Spatiotemporal patterns of evapotranspiration in the Xiangjiang River Basin from 2000 to 2020

IF 2.7 4区环境科学与生态学 Q2 Environmental Science

Hydrology Research Pub Date : 2023-07-19 DOI:10.2166/nh.2023.143

Suxun Li, Chang-Lin Feng, Liu Yang

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引用次数: 0

Abstract

Evapotranspiration (ET) is a crucial parameter in the process of the hydrological cycle. It is of great significance for water resource management and the improvement of ecological systems in the Xiangjiang River Basin (XRB) to explore the spatial and temporal dynamic characteristics of ET. Based on MOD16, this study revealed the characteristics of spatial and temporal patterns of ET in the XRB from 2000 to 2020. We first applied land use data and change rate for overall trend analysis on ET. Then, we obtained spatiotemporal migration routes of ET through standard deviation ellipse (SDE). Furthermore, we demonstrated the effects of monsoon and urban expansion on ET change. Accordingly, we observed the following novel spatiotemporal patterns of ET: (1) while the ET of artificial surfaces decreased from 2000 to 2020, the change rate in most regions of the XRB was 8.83%, indicating that the overall trend of ET in the XRB was increasing. (2) At 10-year intervals, the SDE center of ET all migrated in a clockwise direction. (3) The correlation between precipitation and ET is more obvious than that between temperature and ET. (4) With the direct effects of monsoon on precipitation in East Asia, we found that the changes in precipitation are consistent with the ET change.

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2000～2020年湘江流域蒸散时空格局

蒸散发(ET)是水文循环过程中的一个重要参数。探讨湘江流域ET的时空动态特征，对湘江流域水资源管理和生态系统建设具有重要意义。基于MOD16，揭示了2000 - 2020年湘江流域ET的时空变化特征。首先利用土地利用数据和变化率对ET进行总体趋势分析，然后通过标准差椭圆(SDE)得到ET的时空迁移路径。此外，我们还论证了季风和城市扩张对ET变化的影响。结果表明:(1)2000 - 2020年，在人工地表ET减少的同时，青藏高原大部分区域的ET变化率为8.83%，表明青藏高原ET总体呈增加趋势;(2)每隔10年，ET的SDE中心均以顺时针方向迁移。(3)降水与ET的相关性比温度与ET的相关性更明显。(4)在季风对东亚降水的直接影响下，我们发现降水的变化与ET的变化是一致的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrology Research Environmental Science-Water Science and Technology

CiteScore

5.30

自引率

7.40%

发文量

审稿时长

17 weeks

期刊介绍： Hydrology Research provides international coverage on all aspects of hydrology in its widest sense, and welcomes the submission of papers from across the subject. While emphasis is placed on studies of the hydrological cycle, the Journal also covers the physics and chemistry of water. Hydrology Research is intended to be a link between basic hydrological research and the practical application of scientific results within the broad field of water management.