Groundwater circulation in the xianshui river fault region: A hydrogeochemical study

Zhao，Yuqing1,2,3; Zhang，You Kuan4; Yang，Yonglin5; Li，Feifei5; Xiao，Sa4

2020-12-01

10.3390/w12123310

Water (Switzerland)   影响因子和分区

2073-4441

Water samples from rainfall, river, springs, and wells in the Xianshui River fault region near Xialatuo, China were collected during two sampling campaigns to investigate the complex groundwater circulation in the region. The major ions, stable isotopes, and four natural radium isotopes of the water samples were analyzed, and the results were utilized to identify different groundwater circulation depths. Most water samples excluding the one at a hot spring and the one at a borehole possess similar hydrochemical compositions and lower total dissolved solids (TDS), implying that their circulation depth is relatively shallow or that residence time is short. The sample at the hot spring has high TDS and high temperature as well as the high F concentration, inferring that it may circulate at a deeper depth. The sample at the borehole contains mixed hydrochemical characteristics of other samples. Three groundwater flow systems may exist in the study area: the shallow groundwater system recharged by precipitations and local groundwater flow, the deep groundwater system recharged by the regional groundwater flow, and the intermediate one between the above two systems. The finding of the three flow systems is supported by the δ H and δ18O as well as the apparent radium ages of the samples. The δ H and δ O values at the intercept of the line formed by the shallow groundwater samples and the local meteoric water line (LMWL) are similar to those of modern precipitations. The δ H and δ O values at the intercept of the line formed by the deep groundwater samples and the LMWL show that it is probably recharged by relatively older precipitations. The H and O values of the borehole samples are between the above two intercept points. The deep-circulated groundwater with high temperature has longer apparent radium age than other water samples. The apparent radium ages of the shallow groundwater are similar but less than that of the deep groundwater. Groundwater at the borehole may circulate at a depth between the above two. The results of this study improve our understanding of the complex groundwater circulation and enable us to better protect and manage the groundwater resources in the region.

2 H and18 O Apparent radium age Chemical constituents Groundwater flow systems

SCI ; EI

英语

其他

China Postdoctoral Science Foundation[2018M642897] ; Guangxi Science and Technology Planning Project[GuiKE-AD18126018]

Environmental Sciences & Ecology ; Water Resources

Environmental Sciences ; Water Resources

WOS:000602804500001

MDPI

20205009603091

Isotopes ; Boreholes ; Hot springs ; Hydrochemistry ; Groundwater flow ; Groundwater resources ; Rivers ; Radium

Groundwater:444.2 ; Geochemistry:481.2 ; Geothermal Phenomena:481.3.1 ; Radioactive Materials, General:622.1 ; Fluid Flow, General:631.1

2-s2.0-85097267010

Scopus

1.Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin,541004,China
2.Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin,541004,China
3.Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology for Science and Education Combined with Science and Technology Innovation Base,Guilin University of Technology,Guilin,541004,China
4.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,518055,China
5.Survey Engineering Institute,Sichuan Earthquake Administration,Ya’an,625099,China

Zhao，Yuqing,Zhang，You Kuan,Yang，Yonglin,et al. Groundwater circulation in the xianshui river fault region: A hydrogeochemical study[J]. Water (Switzerland),2020,12(12).

Zhao，Yuqing,Zhang，You Kuan,Yang，Yonglin,Li，Feifei,&Xiao，Sa.(2020).Groundwater circulation in the xianshui river fault region: A hydrogeochemical study.Water (Switzerland),12(12).

Zhao，Yuqing,et al."Groundwater circulation in the xianshui river fault region: A hydrogeochemical study".Water (Switzerland) 12.12(2020).