济南长孝岩溶水系统地下水富集区补给源识别及其成因机制  

Identification and genetic mechanism of recharge sources in groundwaterrich area of Changxiao karst water system in Jinan City

作　　者：刘燚 康凤新 张文强 许庆宇 秦鹏 赵强 李嘉龙 崔洋 隋海波 郑婷婷 LIU Yi;KANG Fengxin;ZHANG Wenqiang;XU Qingyu;QIN Peng;ZHAO Qiang;LI Jialong;CUI Yang;SUI Haibo;ZHENG Tingting(College of Water Conservancy and Environment,Jinan University,Jinan 250022,China;College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao Shandong 266590,China;Shandong Provincial Bureau of Geology and Mineral Exploration and Development 801 Hydrogeological Engineering Geological Brigade,Jinan 250013,China;Shandong Provincial Geothermal Clean Energy Exploration and Development and Reinjection Engineering Technology Research Center,Dezhou Shandong 253072,China;Shandong Provincial Territorial Spatial Ecological Restoration Center,Jinan 250013,China;Shandong Province Lunan Geological Engineering Exploration Institute,Jining Shandong 272100,China)

机构地区：[1]济南大学水利与环境学院,济南250022 [2]山东科技大学地球科学与工程学院,山东青岛266590 [3]山东省地质矿产勘查开发局八○一水文地质工程地质大队,济南250014 [4]山东省地热清洁能源探测开发与回灌工程技术研究中心,山东德州253072 [5]山东省国土空间生态修复中心,济南250013 [6]山东省鲁南地质工程勘察院,山东济宁272100

出　　处：《地质科技通报》2024年第6期292-305,共14页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(42072331,U1906209);泰山学者工程专项经费(tstp20230626)。

摘　　要：为识别济南长孝岩溶水系统岩溶地下水富集区补给源并揭示其富水机制,利用水化学方法和自组织神经网络(SOM-KM)耦合法揭示研究区岩溶地下水补给源和空间分布规律,利用端元混合模型定量计算富水区岩溶地下水的补给源贡献比;并结合地形地貌、地质构造、地层岩性及汇水条件探究岩溶地下水富集机制。结果表明,汇集排泄区岩溶地下水与南部补给区、侧向径流区岩溶地下水和黄河水水化学特征皆具相似性,水力联系密切,指示汇集排泄区岩溶地下水接受南部山区、侧向径流岩溶地下水和黄河水三源补给,枯水期三者补给贡献率分别为75.09%、21.02%、3.89%。汇集排泄区碳酸盐岩分布广泛且裂隙岩溶发育,尤其在马集-孝里-归德一带,加之该地区岩溶地下水补给源丰富,且在岩溶地下水自东南向西北径流过程中,在北部受砂岩泥岩阻水地层的阻滞,地下水汇聚于可溶岩与非可溶岩接触带,形成地层阻滞型岩溶地下水富水构造。通过揭示长孝岩溶水系统岩溶地下水富集机制,可为后续准确计算可采资源量、济南市保泉供水提供科学支撑。[Objective and methods]In this study,the hydrochemical method and self-organized neural network(SOM-KM)coupling method were employed to identify recharge sources and reveal the water-rich mechanism in the karst groundwater-rich area of the Changxiao karst water system in Jinan City.The contribution ratio of karst groundwater recharge sources in the karst groundwater-rich area was quantitatively calculated using the end-element mixed model.The enrichment mechanism of karst groundwater is explored by combining with topography,geological structure,stratigraphic lithology,and catchment conditions.[Results]The results showed that the karst groundwater in the catchment drainage area had similar water chemistry to that in the southern recharge area,the karst groundwater in the lateral runoff area,and the Yellow River,indicating a close hydraulic connection.This implies that the karst groundwater in the catchment drainage area is recharged by three sources:The southern mountain area,the karst groundwater in the lateral runoff area,and the Yellow River.The contribution ratios of the three components are 75.09%,21.02%,and 3.89%,respectively.Carbonate rocks are widely distributed,and fissured karst is well developed in the accumulation and discharge areas,especially in the Maji-Xiaoli-Guide area.Moreover,there are abundant karst groundwater recharge sources in this area.During the runoff process of karst groundwater from southeast to northwest,it is impeded by sandstone and mudstone in the north.As a result,it accumulates in the contact zone between soluble rock and insoluble rock,thus forming impeded-type karst groundwater-rich structures.[Conclusion]Revealing the enrichment mechanism of karst groundwater in the Changxiao karst water system can provide scientific support for accurate calculations of recoverable resources and the protection of the springs in Jinan.

关 键 词：济南 长孝岩溶水系统 岩溶地下水 补给源识别 富水机制 

分 类 号：P641.2[天文地球—地质矿产勘探]