湖底沉积物渗透系数空间变异性分析  

Spatial Variability Analysis of the Permeability Coefficient of Lake Sediments

作　　者：赵贵章 谢思敏 张勃 王琳 闫静波 李鸿源 ZHAO Guizhang;XIE Simin;ZHANG Bo;WANG Lin;YAN Jingbo;LI Hongyuan(College of Geosciences and Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Collaborative Innovation Center for Efficient Utilization of Water Resources,Zhengzhou 450046,China;Ningxia Hui Autonomous Region Hydrogeological and Environmental Geological Survey Institute,Yinchuan 750011,China;Henan Science and Technology Innovation Center of Natural Resources(Groundwater Resources Investigation Monitoring Research),Natural Resource Monitoring and territorial Control in Henan Province,Zhengzhou 450016,China)

机构地区：[1]华北水利水电大学地球科学与工程学院,河南郑州450046 [2]黄河流域水资源高效利用省部共建协同创新中心,河南郑州450046 [3]宁夏回族自治区水文环境地质调查院,宁夏银川750011 [4]河南省自然资源监测和国土整治院河南省自然资源科技创新中心(地下水资源调查监测研究),河南郑州450016

出　　处：《华北水利水电大学学报（自然科学版）》2024年第5期78-84,共7页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

基　　金：国家自然科学基金面上项目(41372260);水文水资源与水利工程科学国家重点实验室“一带一路”水与可持续发展科技基金(2021490511);宁夏生态地质调查示范项目(NXCZ20220201);2019年度河南省自然资源厅科技项目(201937913)。

摘　　要：湖底沉积物垂向渗透系数在研究地下水与湖水转化关系中起着重要作用。采用竖管法测定银川清水湖24个试验点位的垂向渗透系数(K_(v)),结合颗粒分析和统计学方法分析其渗透系数的分布规律和空间变异性。为更准确地表述和分析研究区K_(v)的空间变异性,根据结果把研究区划为A、B两个分区。结果表明:K_(v)值主要分布在0.107~5.004 m/d范围内,总体呈正态分布,均值为1.995 m/d,变异系数为0.730,渗透性有中等程度的空间变异性;A区试验点K_(v)均值为0.926 m/d,明显小于B区试验点的均值3.063 m/d,且变异程度由A区向B区逐渐减小;除个别试验点外,有效粒径d_(10)与界限粒径d_(50)较大的试验点的K_(v)值相对较大,说明沉积物颗粒大小与分布情况是K_(v)值产生差异的关键因素之一;湖水与地下水的水文交互作用影响K_(v)值的大小。研究结论为清水湖湿地的湖水和地下水转换研究提供了较为科学的理论依据。The vertical permeability coefficient of lake bottom sediment plays an important role in the study of the relationship between groundwater and lake water transformation.The vertical permeability coefficient(K_(v))of 24 experimental sites in Qingshui Lake in Yinchuan was measured using the vertical pipe method.The distribution and spatial variability of its permeability coefficient were analyzed by particle analysis and statistical method.In order to more accurately describe and analyze the spatial variability of K_(v) in the study area,the study was divided into two zones A and B according to the results.The results are as follows.The K_(v) value is mainly distributed in the range of 0.107~5.004 m/d.The overall distribution is normal,with a mean of 1.995 m/d and a coefficient of variation of 0.730.There is moderate spatial variability in permeability.The average K_(v) of the test site in zone A was 0.926 m/d,which was significantly lower than the average K_(v) of the test site in zone B was 3.063 m/d,and the variation degree gradually decreased from zone A to zone B.With the exception of a few test sites,the K_(v) values of the larger test points with effective particle size d 10 and boundary particle size d_(50) are relatively large.This indicates that the size and distribution of sediment particles are one of the key factors contributing to the difference in K_(v) values.The hydrological interaction between lake water and groundwater affects the magnitude of K_(v) value.The research provides a scientific theoretical basis for the study of the conversion of lake water and groundwater in Qingshuihu wetland.

关 键 词：垂向渗透系数 空间变异性 竖管法 颗粒分析法 

分 类 号：P641[天文地球—地质矿产勘探]