Avaliação do efeito orográfico na pluviometria de vertentes opostas da Ilha de São Sebastião (Ilhabela-SP) / Evaluation of orographic effect in the rainfall/precipitation of opposite slopes of São Sebastião Island (Ilhabela - SP)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In order to provide data for the evaluation of rainfall differences on the continental and sea slopes of São Sebastião Island (Ilhabela - SP) and to validate the occurrence of orographic effect, a set of 13 experimental rain gauges were installed throughout the Estrada de Castelhanos. The monthly totals from the 2004/2005 hydrological year were compared to other rainfall data recording posts, to different altitudes and to (predominant) southeastern currents. The results show topography as an agent interfering with the regional precipitation rhythm, clearly distinct in the island and in the spatial distribution of the local rain. The continental slope presents, in average, 20% less rain than the windward sea slope, which characterizes the rain shadow. In the sea slope, intensification and increase of the rainfall begins at 300m. The maximum monthly totals were observed at 600 m altitude (708.5mm, in march/2005).

ASSUNTO(S)

orographic effect slope chuva orográfica ilha de são sebastião precipitation sombra de chuva efeito orográfico rain shadow orographic rainfall precipitação são sebastião island

ACESSO AO ARTIGO

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