| Citation: |
Wei Zhao, Yan-zhu Lin, Peng-peng Zhou, Guang-cai Wang, Xue-ya Dang, Xiao-fan Gu, 2021. Characteristics of groundwater in Northeast Qinghai-Tibet Plateau and its response to climate change and human activities: A case study of Delingha, Qaidam Basin, China Geology, 4, 377-388. doi: 10.31035/cg2021053
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Characteristics of groundwater in Northeast Qinghai-Tibet Plateau and its response to climate change and human activities: A case study of Delingha, Qaidam Basin
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Abstract
Delingha is located in the northeast margin of Qaidam Basin. Bayin River alluvial proluvial fan is the main aquifer of Delingha, in which groundwater generally flows from north to south. The hydrochemistry results showed that two different hydrochemical evolution paths formed along southeast and southwest directions, respectively. Cl-Na type groundwater was formed in front of Gahai Lake, and SO4·HCO3-Na·Ca type groundwater was formed in front of Keluke Lake. The results of deuterium (D) and 18O revealed that the groundwater mainly originated from the continuous accumulation of precipitation during geological history under cold and humid climate conditions. In addition, results of 14C indicated that the groundwater age was more than 1140 years, implying relatively poor renewal capability of regional groundwater. Moreover, our numerical modeling results showed that the regional groundwater level will continue to rise under the warm and humid climate conditions.
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References
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Wei Zhao, Yan-zhu Lin, Peng-peng Zhou, Guang-cai Wang, Xue-ya Dang, Xiao-fan Gu, 2021. Characteristics of groundwater in Northeast Qinghai-Tibet Plateau and its response to climate change and human activities: A case study of Delingha, Qaidam Basin, China Geology, 4, 377-388. doi: 10.31035/cg2021053
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Figure 1.
Geographic location of Delingha area.
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Figure 2.
Geomorphological map of Delingha area.
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Figure 3.
Hydrogeogical profile (from Zongwulong Mountain to Keluke Lake) of Bayin River alluvial proluvial fan.
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Figure 4.
Schematic diagram of sampling sites.
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Figure 5.
Ionic concentration curve of typical area.
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Figure 6.
Durov diagram of phreatic and confined water samples.
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Figure 7.
TDS distribution of phreatic and confined groundwater.
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Figure 8.
δ18O-δD relationship of surface water.
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Figure 9.
δ18O-δD relationship of groundwater.
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Figure 10.
Seasonal variation characteristics of precipitation in Delingha (1956–2013).
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Figure 11.
Seasonal variation characteristics of average temperature in Delingha (1956–2016).
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Figure 12.
Distribution of irrigation area and groundwater level rising area.
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Figure 13.
Prediction result of groundwater level rise in 2050.