摘要
我国南方岩溶区往往水文地质条件复杂,含水层的渗透性具有较强的非均一性。为探究岩溶含水层矢量渗透系数的分布规律,识别多级次岩溶水流系统的特征,利用新型地下水流速流向测量技术,在鄂西香溪河流域的典型水文地质钻孔进行了试验研究。结合地面调查、抽水试验和压水试验等方法,对流速流向测试与分析结果进行了水文地质解释及探讨。结果表明:所选典型钻孔岩溶含水层的垂向渗透系数不均一性较强,新型流速流向测量方法计算得出的渗透系数与抽水试验的计算结果相差5%;与压水试验相比,在钻孔2个不同深度的含水段,2种方法计算的渗透系数分别相差44%和2%;不同深度的地下水流向测量结果表明,钻孔在垂向上揭示了2个不同层次的岩溶水流系统。新型地下水流速流向测量与分析方法能够较准确地识别岩溶水的优势径流方向和径流层位,对于岩溶含水层渗透性非均一性的定量刻画具有良好的应用前景。
The karst hydrogeological conditions are very complex in South China,and the permeability coefficient of karst aquifer also has high heterogeneity.In order to investigate the distribution of vector permeability coefficient of karst aquifers and identify the characteristics of multiple karst flow system,a new method of measuring groundwater flow velocity and direction was tested in a typical hydrogeological borehole in the Xiangxi River basin,western Hubei Province.In addition,the hydrogeological interpretation and discussion of test results were obtained in combination with field investigations,pumping tests and packer permeability tests.The results show that the vertical permeability coefficient is highly heterogene-ous in the borehole,and the permeability coefficient calculated by this new method is 5% different from that of the pumping test.Compared with the packer permeability test,the differences of permeability coefficients calculated by these two methods in two water-bearing zones of different depths are 44% and 2%,respectively.The measurements of groundwater flow direction at different depths have proved that there are two different karst flow systems in the vertical scale.This new method can recognize the dominant flow direction and locations in the karst aquifer,which has broadened the application prospect in quantitative characterization of karst permeability heterogeneity.
作者
郭绪磊
朱静静
陈乾龙
刘伟
罗明明
周宏
Guo Xulei;Zhu Jingjing;Chen Qianlong;Liu Wei;Luo Mingming;Zhou Hong(Institute of Geological Survey,China University of Geosciences(Wuhan),Wuhan 430074,China;School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430074,China;Shanghai Xinqiu Environmental Engineering Consulting Co.LTD,Shanghai 201399,China;Karst Dynamics Laboratory of MNR,Guilin Guangxi 541004,China)
出处
《地质科技情报》
CAS
CSCD
北大核心
2019年第1期243-249,共7页
Geological Science and Technology Information
基金
国家重点研发计划课题(2017YFC0406105)
中国地质调查局项目(DD20160304)
国家自然科学基金项目(41807199)
自然资源部岩溶动力学重点实验室开放课题(KDL201702
KDL201703)
中央高校基本科研业务费专项资金资助项目(CUG170670)
湖北省自然科学基金项目(2018CFB170)
关键词
岩溶区
地下水流速和流向
渗透系数
水流系统识别
karst area
groundwater flow velocity and direction
permeability coefficient
the identification of flow systems
作者简介
郭绪磊(1992—),男,现正攻读水文地质学(地调)专业硕士学位,主要从事岩溶水文地质方面的研究工作。E-mail:guoxulei@cug.edu.cn;通信作者:周宏(1962—),男,副教授,主要从事水文地质、环境地质方面的教学与科研工作。E-mail:zhouhong@cug.edu.cn.
