Grouping basins for regional flood frequency analysis

Wiltshire, S. E.

doi:10.1080/02626668509490976

Cited by 55 publications

(30 citation statements)

References 2 publications

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“…Consequently, some researchers define homogeneity in terms of flood-related variables such as normalized annual flood and coefficient of variation, which leads to nongeographical regions (Wiltshire, 1985;Burn, 1989). The use of multivariate analysis techniques resulted in non-geographical regions for the state of Kentucky (Bhaskar & O'Connor, 1989) and the island of Newfoundland (Cavadias, 1990) that were very different from those obtained using residual analysis.…”

Section: Methodology Homogeneous Regionsmentioning

confidence: 99%

Homogeneous region delineation based on annual flood generation mechanisms

Gingras

Adamowski

1993

Hydrological Sciences Journal

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Flood distributions can have unimodal or multimodal densities due to different flood generation mechanisms such as snowmelt and rainfall in the annual flood series. When applying nonparametric frequency analysis to annual flood data from the province of New Brunswick in Canada, unimodal, bimodal and heavy-tailed distribution shapes were found. By grouping basins with similarly-shaped densities on a geographical basis, homogeneous regions were delineated. Regional equations derived for a homogeneous region gave lower integral square errors than those of province-wide equations. Délimitation de régions homogènes basée sur le mécanisme de la genèse de la crue annuelleRésumé Les distributions des crues peuvent avoir des densités unimodales ou multimodales par suite de différents mécanismes tels que la fonte des neiges et la pluie dans la série annuelle des crues. En applicant l'analyse de fréquence non-paramétrique aux crues de la province du Nouveau-Brunswick au Canada, des distributions unimodales, bimodales et avec grande queue ont été découvertes. En groupant des bassins avec des densités de même forme sur une base géographique, des régions homogènes ont été délimitées. Des équations régionales pour une région homogène ont donné des erreurs carrées intégrées plus petites que celles des équations pour la province entière.

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Section: Methodology Homogeneous Regionsmentioning

confidence: 99%

Homogeneous region delineation based on annual flood generation mechanisms

Gingras

Adamowski

1993

Hydrological Sciences Journal

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“…Sua utilização tem se difundido como alternativa para auxiliar na descrição de diferentes fases do ciclo hidrológico em diferentes regiões do mundo, principalmente em locais nos quais o monitoramento hidrometeorológico apresenta alguma deficiência. Os trabalhos de Wiltshire (1985), Seibert (1999), Funke (1999), Dinpashoha et al (2004), Timilsena e Piechota (2008), Santhi et al (2008) e González e Valdéz (2008) constituem exemplos de diferentes formas de aplicação da técnica de regionalização hidrológica.…”

Section: Introductionunclassified

Análise Regional De Vazão Mínima De Referência Na Região Centro-Sul Do Estado Do Espírito Santo

Reis¹,

Caiado²,

Barbosa³

et al. 2013

Revista CIATEC-UPF

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A regionalização hidrológica é uma técnica utilizada para transferir espacialmente informações, buscando explorar ao máximo os dados disponíveis numa determinada região. Este trabalho estabeleceu funções regionais aplicáveis à apropriação da vazão mínima com permanência de 90% (vazão mínima de referência para a condução do processo de outorga pelo uso da água) na porção Centro-Sul do estado do Espírito Santo, região que envolve as bacias hidrográficas dos rios Jucu, Benevente, Novo, Iconha e Itapemirim. Em razão da ampliação do parque industrial siderúrgico instalado, da implantação de plantas industriais e porto associados à exploração de petróleo e gás, a região estudada tem a perspectiva de receber consideráveis investimentos em infraestrutura e de experimentar substancial crescimento populacional. Esse crescimento, se estabelecido, demandará volumes cada vez maiores de água, pressionando os recursos hídricos superficiais da região. O presente trabalho identificou duas regiões hidrologicamente homogêneas na área de estudo e estabeleceu funções regionais que permitiram estimar valores da vazão mínima de referência com erros sistematicamente inferiores a 15%. Palavras-chave: Regionalização de vazões. Vazão mínima. Outorga. ABSTRACTThere were established regional equations for estimates of Q 90 , minimum flow to remain 90% of the time, for the south-central portion of the Espirito Santo state, Brazil. The Q90 is utilized as reference for water use permits analysis in Espírito Santo. Due to the perspective of steel, oil and gas industries expansion, it is expected substantial population and industries water demands growth in the region. There were employed Geographical Information System and multiple regression analysis by the Best Subsets approach. The independent variables considered were area, perimeter, drainage density, total length of watercourses and average altitude, slope and precipitation. The study identified two hydrologically homogeneous areas in the study region and adjusted functions that allow estimates of values for the Q 90 reference minimum flow presenting error magnitudes below 15%.

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“…Acreman & Sinclair (1984) and Wiltshire (1985) discuss methods of identifying homogeneous flood distribution regions while Hosking et al (1985) examine, by simulation methods, properties of Qj estimates obtained from synthetic nonhomogeneous regions using homogeneous-region estimating techniques.…”

Section: Discrimination Between Distributionsmentioning

confidence: 99%

Factors affecting choice of distribution for flood series

Cunnane

1985

Hydrological Sciences Journal

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Rival candidate distributions for modelling flood series may give markedly different magnitudereturn period (Q-T) relationships, particularly at high T, A priori theoretical arguments, empirical criteria for distribution choice and previously used methods of discrimination between candidate distributions are discussed. The effects which method of parameter estimation, treatment of outliers, inclusion of large historical flood values, data transformations and causal composition of the flood population may have on choice of distribution are also considered,

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Grouping basins for regional flood frequency analysis

Cited by 55 publications

References 2 publications

Homogeneous region delineation based on annual flood generation mechanisms

Homogeneous region delineation based on annual flood generation mechanisms

Análise Regional De Vazão Mínima De Referência Na Região Centro-Sul Do Estado Do Espírito Santo

Factors affecting choice of distribution for flood series

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