ÁREAS DA SEÇÃO TRANSVERSAL INUNDÁVEL E DECLIVIDADE EM RELAÇÃO AO CURSO D’ÁGUA MAIS PRÓXIMO COMO EXTENSÕES DO MODELO HAND: MAPEAMENTO DE SUSCEPTIBILIDADE À INUNDAÇÃO NA REGIÃO DE LUCAS DO RIO VERDE, MATO GROSSO, BRASIL/ FLOODABLE CROSS-SECTIONAL AREA...

Resumo

The HAND (Height Above the Nearest Drainage) model has been applied as a robust indicator for mapping flood susceptibility and the gradients of hydrological-edaphic-ecological processes. This paper extends the HAND model by combining the vertical and horizontal distances in relation to the nearest drainage to generate the indicators of floodable cross-sectional area and slope to the nearest drainage. The HAND, cross-sectional area, conventional slope, and slope to the nearest drainage indicators are combined for distinct analyses of flood susceptibility mapping in the Lucas do Rio Verde region, Mato Grosso State, Brazil. The indicators of cross-sectional area and slope to the nearest drainage were spatially consistent with the expected hydrogeomorphological characteristics. The maps based on floodable cross-sectional area, when compared to those based on the HAND model, were more restrictive in areas further from watercourses, especially when combined with slope classes.