Applicability of the swat model for hydrologic simulation in Paraopeba River basin, MG

Abstract

ABSTRACT:The SWAT model (Soil and Water Assessment Tool) was applied for simulating the hydrologic pattern of Paraopeba river basin, in Minas Gerais state, under different land use and occupation scenarios, looking to support basin management actions. The model parameters were calibrated and validated, with respect to the data observed from 1983 to 2005. The basin was assessed at the 'Porto do Mesquita' gauging station and change in land use and occupation was based on the annual growth scenarios proposed in the partial report of Paraopeba basin's master plan. The model was found to be highly sensitive to basefl ow, its main calibration variable. Statistical analyses produced a Nash-Sutcliffe coeffi cient above 0.75, which is considered good and acceptable. The SWAT model provided satisfactory results in simulating hydrologic pattern under different scenarios of land use change, demonstrating that it can be applied for forecasting discharge in the aforesaid basin. The current land use scenario provided a peak discharge simulation of 1250 m³ s -1 , while in years 2019 and 2029 peak discharge simulations were 1190 m³ s -1 and 1230 m³ s -1 respectively. The 2019 scenario provided the best results with respect to basefl ow increase and peak discharge reduction.

Simulação hidrológica em uma bacia hidrográfica representativa dos Latossolos na região Alto Rio Grande, MG

“…A análise de sensibilidade é um instrumento para previsão dos parâmetros do modelo sobre os resultados de sua saída, o que possibilita a racionalização da etapa de calibração, tal como, também, a fixação dos parâmetros para os quais o modelo é pouco sensível (Durães et al, 2011). Em referência à análise de sensibilidade, o modelo SWAT utiliza uma combinação do "Latin Hypercube"com o "One-Factor-At-a-Time" (Griensven, 2005).…”

“…O SWAT tem sido adaptado, desde o seu surgimento, para algumas áreas específicas e foi integrado ao SIG possibilitando a entrada do banco de dados, a elaboração e edição de cenários ambientais e sua representação em forma de gráficos e mapas, controle e simulações, além de extrair e organizar as saídas do modelo (Marchioro, 2008). Por meio de uma análise na literatura existente foi possível constatar algumas aplicações do SWAT em bacias hidrográficas brasileiras, como os de Pinto (2011), Silva et al (2011), Durães et al (2011) e Baltokoski et al (2010 dentre outros.…”

Impacts of deforestation on water balance components of a watershed on the Brazilian East Coast

“…The Soil and Water Assessment Tool (SWAT) is a semiconceptual, semi-distributed and continuous-time model, and was developed to predict the effects of different soil uses, covers and managements on water and sediment production and water quality (Durães et al, 2011). The model stands out among other hydrological models with wide utility and great flexibility in simulation.…”

Sarsina violascens spatial and temporal distributions affected by native vegetation strips in eucalyptus plantations

“…Both studied areas have tropical climate, classified as Aw according to Köppen, with a dry season. Their native vegetation belongs to the Cerrado biome, and the evaluated areas were located on the soil type Latossolo Vermelho-Amarelo (Oxisol) (Durães et al, 2011).…”

“…They were installed at a 2-m height, considering the midpoint of the lamp length . The collection period included pre-and post-rain seasons in the studied regions (Durães et al, 2011). The traps were turned on between 18:00 and 19:00 p.m. and turned off between 07:00 and 08:00 a.m. (13-hour operation), since S. violascens adults have a nocturnal habit (Dall'Oglio et al, 2013).…”