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Descripción
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| Estimates of the magnitude of extreme hydrological events, such as floods, are essential to design and manage hydraulic structures. Such a magnitude is usually required at locations where short hydrological data series are available; or at locations where no hydrological data are available, as the gauging network is limited. A regional analysis is necessary to reduce the uncertainty of such estimates by using the information available at existing gauged sites, compensating the lack of data in time for the availability of data in space. Moreover, hydrological events should be studied through a multivariate approach as dependence is found between their representative variables, being necessary to consider the joint behaviour of the variables for predicting a suitable estimate of the magnitude of the studied event. However, multivariate regional hydrological frequency analyses are rarely considered in the literature and/or practice. In the present study, an exhaustive procedure for the application of the well-known regional index-flood model regarding its bivariate approach is presented. The procedure considers developments in copulas, multivariate quantiles and the multivariate index-flood model, providing practical recommendations for its implementation. It is applied to a case study in Spain, in which observed series of peak flow and associated hydrograph volume are considered for estimating the flood magnitude for a given joint return period. As a result, a curve consisting of volume-peak events is obtained for a given return period at the target site, and practitioners can decide with more flexibility which one of these events should be the design event according to the specific focus. Besides, the multivariate regional approach can be considered for characterising the multivariate distribution of hydrological variables (e.g. peak flow and volume) for estimating the return period of the structure failure. | |
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Internacional
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Si |
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Nombre congreso
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69th National Conference of the Canadian Water Resources Association WATER MANAGEMENT AT ALL SCALES: REDUCING VULNERABILITY AND INCREASING RESILIENCE |
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Tipo de participación
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960 |
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Lugar del congreso
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Montreal, Canadá |
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Revisores
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Si |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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25/05/2016 |
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Fecha fin congreso
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27/05/2016 |
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