干旱区生态环境知识资源中心(Arid): How does precipitation recharge groundwater in loess aquifers? Evidence from multiple environmental tracers

Arid

DOI	10.1016/j.jhydrol.2019.124532
	How does precipitation recharge groundwater in loess aquifers? Evidence from multiple environmental tracers
	Huang, Tianming 1,2,3; Ma, Baoqiang 1,4; Pang, Zhonghe 1,2; Li, Zhi 5; Li, Zhenbin 1,2; Long, Yin 1,2
通讯作者	Pang, Zhonghe
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	583
英文摘要	Characterization of the rainfall infiltration mechanism, whether piston or preferential flow, through an unsaturated zone is necessary for groundwater resource assessment and for analysis of environmental geological hazards. However, several limitations and difficulties remain in determining the infiltration mechanism in arid and semiarid areas. This study combines the evaluations of soil water infiltration characteristics, recharge rate, and determination of groundwater age at a water table in a semiarid loess tableland to examine the recharge processes. The case study is the Xifeng loess tableland in the Loess Plateau of China, which has an unsaturated zone depth of 40-75 m and an obvious 1963-3H peak at a depth of 7.5 m. According to the piston flow, the soil water infiltration velocity is 0.12-0.14 m/yr, corresponding to a recharge rate of 37-41 mm/yr, based on the 1963-3H peak and chloride mass balance method. All of the groundwater from the water table and wells is old (tritium-free), with ages ranging from hundreds of years to 20,000 years, which suggests that no rapid modern recharge has occurred since the 1950s. The chloride content of soil water in the deep unsaturated zone, with an average value of 10.8 mg/L in the unsaturated zone below 30 m, overlaps with that in groundwater, at 4.0-10.9 mg/L. The comprehensive isotopic and chemical compositions for soil water and groundwater showed that piston flow was dominant during soil water infiltration at the field scale, resulting in the delay of modern water and related solutes entering the groundwater. Combined evaluations of the unsaturated zone with those of the saturated zone and the use of multiple environmental tracers, such as Cl, Br, H-2, O-18, C-13, H-3 and C-14, can be regarded as a generic framework for studying the recharge processes in arid and semiarid areas with thick unsaturated zones at macroscopic and field scales.
英文关键词	Groundwater recharge Tritium Loess Plateau of China Unsaturated zone Groundwater age Piston flow
类型	Article
语种	英语
国家	Peoples R China ; Canada
收录类别	SCI-E
WOS记录号	WOS:000527388300044
WOS关键词	PREFERENTIAL FLOW ; UNSATURATED ZONE ; SOIL-WATER ; STABLE-ISOTOPE ; SOLUTE TRANSPORT ; MASS-BALANCE ; VADOSE ZONE ; TRITIUM ; MOVEMENT ; PLATEAU
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	西北农林科技大学 ; 中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314996
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China; 2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China; 3.Univ Calgary, Dept Geosci, Calgary, AB T2N 1N4, Canada; 4.China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China; 5.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Huang, Tianming,Ma, Baoqiang,Pang, Zhonghe,et al. How does precipitation recharge groundwater in loess aquifers? Evidence from multiple environmental tracers[J]. 西北农林科技大学, 中国科学院地质与地球物理研究所,2020,583.
APA	Huang, Tianming,Ma, Baoqiang,Pang, Zhonghe,Li, Zhi,Li, Zhenbin,&Long, Yin.(2020).How does precipitation recharge groundwater in loess aquifers? Evidence from multiple environmental tracers.JOURNAL OF HYDROLOGY,583.
MLA	Huang, Tianming,et al."How does precipitation recharge groundwater in loess aquifers? Evidence from multiple environmental tracers".JOURNAL OF HYDROLOGY 583(2020).