IDENTIFICAÇÃO DE ÁREAS HIDROLOGICAMENTE SENSÍVEIS POR MEIO DE MODELAGEM HIDROLÓGICA E DA DISTRIBUIÇÃO ESPACIAL DE SOLOS E VEGETAÇÃO EM AMBIENTES HIDROMÓRFICOS Identifying hydrologically sensitive areas through hydrological modelling and the spatial distribution of soil and vegetation in hydromorphic environments

This paper presents a methodology based on hydrogeomorphological process dynamics and the related soil-vegetation to establish the hydrological sensitivity limit of the landscape and identify hydrologically sensitive areas in the Pequeno River watershed, PR (104 km²). Hydrologically sensitive areas (HSA) are defined as areas in a watershed that have a greater probability of reaching soil saturation and generating runoff via variable source areas. HSAs are spatially delimited by the definition of a hydrological sensitivity limit. TOPMODEL was used to simulate the rainfall-runoff process on a daily scale from 08/01/1993 to 11/30/2010. The simulation indicates that variable source areas are extremely dynamic and sensitive to