Abstract:
The method adopted for delimitation of watersheds with high susceptibility to debris flow and flash flood was based on morphometric parameters in appropriate scale analysis. The watershed analysis was divided into two steps, both in Geographic Information System. In the first step performs an analysis of the relief patterns and the susceptibility mass movements’ maps. If the premises are accepted (mountain relief and high susceptibility) follows for the second stage. The second step is the definition and analysis of watersheds which is generated from the digital terrain model with getting the area and amplitude of these basins. The basins with amplitude less than 500 m are classified as flash flood and the amplitude with greater than 500 m performs the calculation of Melton Index. If the Melton index is greater than 0.3 these basins are classified as debris flow otherwise as flash flood. The method was applied to the municipalities in the south and southeast of Brazil where this model was adequate considering the map scale. The use of Geographic Information System proved to be a useful tool as it allows a wide range of analyzes making the agile procedure.
Reference:
CORSI, Alessandra Cristina; GRAMANI, Marcelo Fischer; OGURA, Agostinho Tadashi. Método para delimitação de bacias de drenagem suscetíveis a corrida de massa e enxurrada em regiões serranas. In: SIMPÓSIO BRASILEIRO DE CARTOGRAFIA GEOTÉCNICA E GEOAMBIENTAL, 9., 2015, Cuiabá. Trabalho apesentado…. São Paulo: ABGE, 2015. CD, 5p.
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https://escriba.ipt.br/pdf_restrito/172963.pdf
The method adopted for delimitation of watersheds with high susceptibility to debris flow and flash flood was based on morphometric parameters in appropriate scale analysis. The watershed analysis was divided into two steps, both in Geographic Information System. In the first step performs an analysis of the relief patterns and the susceptibility mass movements’ maps. If the premises are accepted (mountain relief and high susceptibility) follows for the second stage. The second step is the definition and analysis of watersheds which is generated from the digital terrain model with getting the area and amplitude of these basins. The basins with amplitude less than 500 m are classified as flash flood and the amplitude with greater than 500 m performs the calculation of Melton Index. If the Melton index is greater than 0.3 these basins are classified as debris flow otherwise as flash flood. The method was applied to the municipalities in the south and southeast of Brazil where this model was adequate considering the map scale. The use of Geographic Information System proved to be a useful tool as it allows a wide range of analyzes making the agile procedure.
Reference:
CORSI, Alessandra Cristina; GRAMANI, Marcelo Fischer; OGURA, Agostinho Tadashi. Método para delimitação de bacias de drenagem suscetíveis a corrida de massa e enxurrada em regiões serranas. In: SIMPÓSIO BRASILEIRO DE CARTOGRAFIA GEOTÉCNICA E GEOAMBIENTAL, 9., 2015, Cuiabá. Trabalho apesentado…. São Paulo: ABGE, 2015. CD, 5p.
Document with restricted access. Login to BiblioInfo, Biblioteca-DAIT/IPT to access PDF text:
https://escriba.ipt.br/pdf_restrito/172963.pdf
