Application Of The Index-flood Method To The
Regionalization Of Flood Peak Discharges On The
Portugal Mainland
Author(s)
M. M. Portela & A. T. Dias
Abstract
The regional analysis of flood peak discharges is an important tool that enables
more reliable estimates of flood quantiles at watersheds without or with
insufficient flood data.
Usually, the flood regional analysis combines two main issues concerning,
first, the identification of homogenous regions in terms of flood peak discharges
and, second, the establishment of, for each region previously recognized as
homogenous, a flood frequency distribution model.
One of the most widespread procedures for flood regionalization is the
index-flood method. As the main assumption, the method considers that the
statistical distribution of the floods within a homogenous region is similar except
for a scale parameter or index that reflects the specific local features.
The index-flood method was applied to the Portugal mainland, based on the
records of annual maximum instantaneous discharges at 120 Portuguese stream
gauging stations. As result, six homogenous regions were identified and the
models applicable to each region to estimate flood quantiles established. The
adopted index-flood was the mean annual flood, that is, the flood having a peak
discharge with a return period of 2.33 years.
In this paper the general description of the method as well as some of the
results achieved for the Portugal mainland are briefly presented.
Keywords: flood regionalization, annual maximum instantaneous discharges,
index-flood, homogeneity test, local and regional frequency distribution curves.
Keywords
flood regionalization, annual maximum instantaneous discharges,
index-flood, homogeneity test, local and regional frequency distribution curves.
Related Book
Other papers in this volume
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