Debris flows induced by Multiple Occurrence Regional Landslides Events in the Colombian Andes

Edier Aristizábal, Maria Isabel Arango, Federico Gómez, Manuela Álvarez, Daissy Herrera, Johnnatan Palacio

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

Edier Aristizábal, Maria Isabel Arango, Federico Gómez, Manuela Álvarez, Daissy Herrera, Johnnatan Palacio. 2021. Debris flows induced by Multiple Occurrence Regional Landslides Events in the Colombian Andes. Second International Conference on Natural Hazards and Risks in a Changing World. Potsdam (Germany).

Geohazard setting in Colombia

Risk scenario

Debris flow (lahar) --> volcano

Debris flow --> earthquake

Debris flow --> rainfall

Debris flow --> rainfall

Landslide clusters triggered by rainfall in Colombia

Landslide clusters triggered by rainfall in Colombia

Landslide clusters triggered by rainfall in Colombia

Landslide clusters triggered by rainfall in Colombia

Landslide clusters triggered by rainfall in Colombia

Landslide clusters triggered by rainfall in Colombia

Compactness coefficient (propagation)

Propagation area

Landslide density

Landslide density

The frequency-area distribution

Rainfall threshold for landslide clusters in the Colombian Andes

Antecedent rainfall influence (90 days)

Mocoa

Antecedent rainfall influence (90 days)

Mocoa

Final ideas...

• Landslide cluster triggered by rainfall is a very frequent phenomena in the Colombian Andes


• Landslide triggered by rainfall is a very complex and concatenated phenomena with a very high destruction capacity, which generate moderate and big disasters


• Much more research should be carry out in Colombia to understand this kind of landsldie clusters, to stablish early warning systems and land planning policies and reduce human and econmic losses

Thanks