Rainfall as the triggering factor of landslides in the Colombian Andes

Edier Aristizábal

Departamento de Geociencias y Medio Ambiente, Universidad Nacional, Medellín, Colombia

Institute of Environmental Science and Geography, Postdam University, Germany

Multi - Geohazard setting in Colombia

Colombian population

Colombia

Source: DANE

Human exposition

Source: Aristizabal & Sanchez (2020)

Landslide in the main cities

Source: Aristizabal & Sanchez (2020)

Debris flow (lahar) --> volcano

Debris flow --> earthquake

Debris flow --> rainfall

Source: El Tiempo

Rosas (Cauca), January 8th 2023

Source: El País

Chocó, January 13th 2024

Source: El Espectador

Rainfall

Data source: satellite rainfall CHIRPS (1981-2023), Spatial Res. 5km

Thresholds

Tropical soils

Source: Aristizabal et al. (2015)

Rainfall infiltration in tropical soils

Source: Aristizabal et al. (2015)

Perched water table or Wetting front

Source: Aristizabal et al. (2015)

Rainfall & Landslides -Annual with ENSO-

Source: Aristizabal (inpress)

Rainfall & Landslides -Monthly with ENSO-

Source: Aristizabal (inpress)

Rainfall & Landslides -Daily with ENSO-

Source: Aristizabal (inpress)

Rainfall & Landslides -Hourly with ENSO-

Source: Aristizabal (inpress)

Rain gauges correlation & Rainfall intensity

Source: Aristizabal (inpress)

Rainfall & Landslide spatial distribution

low & high intensity

Source: Aristizabal (inpress)

Rainfall thresholds in Colombia

Source: Aristizabal et al. (2021)

Landslides in rural & urban areas

Source: Aristizabal (inpress)

Landslides in rural & urban areas - ENSO

Source: Aristizabal (inpress)

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