量化气候和植被变化对雅鲁藏布江流域蒸散量和溪流特征的传播效应

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2024-10-21 DOI:10.1016/j.ejrh.2024.102015

Qi Huang , Yongqiang Zhang , Congcong Li , Ning Ma

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引用次数: 0

摘要

研究区域雅鲁藏布江流域（YTRB）在 1982-2018 年间经历了降水、温度和叶面积指数（LAI）的显著增加。研究重点本研究旨在通过使用改进的水文模型（该模型结合了蒸散诊断模块）进行模拟实验，研究气候和植被变化对实际蒸散（AET）和溪流特征的传播效应。新的水文见解改进后的水文模型在模拟 YTRB 上努夏地区六个子流域的溪流、实际蒸散量和大多数溪流特征方面表现良好（例如，日溪流的纳什-苏特克利夫效率中值大于 0.72）。AET 和溪流的变化主要受降水量（P）长期增加的影响，其次是 LAI 增加的显著影响和温度增加的微弱影响。降水量和 LAI 的增加都增加了 AET，但分别对溪流造成了湿润和干燥影响。LAI 引起的蒸腾和截流蒸发量的增加部分被土壤蒸发量的减少所抵消，从而导致 AET 的微小变化。随后，当从 AET 传播到流场特征时，流场特征的变化会被放大，尤其是那些反映频率和持续时间的特征。这项研究加深了人们对气候和植被变量对 AET 和溪流特征的传播效应的理解。

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Quantifying propagation effects of climate and vegetation changes on evapotranspiration and streamflow signatures in Yarlung Tsangpo River Basin

Study region

Yarlung Tsangpo River basin (YTRB) went through significant increases in precipitation, temperature and leaf area index (LAI) during 1982–2018.

Study focus

This study aims to investigate the propagation effects of climate and vegetation change on actual evapotranspiration (AET) and streamflow signatures with simulation experiments using an improved hydrological model that couples a diagnostic evapotranspiration module.

New hydrological insights

The improved hydrological model performs well in simulating streamflow, actual evapotranspiration and most streamflow signatures in six subcatchments of upper Nuxia region of YTRB (e.g. median Nash-Sutcliffe Efficiency of daily streamflow larger than 0.72). Changes in AET and streamflow are dominated by the long-term increase in precipitation (P), followed by considerable influence from the increase in LAI and marginal influence from the increase in temperature. Increases in both P and LAI have increased AET but caused wetting and drying effects on streamflow, respectively. LAI-induced increase in transpiration and interception evaporation is partly offset by the decrease in soil evaporation, resulting in marginal changes in AET. Subsequently, changes in streamflow signatures are amplified when propagating from AET to streamflow signatures, especially for those reflecting frequency and duration. This study advanced the understanding of the propagation effect of climate and vegetation variables on AET and streamflow signatures.

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.