Erosion has been recognized as the main cause of soil degradation and is accelerated by human intervention in watersheds, causing losses to the agricultural sector and damaging the environment. To estimate the impacts caused by land use or climate changes on hydrosedimentological processes, physically-based distributed models have been shown to be quite effective. In this study, the SWAT model was calibrated and validated for two subwatersheds of the Japaratuba Mirim river watershed, one located upstream of the Fazenda Pão de […]

Mathematical models have great potential to support land use planning, with the goal of improving water and land quality. Before using a model, however, the model must demonstrate that it can correctly simulate the hydrological and erosive processes of a given site. The SWAT model (Soil and Water Assessment Tool) was developed in the United States to evaluate the effects of conservation agriculture on hydrological processes and water quality at the watershed scale. This model was initially proposed for use […]

Hydrological models developed to predict the impacts of non-point source pollution and land use and occupation on water quality have been extremely useful in the study of agricultural systems. For this purpose, the objective of this study was to evaluate the sensitivity of the model SWAT 2005 (Soil and Water Assessment Tool) to simulate the flow rate and total phosphorous flow mass. The research was conducted in two contiguous watersheds of the Conrado and Pinheiro rivers, affluents to the Pato […]

Based on a detailed analysis of the process of water infiltration into the soil, an alternative is proposed to adjust the input parameters of the Green-Ampt-Mein-Larson (GAML) model to optimize infiltration estimates of some Brazilian soils. The adjustments consisted of the replacement of the parameters saturated hydraulic conductivity (K0) by stable infiltration rate (Tie) and soil moisture saturation (qs) by water content in the transmission zone (qw). Moreover, an equation was established to estimate the matric potencial at the wetting […]