"Regional methods for flood estimation are examined and discussed, with reference to a three level regionalization sheme, to take into account the relative role played by spatial and sampling variability of the parameter estimate. At the first level, the flood distribution is identified and its shape parameters are estimated. Spatial variability is much smaller than sampling variability and the homogeneity hypotesis can be made. At the second level, the estimation of scale parameter requires an exploitation of the physical meaning of the flood distribution parameters to transfer information from rainfall to flood. The homogeneity hypotesis still holds for the rainfall distribution scale parameter, even if a spatial interstation correlation must be taken into account. At this level, the estimation of the flood distribution scale parameter could require some geomorphologic variates. The purpose of the third level of regionalization is to obtain regional estimation of the mean annual flood (MAF). Its spatial variation is generally much higher than its sampling variation, and hence, the MAF is the least suitable parameter for regional estimating. This leads to the need for causative relationships between MAF and geomorpho-climatic parameters, which can be of a merely empirical regressive type or of a more physically based conceptual type."

REGIONAL FLOOD ESTIMATION METHODS

ROSSI, Fabio;VILLANI, Paolo
1998

Abstract

"Regional methods for flood estimation are examined and discussed, with reference to a three level regionalization sheme, to take into account the relative role played by spatial and sampling variability of the parameter estimate. At the first level, the flood distribution is identified and its shape parameters are estimated. Spatial variability is much smaller than sampling variability and the homogeneity hypotesis can be made. At the second level, the estimation of scale parameter requires an exploitation of the physical meaning of the flood distribution parameters to transfer information from rainfall to flood. The homogeneity hypotesis still holds for the rainfall distribution scale parameter, even if a spatial interstation correlation must be taken into account. At this level, the estimation of the flood distribution scale parameter could require some geomorphologic variates. The purpose of the third level of regionalization is to obtain regional estimation of the mean annual flood (MAF). Its spatial variation is generally much higher than its sampling variation, and hence, the MAF is the least suitable parameter for regional estimating. This leads to the need for causative relationships between MAF and geomorpho-climatic parameters, which can be of a merely empirical regressive type or of a more physically based conceptual type."
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/1631505
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact