A novel daily-scale index for detecting drought-flood abrupt alternation events: Proof from Pearl River Basin, China

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES Atmospheric Research Pub Date : 2024-12-24 DOI:10.1016/j.atmosres.2024.107892

Chengguang Lai , Yuxing Wang , Yuxiang Zhao , Zhaoli Wang , Xushu Wu , Xiaoyan Bai

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Abstract

As a serious compound disaster, the drought-flood abrupt alternation (DFAA) has become consensus and is urgent to be analyzed. Previous studies have mainly focused on the monthly time scale, making it difficult to reveal the detailed variation characteristics of DFAA. To address this limitation, this study proposed a daily-scale method that combines narrow and generalized DFAA intensity to identify, screen, and evaluate DFAA phenomena. Taking the Pearl River Basin (PRB) as an example, the results obtained through the new method demonstrate good agreement with the observed reality. The DFAA events mainly occurred in the west, east and southeast of PRB, and their frequency, coverage, intensity and average duration exhibit a significant upward trend, while the maximum duration shows an insignificant downward trend. Generally, the proposed method offers a clear representation of the evolution of DFAA events, and enables comprehensive analysis and comparison of DFAA events within the same watershed, thereby promoting a deeper understanding of DFAA on a broader temporal scale.

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一种检测旱涝突变事件的日尺度指数：来自珠江流域的证据

旱涝突变作为一种严重的复合型灾害，已成为人们的共识，也是亟待研究的问题。以往的研究主要集中在月时间尺度上，难以揭示DFAA的详细变化特征。为了解决这一局限性，本研究提出了一种结合狭义和广义DFAA强度的日尺度方法来识别、筛选和评估DFAA现象。以珠江流域为例，新方法得到的结果与实际观测结果吻合较好。DFAA事件主要发生在PRB的西部、东部和东南部，其频次、覆盖范围、强度和平均持续时间呈显著上升趋势，而最大持续时间呈不显著下降趋势。总的来说，该方法能够清晰地描述DFAA事件的演变，并能够对同一流域内的DFAA事件进行全面的分析和比较，从而促进在更广泛的时间尺度上对DFAA的更深入的理解。

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来源期刊

Atmospheric Research 地学-气象与大气科学

CiteScore

9.40

自引率

10.90%

发文量

460

审稿时长

47 days

期刊介绍： The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.