The 20 February 2010 Madeira Island flash-floods: VHR satellite imagery processing in support of landslide inventory and sediment budget assessment

Cristina Lira; Maura Lousada; Ana Paula Falcão; Alexandre Gonçalves; Sandra Heleno; Magda Matias; Maria João Pereira; Pedro Pina; António Jorge Sousa; Rodrigo Proença de Oliveira; António Betâmio de Almeida

Informações chave

Autores:

Cristina Lira (Fátima Cristina Gomes Ponte Lira); Maura Lousada (Maura Ferreira da Silva Lousada); Ana Paula Falcão (Ana Paula Martins Falcão Flor); Alexandre Gonçalves (Alexandre Bacelar Gonçalves); Sandra Heleno (Sandra Isabel das Neves Heleno da Silva); Magda Matias (Magda Sofia Paraíso Matias); Maria João Pereira (Maria João Correia Colunas Pereira); Pedro Pina (Pedro Miguel Berardo Duarte Pina); António Jorge Sousa (António Jorge Gonçalves de Sousa); Rodrigo Proença de Oliveira (Rodrigo De Almada Cardoso Proença de Oliveira); António Betâmio de Almeida (António Patrício de Sousa Betâmio de Almeida)

Publicado em

01/01/2013

Resumo

On 20 February 2010, an extreme rainfall episode occurred on Madeira Island, which caused an exceptionally strong flash flood and several soil slip-debris flows, producing 45 confirmed deaths and 6 persons declared missing, as well as extensive material damages. In order to understand and quantify the importance of landsliding in routing sediment through mountainous drainage, such as Madeira Islands landscape, it was essential to perform extensive landslide analysis. This study describes the methodology used to semi-automatically detect the landslides, produce the landslide inventory maps and estimate the sediment volume produced during this particular event which ranged from 217000m3 to 344000m3 and 605000m3 to 984000m3 for the Funchal and Ribeira Brava basins, respectively. These results contributed to the design and implementation of measures to prevent damages caused by landslides in Madeira Island.