阿富汗东部查里卡尔极端洪水事件的案例研究

IF 2.7 4区 环境科学与生态学 Q2 WATER RESOURCES Journal of Water and Climate Change Pub Date : 2023-11-10 DOI:10.2166/wcc.2023.462
Farahnaz Fazel-Rastgar, Venkataraman Sivakumar
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引用次数: 0

摘要

本文研究了2020年8月26日在阿富汗东北部和东部形成经典锋面系统的气象机制。该天气系统造成强降雨,并导致严重的山洪暴发。受暴雨影响,洪水在清晨袭击了帕尔万省的查里卡尔市,当时大多数人还在睡觉。造成150人死亡,近500所房屋被毁。本研究通过检查国家环境预测中心数据集和MERRA模型数据库来探索大气过程。从斜t对数压力图中提取的对流有效势能(CAPE)和Showalter指数的计算表明,CAPE的高值分别为2,632 J/kg和- 6.6 J/kg。这表明研究区在洪水期间具有非常极端的不稳定性。研究表明,该系统的触发主要是热力学方面、低层深辐合和局部地形方面,而不是PV流线。然而,对不同大气要素的异常气候分析和气候正常值的对比表明,天气系统中气候变化的重要性在于研究区锋面活动的增强和斜压性的增强。
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A case study of an extreme flooding episode in Charikar, Eastern Afghanistan
Abstract This work investigates the meteorological mechanisms forming a classical frontal system on 26 August 2020 in the northeast and eastern parts of Afghanistan. The weather system caused heavy rainfall and led to severe flash floods. Flooding, affected by torrential rain showers, struck mostly the city of Charikar in Parvan province early in the morning day, while most people were asleep. This caused 150 deaths, and nearly 500 houses were destroyed. This research explores atmospheric processes by examining the National Centers for Environmental Prediction dataset and MERRA Model database. The calculation of the convective available potential energy (CAPE) and Showalter index extracted from the Skew-T log-pressure diagram shows a high value of the CAPE at around 2,632 J/kg and −6.6 for the Showalter index, respectively. This presents a very extreme instability in the study area during the time of the flood. The study reveals that the triggering of this system was mostly by thermodynamical aspects, low-level deep convergence, and local topographical aspects rather than the PV streamer. However, the anomaly climate analysis for different atmospheric elements with a comparison of the climate normal values shows the importance of climate change in the weather system into a stronger frontal activity associated with stronger baroclinicity over the study area.
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来源期刊
CiteScore
4.80
自引率
10.70%
发文量
168
审稿时长
>12 weeks
期刊介绍: Journal of Water and Climate Change publishes refereed research and practitioner papers on all aspects of water science, technology, management and innovation in response to climate change, with emphasis on reduction of energy usage.
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