基于蒸发富集模型的内陆河流域地表水蒸发损失识别,Hydrological Processes

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基于蒸发富集模型的内陆河流域地表水蒸发损失识别
Hydrological Processes ( IF 2.8 ) Pub Date : 2021-02-16 , DOI: 10.1002/hyp.14093
Zhigang Sun ₁ , Guofeng Zhu _{1,

2} , Zhuanxia Zhang ₁ , Yuanxiao Xu ₁ , Leilei Yong ₁ , Qiaozhuo Wan ₁ , Huiying Ma ₁ , Liyuan Sang ₁ , Yuwei Liu ₁

Affiliation

准确定量地表水的蒸发损失对于区域水资源管理至关重要，尤其是在水资源已经稀缺的干旱和半干旱地区。长期监测稳定同位素（δ ¹⁸ O和δ ² H）在水可以通过蒸发提供的水损失的敏感指标。本研究获得了2017年至2019年4月至10月的石羊河流域地表水样品。地表水中稳定同位素的时空特征表现为夏季富集，春季枯竭，沙漠富集和枯竭的趋势在山上。由δ的回归获得的本地蒸发线（LEL）² H和δ ¹⁸○在表面的水已经由线限定：δ ² H =7.61δ ¹⁸ O + 14.58为山区，δ ² H =4.19δ ¹⁸ -O - 17.85绿洲面积，δ ² H =4.08δ ¹⁸ -O - 18.92为沙漠地区。从山地到沙漠，LEL的坡度逐渐减小，表明地表水的蒸发量逐渐增加。山区地表水中稳定同位素的蒸发损失分别为24.82％，绿洲区域32.19％和沙漠地区70.98％。温度和空气湿度是影响蒸发损失的主要气象因素，水库建设和农田灌溉是影响蒸发损失的主要人为因素。

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

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.

更新日期：2021-03-15

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