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<p>Bangladesh’s coastal regions face increasing climate-related risks, yet there remains a critical gap in understanding recent changes in precipitation extremes and their implications for disaster management. This study evaluates spatiotemporal changes in precipitation extremes across Bangladesh’s coastal areas from 1991 to 2022. Using RClimdex software and the Mann–Kendall test, this study analyzed rainfall data from 12 meteorological stations, focusing on seasonal and annual trends, as well as extreme precipitation indices. Results reveal complex variations across eastern, central, and western coastal zones, with annual precipitation trends ranging from –14.13 to 8.14 mm/yr. Seasonal analysis showed predominantly negative trends in the pre-monsoon, monsoon, and dry seasons, while post-monsoon seasons exhibited mostly positive trends. Extreme precipitation indices, including consecutive dry days and maximum 1-day and 5-day rainfall, generally increased. Significant correlations between extreme precipitation indices and flood events were observed, particularly in Cox’s Bazar. The study also found the relationship between elevation and precipitation trends, with higher elevations showing decreasing trends. These findings provide crucial insights for developing targeted climate adaptation strategies, suggesting the need for region-specific flood management policies and elevation-based disaster risk reduction measures in Bangladesh’s coastal areas.</p>

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Analysis of rainfall patterns and modulations of extreme climatic indices along the coastal zones of Bangladesh

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Maliha Ali,
  • Md Khairul Amin,
  • G M Jahid Hasan

摘要

Bangladesh’s coastal regions face increasing climate-related risks, yet there remains a critical gap in understanding recent changes in precipitation extremes and their implications for disaster management. This study evaluates spatiotemporal changes in precipitation extremes across Bangladesh’s coastal areas from 1991 to 2022. Using RClimdex software and the Mann–Kendall test, this study analyzed rainfall data from 12 meteorological stations, focusing on seasonal and annual trends, as well as extreme precipitation indices. Results reveal complex variations across eastern, central, and western coastal zones, with annual precipitation trends ranging from –14.13 to 8.14 mm/yr. Seasonal analysis showed predominantly negative trends in the pre-monsoon, monsoon, and dry seasons, while post-monsoon seasons exhibited mostly positive trends. Extreme precipitation indices, including consecutive dry days and maximum 1-day and 5-day rainfall, generally increased. Significant correlations between extreme precipitation indices and flood events were observed, particularly in Cox’s Bazar. The study also found the relationship between elevation and precipitation trends, with higher elevations showing decreasing trends. These findings provide crucial insights for developing targeted climate adaptation strategies, suggesting the need for region-specific flood management policies and elevation-based disaster risk reduction measures in Bangladesh’s coastal areas.