Regionalisation of low flow frequency curves for the Peninsular Malaysia

Mamun, Abdullah Al; Hashim, Alias; Daoud, Jamal Ibrahim

doi:10.1016/j.jhydrol.2009.11.039

Cited by 26 publications

(14 citation statements)

References 14 publications

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“…Quando o interesse é realizar análises em escala regional heterogênea no que diz respeito aos processos hidrológicos, é plausível dividir a região de interesse em sub-regiões a fim de agrupar as bacias que apresentam comportamento hidrológico homogêneo, como tem sido apontado por diversos estudiosos (Mamun et al, 2010;Booker & Snelder, 2012;Tongal et al, 2013).…”

Section: Palavrasunclassified

Índices de sazonalidade para regionalização hidrológica de vazões de estiagem no Rio Grande do Sul

Beskow¹,

Mello²,

Faria³

et al. 2014

Rev. bras. eng. agríc. ambient.

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Informações sobre vazões de estiagem são cruciais no contexto da gestão de recursos hídricos; todavia, a rede de monitoramento fluviométrico atualmente existente no Brasil não supre as necessidades dos técnicos, caso em que a análise regional pode ser empregada para estimar vazões de estiagem em locais sem monitoramento ou com um curto período de monitoramento. O objetivo deste trabalho foi verificar o potencial de três métodos de sazonalidade aplicados à avaliação do regime temporal e espacial de vazões de estiagem no Rio Grande do Sul, de modo que possam ser usados como subsídio técnico para a regionalização em regiões hidrologicamente homogêneas. Aplicando os métodos Seasonality Ratio (SR), Seasonality Index (SI) e Seasonality Histogram (SH) com base nas séries históricas de 108 estações fluviométricas, foi possível constatar que existe uma forte sazonalidade de vazões de estiagem no estado. Entre as três medidas de sazonalidade, SI e SH foram mais apropriadas em função das características hidrológicas específicas do estado; portanto, elas podem ser consideradas metodologias relevantes para delinear regiões hidrologicamente homogêneas para a regionalização hidrológica de vazões de estiagem.

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Section: Palavrasunclassified

Índices de sazonalidade para regionalização hidrológica de vazões de estiagem no Rio Grande do Sul

Beskow¹,

Mello²,

Faria³

et al. 2014

Rev. bras. eng. agríc. ambient.

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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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“…Clarke (1993) also observed that the distribution that presented the highest adhesion to minimum flows was the Weibull distribution. Mamun et al (2010) tested several distributions and found that, in general, the distribution of extreme values (GEV) showed good adjustment for most of the minimum flows. Euclydes (1992) and Silva et al (2006) found better representation with the three-parameter Lognormal probability model.…”

Section: /14mentioning

confidence: 99%

Frequency analysis of minimum flows

Granemann

Mine

Kaviski

2018

RBRH

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The study of minimum flows is increasingly important due to the relationship with ecosystem sustainability, the economy and its role as a sentinel of climate change. The aim of this paper is to contribute to the theoretical treatment of minimum extremes and, specifically, minimum flows. The method has two approaches: i) conventional; ii) asymptotic. In conventional analysis, the Weibull (W2) and Lognormal distributions of two parameters (LN2) were adjusted to the series of annual minimum flows and minimum averages of 7-day flows. In the asymptotic analysis approach two parent distributions, the distributions of all average daily flows, with power behavior for minimum flows, are investigated: i) Gamma; ii) LN2. The theory studied in this paper is applied to 11 gauged stations in the Iguaçu river basin with 48-year data series. It was concluded that the LN2 distribution presents the best fit according to the χ 2 test. It was found that the Gamma distribution, with respect to the minimums, tends to a power function, and consequently the W2 distribution. The parameters k, b and μ X , of the normalized annual minimum flow series are well-fitted to the LN2 distribution. According to both approaches, LN2 can be recommended for studies of minimum flows in the Iguaçu river basin.

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Regionalisation of low flow frequency curves for the Peninsular Malaysia

Cited by 26 publications

References 14 publications

Índices de sazonalidade para regionalização hidrológica de vazões de estiagem no Rio Grande do Sul

Índices de sazonalidade para regionalização hidrológica de vazões de estiagem no Rio Grande do Sul

Extrapolation of regionalization equations for long-term average flow

Frequency analysis of minimum flows

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