下水污染防控等所必需的基础数据，结合数值模拟技术进行含水层参数反演很有必要.按照1:5万水文地质调查规范在江汉平原仙桃市杨林尾镇复兴水厂不同含水层位开展抽水试验，包括深层含水层单孔抽水试验以及浅层含水层中群孔(2孔)抽水试验.对于单孔抽水试验，应用第1类越流系统井流理论进行参数反演；对于群孔抽水试验，推导了特定综合井函数，并利用特定标准曲线匹配法和直线图解法求解了含水层参数.随后利用FEFLOW软件建立了相应数值模型，拟合了含水层参数.结果表明:浅层含水层的渗透系数变化范围为21.66~54.00 m/d，贮水率变化范围为1.28×10-5~8.00×10-4 m-1；深层含水层渗透系数变化范围为1.27~7.00 m/d，贮水率变化范围为3.90×10-6~5.00×10-6 m-1.对于深层承压含水层而言，越流补给量较大.采用数值模拟方法结合抽水试验数据求参，综合考虑了含水层结构，拟合效果好，所得结果更加可靠.
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| 关 键 词： | 江汉平原 抽水试验 解析法 数值模拟 含水层参数 水文地质 |
| 收稿时间： | 2016-11-06 |
Aquifer Parameter Estimation of Transient Pumping Test Based on Analytical and Numerical Methods |
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| Abstract: | The aquifer parameters are the necessary basis data for calculation of groundwater resources and prevention of groundwater pollution, therefore it is necessary to invert the parameters with numerical method. According to the standard of 1:50 000 hydrogeological survey, two pumping tests with single pumping well in deep aquifer and two pumping wells in shallow aquifer were conducted at Fuxing Water Works at Yanglinwei Town of Xiantao City in Jianghan plain. The theory of first kind of leakage system was adopted to estimate the parameters in deep aquifer. For the shallow aquifer, a comprehensive well function was derived and the parameters were obtained by using the special type curve matching method and straight line method. In addition, the FEFLOW software has also been used to develop a numerical model for the pumping tests. The parameters were also estimated by the numerical model associated with the pumping test data. The results indicate that the hydraulic conductivity and the specific storage coefficient of the shallow confined aquifer are 21.66-54.00 m/d and 1.28×10-5 to 8.00×10-4 m-1, respectively. The hydraulic conductivity and the specific storage coefficient for the deep confined aquifer are 1.27-7.00 m/d and 3.90×10-6 to 5.00×10-6 m-1, respectively. The leakage from the third aquitard layer is significant, which should be taken into account for the analysis of the pumping test. In this paper, the numerical model is developed to estimate the aquifer parameters associated with the pumping test data, the structure of the aquifer was considered in detail in the numerical model. The good agreement between the simulated results and the measured data indicate that the results obtained from the numerical simulation are reliable. |
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