Comportamento da infiltração de água no solo em parque urbano

Abstract

The objective of this work is to evaluate the infiltration capacity and to determine the hydrodynamic parameters of three surfaces (community use, children's recreation and gardens) in an urban park in Recife/PE. The Beerkan methodology was used to determine the parameters of the water retention curve and the hydraulic conductivity curve from 24 infiltration tests. Besides that, the surfaces’ water balance subjected to 365 days of rainfall was simulated with the aid of the Hydrus 1D model. The garden areas presented the higher values for maximum infiltration rates (553.58 mm.h-1), followed by children's recreation areas (116.70 mm.h-1) and and community use area (18.75 mm.h-1). The areas’ predominant textures had no direct correlation with the saturated hydraulic conductivity (Ks), presenting values between 25.38 and 306.65 mm.h -1 for sandy loam soils (gardens); 7.67 and 542.2 mm.h-1 for sandy clay loam (gardens and community use); and 4.07 and 256.86 mm.h -1 for loamy sand (recreation). The water retention capacity was lower in the gardens, with opposite behavior in the community use areas. The Hydrus’ simulations resulted in higher values of runoff and evaporation in the gardens. They showed that there is no difference in the values of cumulative infiltration in the three areas.