Climate Variability & Establishment of Rainfall Threshold Line for Landslide Hazards in Rangamati, Bangladesh
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This study aims to evaluate the impact of extreme rainfall events on landslides under current and past climate scenarios. Rainfall-triggered landslides are analyzed by rainfall estimates, derived using statistics of events. It is established that recent climate changes, mainly temperature and rainfall patterns have significantly increased the rainfall-induced landslide hazards in the Rangamati district, Bangladesh. It is also observed that the temperature and rainfall of Rangamati had increased gradually during the last 40 years (1981-2021). On 13 June 2017, a series of landslides triggered by heavy monsoon rains (300 mm/24 h) occurred and killed more than 112 people in the Rangamati hill district, Bangladesh. The highest annual decade rainfall is 3816 mm, recorded in 2010-21. A relationship between causalities and the number of events has also been established. The analysis shows that both antecedent and single-day major rainfall patterns can influence sliding events. It is established that monsoonal rainfall (June-September) can significantly influence catastrophic landslide hazard events. Finally, two rainfall threshold lines for the researched area are constructed based on antecedent and single-day major rainfall occurrences, as well as the number of fatalities caused by landslides. Total rainfall of 100 mm (16.66 mm/day) during six days appears to define the minimum rainfall that has led to shallow landslides/slope failures, while 210 mm (35 mm/day) within six days appears to define the lowest rainfall that could be a cause of catastrophic landslide in Rangamati district.
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- Authors
- Khatun, M., Hossain, A. T. M. S., & Sayem, H. M.
- Affiliations
- Jahangirnagar University (BD)
- Corresponding author
- Khatun, Mahmuda
- ORCID
- Khatun, Mahmuda
- Venue
- Open Journal of Geology
- Publisher
- Scientific Research Publishing, Inc.
- Published
- 2023
- Volume
- 13
- Issue
- 09
- Pages
- 959-979
- ISSN
- 2161-7570 (ISSN-L)
- 2161-7589
- OpenAlex
- W4386781439
- Cited by
- 6
- References
- 28
- Citations by year
- 2025: 1 · 2024: 4 · 2023: 1
- FWCI
- 1.59
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Locations
- Open Journal of Geology (publishedVersion, cc-by)
- Funders
- National Aeronautics and Space Administration
- Topics
- Physical Sciences › Environmental Science › Management, Monitoring, Policy and Law › Landslides and related hazards
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
- Physical Sciences › Engineering › Mechanical Engineering › Tree Root and Stability Studies
- Keywords
- rainfall-induced landslides, rainfall thresholds, landslide hazard, heavy rainfall, climate variability, monsoon rainfall, antecedent rainfall, landslide fatalities, shallow landslides, slope failure, rainfall statistics
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