Characterization of water availability in a hydrographic basin

Arai, Fabiane Kazue; Pereira, Sílvio Bueno; Gonçalves, Geula Graciela Gomes

doi:10.1590/s0100-69162012000300018

Cited by 23 publications

(20 citation statements)

References 4 publications

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“…Generally, there are no measurements of streamflow in parts of the rivers in which the estimate of it is required (ARAI et al, 2012). To fix this problem, streamflow regionalization, which is a technique used to supply hydrological information about places with little or no data available, has been frequently employed (MASIH et al, 2010;MAMUN et al, 2010;SAMUEL et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Extrapolation of regionalization equations for long-term average flow

et al. 2016

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Knowledge about long-term average flow is essential for planning and managing water resources because it represents the potential water availability. One technique used to determine streamflow is regionalization, but because most gauge stations normally are associated with large drainage areas, the extrapolation of regionalization equations does not accurately represent the water availability; therefore, this method is not recommended. The main objective of the present paper is to propose a new method of estimating water availability that minimizes the risks of extrapolating regionalization equations for long-term average flow. The method is based on the use of a threshold value of the runoff coefficient to obtain the long-term average flow at the positions of the basin where the runoff coefficient estimated by the regionalization equation exceeds the threshold value. It was found that values of the runoff coefficient estimated average flows greater than twice those of the threshold values. The use of this method allows a reliable estimation for long-term average flows in regions of extrapolation without compromising the security of the available water supply.KEY WORDS: water availability, planning and management of water resources, water safety.

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Section: Introductionmentioning

confidence: 99%

Extrapolation of regionalization equations for long-term average flow

et al. 2016

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“…However, the increasing use of water resources contributed to the loss of biodiversity and ecological integrity of such environments (ARAI et al, 2012;VOROSMARTY et al, 2010). Human activities associated with the use of water led to a number of morphological changes in the watercourses (TUHTAN et al, 2012), reducing their heterogeneity and, consequently, the availability of adequate physical habitats for aquatic species (HOLMQUIST & WADDLE, 2013).…”

Section: Introductionmentioning

confidence: 99%

One- And Two-Dimensional Ecohydraulic Modeling of Formoso River (Mg)

et al. 2016

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ABSTRACT:The objective of this study was to compare ecohydrological simulations from a onedimensional model (PHABSIM -Physical Habitat Simulation System) and a two-dimensional model (River2D) in order to indicate a reliable tool that could be used to determine public policies for the sustainable management of the water resources of the Formoso River basin (MG). The results from the calibration of hydraulic variables, namely, water depth and velocity, as well as habitat predictions for three fish species of the river were compared. The results showed that River2D was best suited to simulate ecohydrological features for the studied river stretch. Although PHABSIM presented a better fit of the hydraulic variables at the calibration process, the use of only three monitoring cross sections to compose the biotic model database compromised its habitat modeling. PHABSIM model was not able to accurately assess the actual characteristics of the physical habitat in the segments of the river located between the monitoring cross sections.

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“…Knowledge about these flows is essential for effective shared planning and management of water resources (LI et al, 2010;MASIH et al, 2010;NOVAES et al, 2009). Society requires reliable hydrological forecasts; however, in many cases, observed streamflow data is not available or is insufficient in terms of quality and quantity (ARAI et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Low-flow estimates in regions of extrapolation of the regionalization equations: a new concept

Pruski¹,

Rodríguez²,

Nunes³

et al. 2015

Eng. Agríc.

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Knowledge of natural water availability, which is characterized by low flows, is essential for planning and management of water resources. One of the most widely used hydrological techniques to determine streamflow is regionalization, but the extrapolation of regionalization equations beyond the limits of sample data is not recommended. This paper proposes a new method for reducing overestimation errors associated with the extrapolation of regionalization equations for low flows. The method is based on the use of a threshold value for the maximum specific low flow discharge estimated at the gauging sites that are used in the regionalization. When a specific low flow, which has been estimated using the regionalization equation, exceeds the threshold value, the low flow can be obtained by multiplying the drainage area by the threshold value. This restriction imposes a physical limit to the low flow, which reduces the error of overestimating flows in regions of extrapolation. A case study was done in the Urucuia river basin, in Brazil, and the results showed the regionalization equation to perform positively in reducing the risk of extrapolation.KEYWORDS: water availability, planning and management of water resources, water safety ESTIMATIVA DE VAZÕES MÍNIMAS EM REGIÕES DE EXTRAPOLAÇÃO DAS EQUAÇÕES DE REGIONALIZAÇÃO: UM NOVO CONCEITORESUMO: O conhecimento da disponibilidade hídrica natural, caracterizada pelas vazões mínimas, é essencial para o planejamento e a gestão dos recursos hídricos. Uma das técnicas hidrológicas mais utilizadas para estimar a vazão é a regionalização, mas a extrapolação das equações de regionalização para além dos limites dos dados usados para estimar os parâmetros do modelo de regressão não é recomendada. Este trabalho propõe um novo método para minimizar o risco associado à extrapolação das equações de regionalização de vazões mínimas. O método baseia-se na utilização de um valor de limiar, que é a máxima vazão mínima específica estimada nas estações fluviométricas utilizadas no estudo de regionalização. Quando a vazão mínima específica estimada a partir da equação de regionalização excede o valor limiar, a vazão mínima é obtida multiplicando-se a área de drenagem pelo valor limiar. Esta restrição impõe um limite físico para as vazões mínimas, o que reduz o risco de superestimar as vazões nas regiões de extrapolação. Um estudo de caso foi realizado para a bacia Urucuia, no Brasil, e os resultados obtidos mostraram um bom desempenho da equação de regionalização, o que reduz o risco de extrapolação. PALAVRAS-CHAVE:disponibilidade hídrica, planejamento e gestão de recursos hídricos, segurança hídrica.

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Characterization of water availability in a hydrographic basin

Cited by 23 publications

References 4 publications

Extrapolation of regionalization equations for long-term average flow

Extrapolation of regionalization equations for long-term average flow

One- And Two-Dimensional Ecohydraulic Modeling of Formoso River (Mg)

Low-flow estimates in regions of extrapolation of the regionalization equations: a new concept

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