Avaliação da aplicação do modelo hidrológico swat à Bacia do Ribeirão Concórdia-Lontras, SC

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

19/10/2009

RESUMO

Hydrological models have been widely used in assessing impacts of land use changes on the quantitative and qualitative aspects of water in a watershed. The hydrological model SWAT (Soil and Water Assessment Tool), developed by the United States Department of Agriculture (USDA), is a physically based model and distributed parameters, aided by a graphical user interface of GIS software. In this study, it was evaluated the application of SWAT model to the Concórdia Creek Experimental Watershed, with an area of 30.74 km2 , located in Lontras, SC, Brazil, part of the Itajaí River Basin, the largest basin of the Atlantic slope of the state of Santa Catarina. The evaluation was made through comparison between measured and simulated data for flow, sediment and nutrients concentrations (nitrite, nitrate, total phosphorus and orthophosphate) in the channel, after sensitivity analysis and manual calibration of parameters, for the period between years 2006 and 2009. The primary index used in the evaluation of model performance was the Nash-Sutcliffe efficiency coefficient (NSE). The results showed that it was possible to obtain a good fit for the simulations in the monthly time scale for flow (NSE equal to 0.88) and sediment (NSE equal to 0.84). However, the daily simulations revealed that limits on the input data and parameterization profoundly affected the efficiency of the model. NSE values for the daily time scale decreased in the following of the calibration (0.32 for flow, -0.01 for sediment, 0.20 for nitrite, -0.35 for nitrate, -0.04 for orthophosphate and -4.76 for total phosphorus). Despite this, the average values for simulated flow and sediment were close to the average values of measured data, and for the nutrients, the simulated values were within the range of coverage of the measured values

ASSUNTO(S)

nutrients sediment swat hydrological model hidrologia modelo hidrológico nutrientes sedimentos simulação distribuída swat solos - conservação, ribeirão concórdia (lontras, sc); bacias hidrográficas - aspectos ambientais, lontras (sc); sedimentos (geologia) distributed simulation

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