Modelagem da qualidade das águas utilizando o modelo QUAL2Kw : estudo de caso na bacia hidrográfica Rio Vermelho, MT
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Data
2021-09-03
Autores
Hergenräder, Jéssica Angélica
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Universidade Federal de Mato Grosso
Resumo
In-stream water quality models can be useful in the decision-making process for watershed
management, as they allow representing real situations and simulating responses to various
strategies, making it possible to predict, for example, the capacity of the river to receive
effluents. The main objective of this paper is to evaluate the self-purification capacity of the
Vermelho River through the ecological approach of the QUAL2kw mathematical model,
considering the contributions of the tributaries and the water and sewage treatment station of
Rondonópolis, always considering the limits established by the CONAMA Resolution 357/05
for class rivers 2. For this, the behavior of the Dissolved Oxygen and Biochemical Oxygen
Demand variables was evaluated by simulating of three scenarios: (i) maximum selfpurification capacity of the Vermelho River, through a gradual increase in the effluent discharge
flow; (ii) untreated polluting load flow from the largest lift station in the sanitary sewage system
in the city of Rondonópolis; (iii) increased water captation and as consequence of the release
of effluents based on the municipality's population growth until 2036. The historical data on
water quality made available by the ANA and Sema monitoring sites, as well as the monitoring
campaign, made it possible to have the data needed to implement the model and implement its
calibration and validation. The results obtained allowed us to conclude that the QUAL2Kw
model presented as an adequate tool for the simulation of the different scenarios proposed in
this paper for the stretch of the Vermelho River analyzed. Scenario 2, the most critical, shows
the great impact on water quality at the launching point, which continues over several
kilometers, reaching the indigenous village Tereza Cristina, which is located after the end of
the studied stretch, which raises great concern, as the indigenous population is extremely
dependent on water from the river that passes through their village. In general, it can be said
that the results obtained in this paper represent a baseline in terms of water quality modeling
for the Vermelho River, since there is no previous modeling experience in this region. Finally,
the QUAL2kw water quality model implemented in the Vermelho River can be further adjusted
based on others monitoring campaigns to consolidate itself as a reliable and effective tool for management and environmental agencies.
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HERGENRÄDER, Jéssica Angélica. Modelagem da qualidade das águas utilizando o modelo QUAL2Kw: estudo de caso na bacia hidrográfica Rio Vermelho, MT. 2021. 73 f. Dissertação (Mestrado em Gestão e Tecnologia Ambiental) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2021.