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<p>Extreme rainfall from August 4 to 6, 2023, severely impacted Ho Bon commune in Mu Cang Chai district, Yen Bai province. The event triggered a significant number of landslides and debris flows across the area. This study aims to investigate the conditions leading to shallow and large flow-like landslides in Ho Bon commune through field investigations, geological and geotechnical assessments, and statistical analysis of rainfall data. A total of 346 landslides were identified and categorized into four main types: six cases of rockfall, five cases of translational slide, 237 cases of debris flow, and 98 cases of complex landslide. Several significant characteristics were observed during this event, including (i) rainfall intensity ranking within the top 1% over the past 24 years (2000–2023); (ii) a series of shallow landslides with small to medium volumes, which occurred around 6:00–8:00 pm on August 5 and subsequently triggered large flow-like landslides in adjacent streams; and (iii) the influence of multiple contributing factors, such as intense weathering, fault zones, lineaments, high joint density, and the presence of silty sand with high hydraulic conductivity and low soil suction. In addition, human activities such as deforestation, rice paddy cultivation, and slope cutting significantly increased landslide susceptibility.</p>

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Extreme-rainfall-induced series of landslides and large flow-like landslides in Ho Bon commune, Mu Cang Chai district, Yen Bai province, Vietnam, in August 2023

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Duong Thi Toan,
  • Do Minh Duc,
  • Dinh Thi Quynh,
  • Dang Quang Khang,
  • Bui Van Dong

摘要

Extreme rainfall from August 4 to 6, 2023, severely impacted Ho Bon commune in Mu Cang Chai district, Yen Bai province. The event triggered a significant number of landslides and debris flows across the area. This study aims to investigate the conditions leading to shallow and large flow-like landslides in Ho Bon commune through field investigations, geological and geotechnical assessments, and statistical analysis of rainfall data. A total of 346 landslides were identified and categorized into four main types: six cases of rockfall, five cases of translational slide, 237 cases of debris flow, and 98 cases of complex landslide. Several significant characteristics were observed during this event, including (i) rainfall intensity ranking within the top 1% over the past 24 years (2000–2023); (ii) a series of shallow landslides with small to medium volumes, which occurred around 6:00–8:00 pm on August 5 and subsequently triggered large flow-like landslides in adjacent streams; and (iii) the influence of multiple contributing factors, such as intense weathering, fault zones, lineaments, high joint density, and the presence of silty sand with high hydraulic conductivity and low soil suction. In addition, human activities such as deforestation, rice paddy cultivation, and slope cutting significantly increased landslide susceptibility.