Avaliação de métodos de baixo custo para medição de vazão em córregos

Maldonado, Luiz Henrique; Wendland, Edson; Porto, Rodrigo de Melo

doi:10.4136/ambi-agua.1293

Cited by 4 publications

(3 citation statements)

References 6 publications

(4 reference statements)

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“…To calculate the average flow of the channels in the cross sections, the instantaneous speed (m/s) was measured using a flow probe (Flowatch ® ) and the depth (m) measured with a level ruler. The measurements were made according to the width of the sampled section, ranging from 3–7 measurement points in the transversal direction per sampling point [ 33 , 34 ]. To obtain the average speed in the section (m 3 /s), the number of instantaneous speed measurements varied according to the depths found.…”

Section: Methodsmentioning

confidence: 99%

Changes in the hydro-sedimentary balance: Impacts of the use of a borrow pit in a low-order stream

et al. 2021

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Construction of dams for hydroelectric power requires significant quantities of soil and rock, which are often extracted in borrow pits from adjacent regions. Although the effects of dams on stream processes has received significant attention, the effects of borrow pits has not. The main objective of this study was to analyze the geomorphological and sedimentological aspects of two second-order streams, one of which was directly affected by the borrow pit located upstream of its source (Pedra Branca stream). Flow rates were measured and cross-sections of 600m stretches in both streams were monitored over a hydrological year. At the same time, sediments from the bed of the channels and soils on their banks had their physical and chemical characteristics evaluated. Streams sediments differed in their chemical and organic matter composition. The mean particle size of the sediment particles was different between the reference and degraded streams. The water flow was very similar to both streams, only varying along the seasonal seasons. However, the fluvial channels presented great geomorphological differentiation, mainly downstream, due to the location of the Pedra Branca stream and its proximity to the borrow pit. Despite the great importance for the production of clean electric energy, the construction of hydroelectric plants promotes persistent impacts that affect structural and functional aspects of the adjacent aquatic habitats. Borrow pits used for the construction of projects become large sources of sediment for aquatic environments, affecting the drainage network of the hydrographic basin and the balance of river erosion, transport and deposition processes. The results show the need to review the intervention protocols in borrow pits and the environmental legislation that regulates their rehabilitation.

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Section: Methodsmentioning

confidence: 99%

Changes in the hydro-sedimentary balance: Impacts of the use of a borrow pit in a low-order stream

et al. 2021

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“…As medições de vazões foram realizadas através do método convencional, com a utilização do molinete hidrométrico, para a determinação da área e da velocidade média do fluxo que passa pela seção transversal do ponto monitorado (MALDONADO; WENDLAND; PORTO, 2015). De acordo com a medição a vau (Medição realizada por um observador que atravessa o curso de água a pé medindo profundidades e velocidades, indicados para rios de pequena largura e pouca profundidade (CARVALHO, 2008)), dividiu-se em três seções (0,5m, 1m e 1,5m), ao longo do comprimento total (2,20m) da seção transversal do tributário do rio Apeú (localizado na sub-bacia 5), em nível d'água de 0,14, 0,14 e 0,11m (60% de profundidade), durante 30 dias (de novembro a dezembro), conforme resolução da ISO 748 (ISO, 2007).…”

Section: Curva Hipsométrica Da Bacia Hidrográfica Do Rio Taboãounclassified

O Modelo SWAT como Ferramenta para a Gestão de Recursos Hídricos: Um exemplo aplicado no rio Apeú, Castanhal/PA

Santos

Sousa

Nunes³

et al. 2018

REGA

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RESUMOO gerenciamento dos recursos hídricos tem impulsionado pesquisas, que buscam alternativas de conhecimento dos processos ocorridos em bacias hidrográficas. Diante disso, este estudo teve como objetivo aplicar o modelo SWAT (Soil & Water Assessment Tool) como ferramenta complementar para o gerenciamento de recursos hídricos. O modelo foi utilizado na bacia do Rio Apeú, de 2009 a 2017, para a obtenção de informações sobre a dinâmica do ciclo hidrológico, a partir das variáveis climáticas, tipo e uso do solo, estas informações podem auxiliar no planejamento da gestão dos recursos hídricos. Durante a calibração do modelo, foi obtida uma boa eficiência (Nash-Sulticliffe) com um valor de 0,89, que foi alcançada pela correlação (R 2 = 0,99) entre os valores simulados e observados e pelos baixos valores de erro durante a simulação da vazão. Estes resultados mostram que o modelo pode auxiliar na geração de informações em áreas que não possuem monitoramento e assim obter um melhor planejamento dos recursos hídricos para as bacias.

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“…Therefore, it is essential to develop research which will provide such information, since there is great concern for the efficient use of water in irrigated agriculture. It becomes increasingly more important to find the real value of this basic variable of hydrology, which is the flow rate (Maldonado et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Use of indirect methodologies for determining the flow rate in water pumping systems

Ferreira

Robaina

Peiter

et al. 2021

Agraria

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Water flow rate measurements are important for monitoring the irrigation practice. It is essential to find the real value of this variable using alternative low-cost methods which are easy to use or readily available. This study aimed to perform a comparative analysis among different methodologies for determining the flow rate in water pumping systems. Seven methodologies were analyzed, with 13 tests each. Three tests were done for adjustment and ten to test the equations. The correlation between the observed value and the values obtained by the methodologies was performed for the adjustment. The equations were subsequently used to obtain the estimated flow rate for comparison with the observed values. The comparative analysis was performed through the following statistical indicators: Precision Index, Agreement Index, Performance index, Root mean square deviation and Nash-Sutcliffe efficiency. The methodology which showed the best adjustment in the flow estimation was the U-tube vacuometer. The pressure showed the best general performance among the tested parameters with the Tensiometer, Bourdon vacuum gauge and U-tube vacuum gauge instruments.

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Avaliação de métodos de baixo custo para medição de vazão em córregos

Cited by 4 publications

References 6 publications

Changes in the hydro-sedimentary balance: Impacts of the use of a borrow pit in a low-order stream

Changes in the hydro-sedimentary balance: Impacts of the use of a borrow pit in a low-order stream

O Modelo SWAT como Ferramenta para a Gestão de Recursos Hídricos: Um exemplo aplicado no rio Apeú, Castanhal/PA

Use of indirect methodologies for determining the flow rate in water pumping systems

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