Modified drought propagation under a changing environment: A case study in the Dongting Lake basin, China

IF 4.7 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2024-10-12 DOI:10.1016/j.ejrh.2024.101986

Lina Jin , Tao Peng , Tianyi Fan , Vijay P. Singh , Qingxia Lin , Xiaohua Dong , Ji Liu , Jiali Guo , Dan Yu , Gaoxu Wang

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引用次数: 0

Abstract

Study region

Four sub-basins of the Dongting Lake basin (DLB), China.

Study focus

The “pre-post-disturbance” method was employed to assess the impact of environmental variation on propagation from meteorological drought (MD) to hydrological drought (HD) in the DLB. The study period was split into two sub-periods (i.e, the baseline and impacted periods) via breakpoints of annual runoff series. Additionally, we calculated the drought propagation characteristics in different periods using the run theory. Furthermore, based on copula function and conditional probability analysis, the transmission threshold of MD triggering HD was determined.

New hydrological insights for the region

(i) Compared with the baseline period, the severity of HD in the Li River (LR) and Yuan River (YR) increased by 0.5 % and 1.3 % during the impacted period, respectively, while that in the Zi River (ZR) and Xiang River (XR) decreased by −25.9 % and −31.6 %, respectively; (ii) Human activities have weakened the correlation between HD and MD, resulting in various patterns of propagation time in different sub-basins and seasons; (iii) As a whole, propagation threshold from MD to HD became larger during the impacted period, with an average change rate from 0.9 % to 195.5 %.

查看原文本刊更多论文

变化环境下的改良干旱传播：中国洞庭湖流域案例研究

研究区域中国洞庭湖流域（DLB）的四个子流域。研究重点采用 "前-后-扰动 "法评估环境变化对洞庭湖流域气象干旱（MD）向水文干旱（HD）传播的影响。通过年径流序列的断点，将研究期分为两个子期（即基线期和影响期）。此外，我们还利用运行理论计算了不同时期的干旱传播特征。与基线期相比，影响期漓江（LR）和沅江（YR）的干旱严重程度分别增加了 0.5 % 和 1.3 %，而资江（ZR）和湘江（XR）的干旱严重程度分别减少了 -25.(ii)人类活动削弱了 HD 与 MD 之间的相关性，导致不同子流域和不同季节的传播时间出现不同规律；(iii)总体而言，受影响期间 MD 向 HD 的传播阈值变大，平均变化率从 0.9%到 195.5%。

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

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.