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Hazard Maps of Shallow Landslides Associated to Infiltration Processes in the Sapuyes River Basin
Mapas de Amenaza por Deslizamientos Superficiales Relacionados con Procesos de Infiltración en la Cuenca del Río Sapuyes
DOI:
https://doi.org/10.15446/ing.investig.v41n1.84611Keywords:
Shallow landslides, deterministic, infiltration, hazard maps, risk assessment (en)Deslizamientos superficiales, determinístico, infiltración, mapa de amenaza, evaluación de riesgo (es)
Hazard mapping of shallow landslides associated with infiltration processes at a regional scale was carried out by means of the spatial and temporal distribution of safety factor and its classification, within hazard level ranges, into cells that represent hillside units in Sapuyes river basin, located near the city of Pasto in the Nariño department. Hazard assessment follows the theoretical approaches of the Iverson model (2000), which takes into account the redistribution of underground pore pressures associated with the transient infiltration of the rain and its effects on the time and location of landslides, considering that shallow landslides are associated with periods of rain with a short duration and greater intensity. Results showed that both the pressure heads and the safety factor are valid approximations for hazard analysis at regional scale and allow observing the transient physical process involved in the development of shallow landslides.
La elaboración de mapas de amenaza por deslizamientos superficiales relacionados con procesos de infiltración a escala regional se realizó mediante la distribución espaciotemporal del factor de seguridad y su clasificación en rangos de nivel de amenaza, en celdas que representan unidades de ladera en la cuenca del río Sapuyes, situada cerca de la ciudad de Pasto, en el departamento de Nariño. La evaluación de la amenaza sigue las aproximaciones teóricas del modelo de Iverson (2000), que tiene en cuenta la redistribución de las presiones de poros subterráneas asociadas a la infiltración transitoria de la lluvia y sus efectos en el tiempo y ubicación de deslizamientos, teniendo en cuenta que los deslizamientos superficiales están asociados a periodos de lluvia de corta duración y de mayor intensidad. Los resultados mostraron que tanto las cabezas de presión como el factor de seguridad son aproximaciones válidas para un análisis de amenaza a escala regional y permiten observar el proceso físico transitorio involucrado en el desarrollo de deslizamientos superficiales.
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