Vulnerabilidade associada a precipitações e fatores antropogenicos no municipio de Guaruja (SP) : periodo de 1965 a 2001 / Vulnerability associated to precipitations and anthropogenic factors on Guaruja city (Sao Paulo-Brazil) : period from 1965 to 2001

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Space and time patterns of precipitation in Guarujá were observed from 1991 to 2001 and associated with landslides, using data of the Municipal Civil Defense and local periodicals. Results were compared with another research developed for the period of 1965 to 1988 developed by the Geological Institute and the Technological Research Institute, requested by the State of Sao Paulo Government. Results showed a substantial increase of mass movements associated with pluvial episodes in the city of Gurauja in the most recent period (1991-2001): 496, against 81 in the previous period (1965-1988). Moreover, the most recent events were caused by lower daily pluviometrical rates. This situation is attributed to the alteration of natural components which promoted more stability to the area, such as vegetation and morphology, which were caused by the anthropogenic intensification (infrastructure constructions, dwelling buildings, among others). This fact had increased the instability of the area and the vulnerability of some population segments that live in the risky areas. The rainiest months, in summer (typical of tropical humid regimen), record more landslides, however the study points out the importance of the daily scale for this kind of investigations. Two case studies which induced 60 and 35 landslides events in one single day (respectively on February 19th, 1993 and March 25th, 1991) indicate that both the convective and frontal precipitations (probably associated to ZCAS) are important to trigger mass movements in the area.

ASSUNTO(S)

chuvas rain escorregamentos (geografia) climatology landslides (geology) climatic changes landslides deslizamento climatologia mudanças climaticas

ACESSO AO ARTIGO

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