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Otero Díaz, Luis Jesús and González Rodríguez, Ernesto Mauricio. (2005). Evaluación del Efecto de la Isla Barrera El Guano frente a la Acción de Tsunamis en Tumaco. Boletín Científico CCCP (12). pp. 49-61. doi https://doi.org/10.26640/01213423.12.49_61

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Abstract

The village of San Andrés Tumaco, in Colombia, has suffer the impact of great magnitude tsunamis events, which have caused serious damage and death in the area. The last tsunami, occurred on December 12, 1979 (M 8.2), affected the population of Tumaco in particular. However, it is believed that the disaster was lessened by the existence of Guano barrier island, a littoral sand island that disappeared in the event, and located in front of city of Tumaco. In this work a comparative study of tsunami action in the Tumaco Bay is carried out, taking the present situation (without barrier island) and the situation previous to 1979 (with barrier island), in oder to consider the viability of regeberating the old Guano barrier island as a protective element for the population in this area. This analysis was carried out by means of the identification of earthquake parameters and focal mechanisms of tsunami generation in the zone, the application of a numerical model of tsunami generation and propagation and the evaluation of tsunami action on the islands of Tumaco. The results of the simulations for Tumaco showed that in the present situation, this zone is vulnerable to the impact and flood by tsunamis from a near source. It was proven that barrier island considerably reduced the energy flow and the flooding level of the tsunami waves upon Tumaco in the 1979 event. However, if this tsunami had occurred during a higher tide, the impact would have been greater. In order to reduce flooding risk due to tsunami upon the city of Tumaco, the alternative proposed in this paper is to regenerate and modify the morphology of the old Guano barrier island to provide better protection for the city.

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Item Type:	Article
Uncontrolled Keywords:	Tsunamis. Isla Barrera. Inundación. Tumaco. Pleamar. Modelo numérico. Regeneración
Geographical coverage :	Pacífico colombiano. Departamento de Nariño. San Andrés de Tumaco
Depositing User:	Dirección General Marítima
ISSN:	0121-3423
Official URL:	http://www.cccp.org.co
Identification Number:	https://doi.org/10.26640/01213423.12.49_61

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