Examinando por Materia "MOVIMIENTOS EN MASA"

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  • Miniatura
    PublicaciónAcceso abierto
    Análisis de umbrales empíricos de lluvia para el pronóstico de movimientos en masa en el Valle de Aburrá, Colombia
    (2013-12-17) Aristizábal, E. (Edier); Gonzalez, T. (Tommy); Montoya, Juan David; Vélez, Jaime Ignacio; Martínez, H. (Hernán); Guerra, Alexánder
    Mass movements are the product of a progressive reduction of strength of slope geomaterials by human actions or natural processes, such as weathering, and triggered by external factors like rainfall or earthquakes. These events have demonstrated throughout history its destructive capacity, causing huge human and economic losses, especially in tropical and mountainous terrains, such as the Aburrá Valley. For this reason new studies on rainfall forecasting, real-time monitoring and the definition of critical rainfall thresholds have become essential tools for the implementation of early warning systems.
  • Miniatura
    PublicaciónAcceso abierto
    Sistema de alerta temprana por movimientos en masa inducidos por lluvia para el Valle de Aburrá, Colombia
    (2013-11-25) Aristizábal, E. (Edier); Gamboa, M. F. (Marco Fidel); Leoz, F. J. (Francisco Javier)
    The complex physical conditions of the Aburrá Valley coupled with high vulnerability levels led to scenarios with a high potential for human and economic losses upon the occurrence of natural phenomena such as mass movements, which represent 35 % of events occurring in the valley and 77 % of dead people. Due to these severe problems, since 2008, an early warning system for rainfall-induced landslides assisted by empirical rainfall thresfolds has been used. Early warning systems provide a rapid means for monitoring and communicating information about threats to a vulnerable community, so they are used primarily to protect lives, noting the possibility of occurrence of an event in advance, providing time to take action that can reduce the risk conditions. This paper describes the definition and model fit as well as presents the results of the validation of thresholds for the period 2004-2008.