Quantitative landslide hazard analyses in volcanic ashes of the Chinchiná area, Colombia | |
Autor: | Van Asch, Th.W.J. |
Otros Autores: | Blijenberg, H ; Terlien, M.I.J ; Van Westen, C. |
Tema(s): | |
Resumen: | In: Simposio Internacional sobre Sensores Remotos y Sistemas de Información Geográ fica (SIG)para el Estudio de Riesgos Naturales. Memoria. Santafé de Bogotá , Colombia. Instituto Geográ fico Agustín Codazzi (IGAC), 1992. Presentado en: Simposio Internacional sobre Sensores Remotos y Sistemas de Información Geográ fica (SIG)para el Estudio de Riesgos Naturales, 1; Santafé de Bogotá , 8-15 mar. 1992. In this paper de posibilities and limitations of a deterministic hazard assessment of landslides in ash covers in the Chinchina area are discussed. Ground water heights were analysed in relation to the input of daily rainfall, for standard sequencies of layers and standard slope profiles, by means of a two dimensional ground water model called SLOHYD. The propability that in a certain land unit a certain ground water height in the ash occurs, depends mainly on the probability that of occurrence of a layer sequence with a sufficient difference in Ks values between the ash and the underlying layers. A probability of failure in the ashes was assessed for different ground water heights. The calculation was done with an infinite slope probability model in ILWIS (AU). / CHINCHINA / CALDAS |
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Libros | Biblioteca Central Fondo general | PA | Ej. 1 | No prestable |
In: Simposio Internacional sobre Sensores Remotos y Sistemas de Información Geográ fica (SIG)para el Estudio de Riesgos Naturales. Memoria. Santafé de Bogotá , Colombia. Instituto Geográ fico Agustín Codazzi (IGAC), 1992. Presentado en: Simposio Internacional sobre Sensores Remotos y Sistemas de Información Geográ fica (SIG)para el Estudio de Riesgos Naturales, 1; Santafé de Bogotá , 8-15 mar. 1992. In this paper de posibilities and limitations of a deterministic hazard assessment of landslides in ash covers in the Chinchina area are discussed. Ground water heights were analysed in relation to the input of daily rainfall, for standard sequencies of layers and standard slope profiles, by means of a two dimensional ground water model called SLOHYD. The propability that in a certain land unit a certain ground water height in the ash occurs, depends mainly on the probability that of occurrence of a layer sequence with a sufficient difference in Ks values between the ash and the underlying layers. A probability of failure in the ashes was assessed for different ground water heights. The calculation was done with an infinite slope probability model in ILWIS (AU). / CHINCHINA / CALDAS
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