Groundwater recharge and dynamics in northern China implications for sustainable utilization of groundwater
作者单位：Institute of Geology and GeophysicsChinese Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2013年度（第13届）学术年会》
会议日期：2014年
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]
基 金：funded by National Natural Science Foundation of China(Grants 41202183,40872162) the China Postdoctoral Science Foundation Funded Project(Grants 2012T50136,20110490581)
关 键 词：groundwater recharge groundwater age water-table decline unsaturated zone arid area water resources
摘 要：This paper reviews diffuse recharge studies in(semi)arid northern China,which are mainly based on environmental tracers of the unsaturated zone(chloride mass balance,natural tritium,artificial tritium,and bromine).Diffuse recharge in the northwestern part is commonly less than 3.6 mm/yr,where precipitation is less than 200 mm/yr and groundwater is mainly recharged by mountain *** recharge rates increase in the rain-fed Loess Plateau, ranging from 30-100 mm/yr beneath the main crop(wheat).Due to enhanced irrigation in the North China Plain,it can reach thousands of millimeters per *** to the limited recharge and sometimes thick unsaturated zone,some shallow groundwaters(e.g.,the western Ordos basin and desert area) in northwestern China are even palaeowaters (1.6-30 ka).Insufficient groundwater recharge cannot make a mass balance aquifer under present water exploitation *** unrenewable water resources has caused severe water-table subsidence(0.5-2 m/yr).Several suggestions based on the limited groundwater recharge rate and water table subsidence in northern China were proposed for groundwater sustainable utilization.