Hydrological simulation uncertainties in small basins through the SWAT model

Venzon, Pedro Thiago; Pinheiro, Adílson; Kaufmann, Vander

doi:10.1590/2318-0331.231820180014

Cited by 4 publications

(2 citation statements)

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“…For the quantitative (flow) model calibration, 11 fluviometric stations in the basin were used (Figure 1). As the data series available in ANA (Agência Nacional de Águas, 2018) was not included for the period, data available in Venzon et al (2018) were used. The temperature, solar radiation, wind speed and relative air humidity were extracted from Instituto Nacional De Meteorologia (2018) from two monitoring stations, Indaial and Ituporanga (Santa Catarina state).…”

Section: Hydrological Modelmentioning

confidence: 99%

Scenarios of water quality management in watershed with distributed spatio-temporal simulation

Knaesel

Pinheiro

Venzon

et al. 2020

RBRH

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The implementation of National Water Resources Policy instruments depends on detailed information in space and time, on a large scale, within the river basin. This research aims to evaluate scenarios to support water quality management in watershed by modelling with spatio-temporal discretization distributed in a small spatial dimension. The SWAT hydrological model was applied in the Itajai river basin. This hydrographic basin with 15,000 km2 was discretized in 2,103 hydrological response units (HRUs). The model input data for each HRU were fed in, from the quantitative and qualitative aspects. The time series of water quality was obtained in non-systematic monitoring from different sources, such as water supply companies and potential polluting companies, among others. The model calibration and validation were performed, presenting adequate results for both the quantitative and qualitative processes. The scenarios corresponding to current and evolutionary situations of pollutant contribution for four water quality parameters (biochemical oxygen demand, total phosphorus, total nitrogen and thermotolerant coliforms) were analysed. The results are expressed as the mean, median, non-exponential frequency of 80% and reference flow, discussing the statistical index that best represents the pollutant concentrations in the bodies of water. The simulations show that the measures proposed for the water quality management of the basin promote a significant reduction in pollutant concentrations in comparison to the critical scenario. According to the results, it can be affirmed that the discretization of the basin in small contribution areas generates greater results precision of the model. The daily and distributed data in the basin provide localized information, according to the basin ortho coding, supporting the decision in order to support the management of water resources, contributing to the implementation process of the framework of surface water courses in the basin, as well as serving as a generic model for other purposes.

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Section: Hydrological Modelmentioning

confidence: 99%

Scenarios of water quality management in watershed with distributed spatio-temporal simulation

Knaesel

Pinheiro

Venzon

et al. 2020

RBRH

Self Cite

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“…Logo, os estudos de simulação hidrológica possibilitam, entre outras aplicações, a previsibilidade do regime fluvial, assim como as taxas de escoamento superficial em pequenas e grandes bacias hidrográficas, sob diferentes cenários climáticos e de cobertura do solo. Dessa forma, tais estudos constituem-se uma importante ferramenta para estratégias de gestão dos recursos hídricos (Venzon;Pinheiro e Kaufmann, 2018).…”

Section: Introductionunclassified

Aplicação do Modelo Hidrológico MGB-IPH para Simulação de Cenários de Uso do Solo na Bacia do Rio Sapucaí (MG)

Siqueira

Pons

Silva

et al. 2022

Rev. Bras. Geog. Fis.

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O Novo Código Florestal (NCF), Lei Federal 12.651/2012, alterou as definições para Áreas de Proteção Permanente (APP) localizadas nos topos de morro, o que reduziu drasticamente a área legalmente amparada para tal categoria de proteção. Nesse sentido, buscou-se compreender como o uso e a cobertura do solo podem alterar o regime hidrológico, utilizando-se de cenários e simulações de um modelo conceitual distribuído. Para tanto, mapearam-se as APP de topo de morro de acordo com a definição revogada e lei vigente, utilizando-se a metodologia do Modelo Digital de Elevação (MDE) invertido. Tal mapeamento embasou a elaboração de quatro cenários de Uso e Cobertura do Solo (UCS) na bacia, com diferentes percentuais de cobertura florestal. Para a simulação hidrológica utilizou-se o Modelo de Grandes Bacias do Instituto de Pesquisas Hidráulicas (MGB-IPH), o qual foi ajustado para as condições atuais de UCS e, posteriormente, simulou-se o comportamento hidrológico mediante os diferentes cenários. De acordo com o mapeamento realizado, a redução das APP de topo de morro para a bacia do rio Sapucaí é superior a 99% com a aplicação do código vigente. Não se verificou diferenças no comportamento hidrológico da bacia considerando as condições de UCS atual e os três cenários baseados na cobertura das APP. No terceiro e quarto cenário verificou-se o aumento das vazões médias que coincide com o aumento da cobertura florestal. Destaca-se que esse aumento resultou da maior quantidade de água no solo, uma vez que o escoamento superficial foi reduzido com o aumento da cobertura florestal na sub-bacia.Palavras-chave: Simulação hidrológica, legislação ambiental, regime hidrológico Application of the MGB-IPH Hydrological Model for Simulating Land Use Scenarios in the Sapucaí River Basin (MG)A B S T R A C TThe New Forest Code (NFC), Federal Law 12.651/ 2012, changed the definitions for Permanent Protection Areas (PPA) located on the hilltops. The resolutions drastically reduced the area legally protected by this category of protection. In this sense, we sought to understand how the land use and land cover (LULC) can alter the hydrological regime, using scenarios and simulations of a distributed conceptual model. For that, the top of hill PPAs were mapped according to the revoked definition and current law, using the inverted Digital Elevation Model (DEM) methodology. Such mapping supported the development of four hypothetical LULC scenarios in the basin, with different percentages of forest cover. For the hydrological simulation, the Large Basin Model of the Institute of Hydraulic Research (MGB-IPH) was used and was adjusted to the current conditions of LULC and later, the hydrological behavior was simulated under the different scenarios. According to the mapping carried out, the reduction of PPAs at the top of the hill for the Sapucaí River basin is greater than 99% with the application of the current code. There were no significant differences in the hydrological behavior of the basin considering the current LULC conditions and the three scenarios based on PPA coverage. In the third and fourth scenarios, there was an increase in average flows that coincides with the increase in forest cover. It is noteworthy that this increase is the greater amount of water in the soil, once the runoff was reduced with the increase of the forest cover in the sub-basin.Keywords: Hydrological simulation, environmental legislation, hydrological regime

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