H. Madsen et al., ESTIMATION OF REGIONAL INTENSITY-DURATION-FREQUENCY CURVES FOR EXTREME PRECIPITATION, Water science and technology, 37(11), 1998, pp. 29-36
Citations number
8
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
Regional estimation of extreme precipitation from a high resolution ra
in gauge network in Denmark is considered. The applied extreme value m
odel is based on the partial duration series (PDS) approach in which a
ll events above a certain threshold level are modelled. For a prelimin
ary assessment of regional homogeneity and identification of a proper
regional distribution L-moment analysis is applied. To analyse the reg
ional variability in more detail, a generalised least squares regressi
on analysis is carried out that relates the PDS model parameters to cl
imatic and physiographic characteristics. The analysis reveals that th
e mean annual number of extreme events varies significantly within the
region, and a large part of this variability can be explained by the
mean annual rainfall. The mean value of the exceedance magnitudes can
be assumed constant for intensities with durations less than one hour.
For larger durations a pronounced metropolitan effect is evident, the
mean intensities in the Copenhagen area being significantly larger th
an found in the rest of the country. With respect to second and higher
order moments the region can be considered homogeneous for intensitie
s with durations less than 24 hours. A regional parent distribution is
identified as the generalised Pareto distribution. (C) 1998 Published
by Elsevier Science Ltd. All rights reserved.