EMERGING CONCEPTS IN HYDROLOGY FOR TROPICAL PACIFIC REGIMES
2010; Copernicus Publications; Linguagem: Inglês
10.1142/9789812836144_0005
ISSN1680-7359
Autores Tópico(s)Flood Risk Assessment and Management
ResumoWork over the last decade in Fiji, New Caledonia, Samoa and Solomon Islandshas begun to reveal some emerging concepts in Pacific tropical island hydrology.Tropical cyclones (TCs) are a major cause of floods and several features ofcyclone behavior, such as slow and unusually sinuous tracks, increase both theamount of precipitation received and the consequent size of the flood produced.Strong orographic influences of rugged volcanic terrain mean that “cyclonesides” of islands may be identified in relation to the common directions ofTC approach, but these cyclone sides are not the same as the windwardsides of islands under normal climatic conditions. Large and/or numerouslandslides during storms may temporarily dam headwater channels, but thensubsequently fail, giving unpredictable storm hydrographs with multiple peaks,where the timing of the floods is not clearly associated with the temporalpatterns in rainfall.
Referência(s)