Volume 35, Issue 3 e14093
RESEARCH ARTICLE

Identifying surface water evaporation loss of inland river basin based on evaporation enrichment model

Zhigang Sun

Zhigang Sun

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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Guofeng Zhu

Corresponding Author

Guofeng Zhu

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

Gansu Engineering Research Center of Land Utilization and Comprehension Consolidation, Lanzhou, China

Correspondence

Guofeng Zhu, College of Geography and Environment Science, Northwest Normal University, 967, East Anning Road, Lanzhou, Gansu 730000, China.

Email: [email protected], [email protected]

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Zhuanxia Zhang

Zhuanxia Zhang

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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Yuanxiao Xu

Yuanxiao Xu

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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Leilei Yong

Leilei Yong

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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Qiaozhuo Wan

Qiaozhuo Wan

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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Huiying Ma

Huiying Ma

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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Liyuan Sang

Liyuan Sang

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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Yuwei Liu

Yuwei Liu

College of Geography and Environment Science, Northwest Normal University, Lanzhou, Gansu, China

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First published: 16 February 2021
Citations: 17
Funding information Northwest Normal University; National Natural Science Foundation of China, Grant/Award Numbers: 41971036, 41867030, 41661005

Abstract

Accurately quantifying the evaporation loss of surface water is essential for regional water resources management, especially in arid and semi-arid areas where water resources are already scarce. The long-term monitoring of stable isotopes (δ18O and δ2H) in water can provide a sensitive indicator of water loss by evaporation. In this study, we obtained surface water samples of Shiyang River Basin from April to October between 2017 and 2019. The spatial and temporal characteristics of stable isotopes in surface water show the trend of enrichment in summer, depletion in spring, enrichment in deserts and depletion in mountains. The Local Evaporation Line (LEL) obtained by the regression of δ2H and δ18O in surface water has been defined by the lines: δ2H = 7.61δ18O + 14.58 for mountainous area, δ2H = 4.19δ18O − 17.85 for oasis area, δ2H = 4.08δ18O − 18.92 for desert area. The slope of LEL shows a gradual decrease from mountain to desert, indicating that the evaporation of surface water is gradually increasing. The evaporation loss of stable isotopes in surface water is 24.82% for mountainous area, 32.19% for oasis area, and 70.98% for desert area, respectively. Temperature and air humidity are the main meteorological factors affecting the evaporation loss, and the construction of reservoirs and farmland irrigation are the main man-made factors affecting the evaporation loss.

CONFLICT OF INTEREST

The authors declare no conflict of interest.

DATA AVAILABILITY STATEMENT

Data available on request from the authors The data that support the findings of this study are available from the corresponding author upon reasonable request.

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