Environmental isotopes (delta O-18, delta H-2, Rn-222) and hydrochemical evidence for understanding rainfall-surface water-groundwater transformations in a polluted karst area

doi:10.1016/j.jhydrol.2020.125748

	Environmental isotopes (delta O-18, delta H-2, Rn-222) and hydrochemical evidence for understanding rainfall-surface water-groundwater transformations in a polluted karst area
	Qin, Wenjing 4,5; Han, Dongmei 4,5,6; Song, Xianfang 4,5,6; Liu, Shaohua 1,2,3
刊名	JOURNAL OF HYDROLOGY
	2021
卷号	592 页码:13
关键词	Surface water-groundwater interaction Rn-222, delta H-2 and delta O-18 isotopes Karst water
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2020.125748
通讯作者	Han, Dongmei(handm@igsnrr.ac.cn)
英文摘要	The vulnerable karst water systems and the serious pollution issues in Southwest China have been facing tremendous challenges, especially when controlling processes of transformation in rainfall, surface- and groundwater (SW and GW) are poorly understood in such areas. In this study, transformation processes have been identified based on physical-chemical indicators (T, DO, EC, HCO32, SO42, Ca2+, and Mg2+), delta H-2 and delta O-18 isotopes, and Rn-222 activities in different water forms. The delta H-2 and delta O-18 isotopic signals of the river are depleted in the upstream non-karst area due to the altitude effect. The karst aquifers are dominantly recharged by local rainfall in summer and by river water from the non-karst area in winter indicated by the seasonal variation of stable isotopic compositions. A Rn-222 mass-balance model was constructed to estimate GW-SW exchange during the autumn period. Net gaining and net losing sections (including a segment of conduit flow) were identified to be fluxes of 3.6 x 10 3 and 4.0 x 10 3 m(3) s (1) m (1) respectively. The bank storage water contributed critically in the net gaining section, deduced by the inconsistent responses of stable isotopic and chemical tracers to the GW influent, which resulted in a relative identical amount of influent and effluent water (5.0 x 10 (3) and 1.4 x 10 (3) m(3) s (1) m (1) respectively). In the net losing section (influent and effluent are 2.8 x 10 (4) and 4.2 x 10 (3) m(3) s (1) m (1) respectively), interactions through the segment of surface flow are sluggish, which is standing in stark contrast to the well-mixed flow in the conduit segment. The results reveal various signs of sulfides oxidation from the mine and tailings, along with liberated metals could be introduced and travelled across in the transformations of rainfall-SW-GW. It needs to put more efforts into the research of water quality and transport of metals hereafter.
资助项目	Outstanding Member Program of the Youth Innovation Promotion Association, Chinese Academy of Sciences[2012040] ; Project of China Geological Survey titled 'Comprehensive geological survey and evaluation of rocky desertification in key areas of south China'[DD20190502]
WOS关键词	HEAVY-METAL POLLUTION ; RECHARGE PROCESSES ; STABLE-ISOTOPES ; RIVER ; AQUIFER ; SOIL ; RADON ; EXCHANGE ; GUILIN ; CAVE
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000639844900023
资助机构	Outstanding Member Program of the Youth Innovation Promotion Association, Chinese Academy of Sciences ; Project of China Geological Survey titled 'Comprehensive geological survey and evaluation of rocky desertification in key areas of south China'
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/162493]
专题	中国科学院地理科学与资源研究所
通讯作者	Han, Dongmei
作者单位	1.Chinese Acad Geol Sci, Inst Karst Geol, Guilin 541004, Peoples R China 2.Minist Nat Resources, Ecosyst & Rocky Desertificat Treatment Key Lab, Guilin 541004, Peoples R China 3.Minist Nat Resources & Guangxi, Key Lab Karst Dynam, Guilin 541004, Peoples R China 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 5.Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100049, Peoples R China 6.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Qin, Wenjing,Han, Dongmei,Song, Xianfang,et al. Environmental isotopes (delta O-18, delta H-2, Rn-222) and hydrochemical evidence for understanding rainfall-surface water-groundwater transformations in a polluted karst area[J]. JOURNAL OF HYDROLOGY,2021,592:13.
APA	Qin, Wenjing,Han, Dongmei,Song, Xianfang,&Liu, Shaohua.(2021).Environmental isotopes (delta O-18, delta H-2, Rn-222) and hydrochemical evidence for understanding rainfall-surface water-groundwater transformations in a polluted karst area.JOURNAL OF HYDROLOGY,592,13.
MLA	Qin, Wenjing,et al."Environmental isotopes (delta O-18, delta H-2, Rn-222) and hydrochemical evidence for understanding rainfall-surface water-groundwater transformations in a polluted karst area".JOURNAL OF HYDROLOGY 592(2021):13.