Examinando por Materia "Rain"
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Ítem Definición de escenarios de lahares en el volcán de Colima y análisis de susceptibilidad a inundación en la población de San Marcos, Jalisco, México(Universidad EAFIT, 2020) Pérez Hernández, Andrea; Pérez Mejía, Natalia Andrea; Capra Pedol, Lucia; Duque Trujillo, Jose FernandoLahars are a mixture of water and sediments associated with volcanic processes, they can be generated by different factors such as melting glaciers, dam’s ruptures and heavy rainfall; this last factor occurs frequently in volcanoes, where rainfall/runoff process enhance erosion on main channels generating lahars that can reach large distances from their source, causing damages on the infrastructure of surrounding populations. The present work presents rain-triggered lahar susceptibility analysis along La Arena ravine and the effect on San Marcos; a village located 14 kilometers southeast of the Colima Volcano, in Mexico, between the limits of the states of Jalisco and Colima. To define the inundation limits, the program FLO-2D was chosen to model lahars, through data of rainfall events in 2018 and 2019. Using this information, a rainfall analysis was conducted and it was possible to identify those associated with the generation of lahars and to identify different scenarios depending on the total rainfall accumulation and its maximum intensity. Three different scenarios (small, intermediate and large) were identified and simulated with the FLO-2D code to analyze the effect on the population of San Marcos. Based on the numeric simulations hazard maps were made, which were used as a tool to study and analyze the area exposed of lahar inundation, considering that the three scenarios can generate an impact to the infrastructure. Aditionally, the study zone can be affected due to events of great magnitude, such as rainfall produced by hurricane events. Likewise, a probabilistic analysis was also conducted; where the large scenario presents low probability of occurrence, since these are events with regional (hurricane) character than those for the intermediate and small scenarios (rainy season). Through the analysis of the maps here presented, the population of San Marcos presents a low-medium hazard level to floods caused by lahars.Ítem Influence of the ENSO on the spatial and temporal variability ocurrence of landslides triggered by rain in the Andean region(Universidad EAFIT, 2019-06-04) Naranjo Bedoya, Karolina; Aristizábal Giraldo, Edier Vicente; Morales Rodelo, José Alfred; Universidad Nacional de ColombiaÍtem Prediction of landslide occurrence in urban areas located on volcanic ash soils in Pereira, Colombia(Springer Verlag, 2004-01-01) Rios, D.A.; Hermelin, M.; Rios, D.A.; Hermelin, M.; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y TectónicaAs a result of the 25 January 1999 Armenia earthquake, the city of Pereira (400,000 inhabitants), located on a volcanic ash-covered alluvial fan in the western limit of the Central Cordillera (Colombia), suffered 250 slope movements. After a complete inventory, a monitoring process of unstable areas was designed, based on repeated topographic surveys, soil pore saturation levels and visual inspections. The participation of the communities was crucial and permitted the prediction of slope movements between 2 weeks and 3 months in advance and the evacuation of the inhabitants. Three specific examples are discussed. The method could be improved by excavating observation trenches and observing in detail local rainfall. In all cases, the strong involvement of the community was considered indispensable for the success of the process. © Springer-Verlag 2004.Ítem Rain(Universidad EAFIT, 2020-05-05) García Arriola, José Luis; Universidad EAFITScore for mixed choir by José Luis García Arriola