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A regional analysis of the role of land cover and its changes on landslide occurrence is carried out. Using a comprehensive dataset of shallow landslides that occurred from 2002 to 2020 in the Marche region (central Italy), hourly rainfall measurements, and different land cover maps, we evaluate how the triggering rainfall conditions change on different land covers. The impact of temporal changes in land cover on the occurrence of landslides is also studied. We find a relevant increase in landslide density in urban areas, a different seasonal distribution of landslides in areas with different land cover, and differences in rainfall thresholds for the initiation of slope failures. More rainfall is needed to trigger landslides in agricultural and forested areas than on artificial surfaces, as a sign of worsening stability conditions due to human activity. Forested areas are characterized by higher values of cumulated rainfall required to trigger landslides, an indication of the slope stabilizing effect of vegetation. Different rainfall triggering conditions are observed in different types of agricultural areas, indicating how agricultural practices can influence slope instability. The findings of this work are useful for territorial planning and landslide risk assessment, also in view of ongoing climate and environmental changes.

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Role of Land Cover and its Changes in Triggering Rainfall-Induced Shallow Landslides in Central Italy

  • 章节

  • 出版模式：

    开放获取

  • 发表日期：

    2025年

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  • Stefano Luigi Gariano,
  • Maria Teresa Brunetti,
  • Massimo Melillo,
  • Elisabetta Napolitano,
  • Eleonora Gioia,
  • Marco Lazzeri,
  • Gabriella Speranza,
  • Silvia Peruccacci

摘要

A regional analysis of the role of land cover and its changes on landslide occurrence is carried out. Using a comprehensive dataset of shallow landslides that occurred from 2002 to 2020 in the Marche region (central Italy), hourly rainfall measurements, and different land cover maps, we evaluate how the triggering rainfall conditions change on different land covers. The impact of temporal changes in land cover on the occurrence of landslides is also studied. We find a relevant increase in landslide density in urban areas, a different seasonal distribution of landslides in areas with different land cover, and differences in rainfall thresholds for the initiation of slope failures. More rainfall is needed to trigger landslides in agricultural and forested areas than on artificial surfaces, as a sign of worsening stability conditions due to human activity. Forested areas are characterized by higher values of cumulated rainfall required to trigger landslides, an indication of the slope stabilizing effect of vegetation. Different rainfall triggering conditions are observed in different types of agricultural areas, indicating how agricultural practices can influence slope instability. The findings of this work are useful for territorial planning and landslide risk assessment, also in view of ongoing climate and environmental changes.