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On July 10th, 2023, intense rainfall, combined with the dynamics of the river channel and slope erosion, triggered a massive landslide on the left bank of the Beas River. This landslide destroyed seven houses and partially damaged two others, along with agricultural lands and orchards. Landslides can be caused by various triggers and factors. To understand the mechanism behind this slope failure, we have analyzed maximum 1-day rainfall data for the upper Beas catchment and considered the river channel dynamics. The analysis revealed that erosion of the spur slopes by the river removed soil material, altering the stress distribution in the adjacent soil, which led to significant slope failures. These stress changes were substantial enough to disturb the static equilibrium that maintains slope stability, ultimately causing the landslide. Although river erosion was identified as a primary factor, the presence of a minor stream draining the slopes also increased infiltration. The combined effects of slope undercutting and increased infiltration contributed to the massive landslide. Additionally, channel migration analysis indicated that the river had shifted its course during the floods of 1995 and 2018, further eroding the slope base near Mahili village.

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Channel Dynamics and Slope Failures: A Case Study of Mahili Village Landslide Along the Beas River

  • 章节

  • 发表日期：

    2025年

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  • Vijendra Kumar Pandey,
  • Jeetesh Rai,
  • Rupendra Singh,
  • Nitesh Verma

摘要

On July 10th, 2023, intense rainfall, combined with the dynamics of the river channel and slope erosion, triggered a massive landslide on the left bank of the Beas River. This landslide destroyed seven houses and partially damaged two others, along with agricultural lands and orchards. Landslides can be caused by various triggers and factors. To understand the mechanism behind this slope failure, we have analyzed maximum 1-day rainfall data for the upper Beas catchment and considered the river channel dynamics. The analysis revealed that erosion of the spur slopes by the river removed soil material, altering the stress distribution in the adjacent soil, which led to significant slope failures. These stress changes were substantial enough to disturb the static equilibrium that maintains slope stability, ultimately causing the landslide. Although river erosion was identified as a primary factor, the presence of a minor stream draining the slopes also increased infiltration. The combined effects of slope undercutting and increased infiltration contributed to the massive landslide. Additionally, channel migration analysis indicated that the river had shifted its course during the floods of 1995 and 2018, further eroding the slope base near Mahili village.