Distribution,characteristics and influencing factors of fresh groundwater resources in the Loess Plateau,China

作     者：Hai-xue Li Shuang-bao Han Xi Wu Sai Wang Wei-po Liu Tao Ma Meng-nan Zhang Yu-tao Wei Fu-qiang Yuan Lei Yuan Fu-cheng Li Bin Wu Yu-shan Wang Min-min Zhaoa Han-wen Yang Shi-bo Wei Hai-xue Li;Shuang-bao Han;Xi Wu;Sai Wang;Wei-po Liu;Tao Ma;Meng-nan Zhang;Yu-tao Wei;Fu-qiang Yuan;Lei Yuan;Fu-cheng Li;Bin Wu;Yu-shan Wang;Min-min Zhao;Han-wen Yang;Shi-bo Wei

作者机构：Center for Hydrogeology and Environmental Geology SurveyChina Geological SurveyBaoding 071051China Southern University of Science and TechnologyShenzhen 518055China Geological Environment Monitoring Institute of Gansu ProvinceLanzhou 730050China China Institute for GeoEnvironmental MonitoringChina Geological SurveyBeijing 100081China Xi'an CenterChina Geological SurveyXi'an 710100China 

出 版 物：《China Geology》 (中国地质（英文）)

年 卷 期：2021年第4卷第3期

页      面：509-526页

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 

基　　金：This work was funded by the project of China Geological Survey(DD20190333,DD20211563) the National Youth Science Foundation(41702280). 

主　　题：Fresh groundwater Distribution pattern Climate change Human activities Hydrogeological survey engineering Loess Plateau China 

摘      要：The fresh groundwater in the Loess Plateau serves as a major source of water required for the production and livelihood of local residents and is greatly significant for regional economic and social development and ecological protection.This paper analyzes the hydrogeological conditions and groundwater characteristics in the Loess Plateau,expatiates on the types and distribution characteristics of the fresh groundwater in the plateau,and analyzes the influencing factors and mechanisms in the formation of the fresh groundwater in the plateau as a priority.Based on this,it summarizes the impacts of human activities and climatic change on the regional fresh groundwater.The groundwater in Loess Plateau features uneven temporal-spatial distribution,with the distribution space of the fresh groundwater closely relating to precipitation.The groundwater shows a distinct zoning pattern of hydrochemical types.It is fresh water in shallow parts and is salt water in deep parts overall,while the fresh water of exploration value is distributed only in a small range.The storage space and migration pathways of fresh groundwater in the loess area feature dual voids,vertical multilayers,variable structure,poor renewability,complex recharge processes,and distinct spatial differences.In general,the total dissolved solids(TDS)of the same type of groundwater tends to gradually increase from recharge areas to discharge areas.Conditions favorable for the formation of fresh groundwater in loess tablelands include the low content of soluble salts in strata,weak evaporation,and special hydrodynamic conditions.Owing to climate change and human activities,the resource quantity of regional fresh water tends to decrease overall,and the groundwater dynamic field and the recharge-discharge relationships between groundwater and surface water have changed in local areas.Human activities have a small impact on the water quality but slightly affect the water quantity of the groundwater in loess.