基于地下水动态和经验模型的巴丹吉林沙漠潜水蒸发量级——以苏木吉林湖区为例

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  • (兰州大学资源环境学院,冰川与沙漠研究中心,甘肃兰州730000)

收稿日期: 2019-12-23

  修回日期: 2020-03-26

  网络出版日期: 2020-12-16

基金资助

国家自然科学基金重点项目(41530745)资助

Magnitude of groundwater evapotranspiration in the Badain Jaran Desert based on groundwater dynamics method and empirical model:A case study of the Sumujilin Lake Area

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  • (College of Earth and Environmental Sciences, Center for Glacier and Desert Research, Lanzhou University, Lanzhou 730000, Gansu, China)

Received date: 2019-12-23

  Revised date: 2020-03-26

  Online published: 2020-12-16

摘要

为确定巴丹吉林沙漠腹地湖区潜水蒸发对地下水排泄的贡献量级,以沙漠腹地的苏木吉林湖区为研究区,使用高分辨率影像、DEM和实测的地下水埋深提取了研究区湖泊水面、不同类型植被区及不同地下水埋深区的范围,基于地下水动态信息法和潜水蒸发经验模型分别计算了植被覆盖区和裸地的潜水蒸发量。结果表明:(1)同时期内芦苇观测点潜水蒸发量大于芨芨草-白刺观测点,且两者分别在生长中期、前期达到峰值。(2)同等大气蒸发条件下,苏木吉林湖区有植被覆盖的潜水蒸发总量比无植被覆盖条件下多16%~18%,仅使用裸地潜水蒸发经验模型计算会产生较大误差。(3)苏木吉林湖区潜水蒸发总量占湖区地下水排泄总量的11.3%~13.2%,证明潜水蒸发是巴丹吉林沙漠湖区水量平衡研究中不可忽略的关键因素之一。

本文引用格式

张文佳, 王乃昂, 于昕冉, 牛震敏, 赵力强 . 基于地下水动态和经验模型的巴丹吉林沙漠潜水蒸发量级——以苏木吉林湖区为例[J]. 干旱区研究, 2020 , 37(5) : 1215 -1222 . DOI: 10.13866/j.azr.2020.05.14

Abstract

The Sumujilin Lake Area was taken as a study case to determine the contribution of evapotranspiration to groundwater drainage in the Badain Jaran Desert hinterland. Using high- resolution remote sensing image, digital elevation model (DEM), and field- measured groundwater depth, we extracted the ranges of lake water surface, different types of vegetation coverage areas, and groundwater depth hierarchic areas in the study area. Meanwhile, the evapotranspiration of vegetation coverage area and bare land wererespectively calculated on the basis of the groundwater dynamic method and the groundwater evapotranspiration empirical model. The results showed that the evapotranspiration from the Phragmites australis observation area is larger than that from the Nitraria tangutorum- Achnatherum splendens observation area during the same period. There are differences in the evapotranspiration patterns of the two types of observation areas. The former reaches the peak of the evapotranspiration rate during the middle stage of the growing season, whereas the latter reaches the peak during the early stage. Under the same atmospheric conditions, the total amount of groundwater evapotranspiration with vegetation cover in the Sumujilin Lake Area during the growing season is 16% to 18% more than that without vegetation coverage. Therefore, using only bare land groundwater evapotranspiration formulas or models to calculate the groundwater balance of the lake basin would produce large errors. Finally, the total amount of groundwater evapotranspiration in the Sumujilin Lake Area, including vegetation coverage and bare zone with shallow groundwater depth, accounts for 11.3% to 13.2% of the total groundwater drainage in the lake area, which proves that groundwater evapotranspiration is one of the key items of the water cycle of Badain Jaran Desert lakes and could not be negligible in the water balance studies.

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