华南地区典型花岗岩海岛地下水资源综合评价  

COMPREHENSIVE EVALUATION OF GROUNDWATER RESOURCES IN TYPICAL GRANITE ISLANDS IN SOUTH CHINA

作　　者：赖建华 唐常源[1] 曹英杰 刘广立[2] 钟驰骋 LAI Jianhua;TANG Changyuan;CAO Yingjie;LIU Guangli;ZHONG Chicheng(School of Geography and Planning,Sun Yat-sen University,Guangzhou 510006,China;School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou 510006,China)

机构地区：[1]中山大学地理科学与规划学院,广州510006 [2]中山大学环境科学与工程学院,广州510006

出　　处：《环境工程》2022年第2期59-65,198,共8页Environmental Engineering

基　　金：国家重点研发计划项目“海岛抽水蓄能电站环境影响评估与生态修复关键技术研究”(2017YFB0903703)。

摘　　要：海岛水资源供需矛盾日益显著。综合运用地球物理勘探、水文地质钻探及同位素示踪分析对广东省珠海市万山岛的推船湾库区开展地下水资源可调蓄性和可再生性评价工作。通过高密度电阻率法和水文地质钻探法揭示库区地层结构,发现松散沉积物含水层在空间上分布不连续,与裂隙含水层共同构成该区地下水主要含水层,基岩层构成隔水底板;松散沉积含水层的渗透系数为8.30×10^(-3)cm/s,给水度为0.32;裂隙含水层的渗透系数为2.52×10^(-5)cm/s,给水度为0.10;推船湾库区含水层的地下水储存量约为14873 m^(3),储水空间较大。利用同位素示踪确定降水是地下水的主要来源,通过径流分割确定地下水补给量为145065 m^(3)/a,地下水更新周期约为37 d,表明库区地下水补给条件较好,具有可再生性。研究结果为解决花岗岩海岛地下水资源勘探和管理提供了技术参考。The contradiction between the supply and demand of water resources of the islands has become increasingly prominent. This study comprehensively used geophysical prospecting, hydrogeological drilling and isotopes tracing analysis to evaluate the storability and reproducibility of groundwater resources in the Tuichuanwan reservoir area of Wanshan Island, Zhuhai, in Guangdong Province. The hydrogeological structure of the Tuichuanwan reservoir area were revealed by the methods of high-density resistivity and the hydrogeological drillings, and we found that the loose sediment aquifer was spatially discontinuous, which together with the fractured aquifer, constituted the main groundwater aquifer in the area. And the bedrock layer constituted the water-proof floor. The permeability coefficient of the loose sedimentary aquifer was 8.30×10^(-3)cm/s and the specific yield was 0.32;the permeability coefficient of the fractured aquifer was 2.52×10^(-5)cm/s and the specific yield was 0.10. The groundwater storage capacity of the aquifer was approximately 14,873 m^(3), indicating a large water storage space. Precipitation was found to be the main source of groundwater using isotopes tracing. The recharge was determined to be 145,065 m^(3)/a through runoff segmentation, and the renewal cycle of groundwater was about 37 d, indicating that the groundwater in the reservoir was reproducible and had an excellent recharge condition. This paper could provide technical ideas and references for exploration and management of groundwater resources in granite islands.

关 键 词：高密度电法 水文地质钻探 花岗岩岛屿 氢氧稳定同位素 大万山岛 

分 类 号：P641.8[天文地球—地质矿产勘探]