分层监测孔现场分级联合试验确定含水层参数  

Determination of Aquifer Parameters from Comprehensive In-situ Pumping and Tracing Test in the Multi-layer Monitoring Boreholes

作　　者：李亚美[1] 成建梅[1] 崔莉红[1] 路万里[1] 

机构地区：[1]中国地质大学(武汉)环境学院,武汉430074

出　　处：《南水北调与水利科技》2013年第3期132-137,共6页South-to-North Water Transfers and Water Science & Technology

基　　金：国家重点基础研究发展计划(973计划)(2010CB428802)

摘　　要：以华北平原中部咸淡水过渡带的多层含水系统(第Ⅰ含水组底部至第Ⅱ含水组顶部的含水系统)为研究对象,建立了地下水位-水质分层监测系统。通过在多层含水系统开展分层分级抽水试验、微水试验以及分层示踪试验等现场综合试验,借助解析法和数值模拟识别法等多种手段确定各分层水文地质参数。求参结果表明:Ⅰ含底部含水层渗透系数为4.320～7.550m/d,储水系数为4.53×10-4～2.19×10-3;弱透水层渗透系数为2.20×10-3～7.65×10-3 m/d,纵向弥散系数为0.023～0.428m2/d,纵向弥散度为0.010～0.051m;第Ⅱ含水层顶部含水层渗透系数为0.142～0.929m/d,储水系数为4.53×10-4～2.19×10-3。A multi-layer groundwater level-water quality monitoring system has been developed to investigate the aquifer-aquitard system that is located from the bottom of 1st aquifer to the top of 2nd aquifer, across the saltwater-freshwater transitional zone in the North China Plain. Based upon those boreboles,a series of in-situ tests have been carried out such as the pumping test, slug test,as well as tracer test in different layers. The hydrogeogical parameters in the aquifer-aquitard system have been oh- mined using the analytical method and numerical simulation method. The results show that the hydraulic conductivity and the storage coefficient at the bottom layer of 1st aquifer are 4. 320-7. 550 m/d and 4. 53 × 10^-4-2.19 × 10^-3 , respectively, the hy- draulic conductivity, the longitudinal dispersion, and the longitudinal dispersivity in the aquitard are 2. 20 × 10^-3-7.65 × 10^-3 m/d, 0. 023-0. 428 m2/d, and 0. 010-0. 051 m, respectively, and the hydraulic conductivity and the storage coefficient at the top lay- er of 2nd aquifer are 0. 142-0. 929 m/d and 4. 53×10^-4-2.19×10^-3,respectively.

关 键 词：多层含水系统 分层监测系统 抽水试验 微水试验 示踪试验 水文地质参数 

分 类 号：P641[天文地球—地质矿产勘探]