AUTHOR=Ortiz-Giraldo Laura , Botero Blanca A. , Vega Johnny 
  
TITLE=An integral assessment of landslide dams generated by the occurrence of rainfall-induced landslide and debris flow hazard chain
  
JOURNAL=Frontiers in Earth Science
  
VOLUME=Volume 11 - 2023
  
YEAR=2023
  
URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2023.1157881
  
DOI=10.3389/feart.2023.1157881
  
ISSN=2296-6463
  
ABSTRACT=Landslides caused by rainfall are one of the most frequent causes of disasters in tropical countries and mountainous terrain and can block rivers generating landslide dams. This paper presents a methodology for the estimation of the obstruction of water streams generated by rainfall-induced shallow landslides. The analyses were carried out on a tributary river of a Small Hydropower Plant (SHP). The spatial distribution of the landslide hazard was estimated in terms of the Factor of Safety (FoS) values using the deterministic method with physical basis SLIDE (Slope - Infiltration - Distributed Equilibrium). The rainfall regimes of the study area were estimated by means of a simple scaling Log Normal Model. Subsequently, the resulting areas with a high hazard level that could detach and reach the Ovejas riverbed were identified as sources for the simulation of the debris flow runout using the RAMMS simulation model with the debris flow module, estimating the zones of the riverbed that should be analyzed in detail. Finally, the effects of river channel obstructions generated after debris flow movement were analyzed by means of the IBER model and their possible changes on the river hydraulic. Our findings highlight the changes in the fluvial dynamics in the corridor of the river of analysis after the landslide dams generated by the occurrence of rainfall-induced landslide and debris flow hazard chain for the different return periods, all obstruction cases were sufficient to change the hydraulic regime of the study river corridor showing longer delay times in the transit of the flow, in addition to the decrease in the specific flow. This would imply a water shortage in the study basin of the hydroelectric project; however, in the scope of this project it is not possible to really determine the real effects that could be generated by this event.