TITLE:
Orographic Effects on Extreme Rainfall at Different Durations: A Case Study in Campania Region (Southern Italy)
AUTHORS:
Pierluigi Furcolo, Anna Pelosi
KEYWORDS:
Orography, Extreme Rainfall, Regional Models, Orographic Amplification, IDF Curves
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.6 No.11,
November
21,
2018
ABSTRACT: Long-term probabilistic prediction of extreme rainfall at the regional scale is
a significant tool in the mitigation of hydro-geological disasters: it actually
provides the starting point in the design of strategic hydraulic infrastructures
and emergency plans. A crucial task of regional estimation of extreme rainfall
is how to include the complex effects of orographic barriers in a mathematical
model for Intensity-Duration-Frequency (IDF) curves. Here, an analysis of
how orography can affect extreme rainfall at different durations is presented
for three orographic systems that are very relevant for hydrological risk assessment
in the Campania Region in Southern Italy. Then, we introduce a
power law model to link the amplification factor to the duration, thus allowing
a simple and effective enhancement of the IDF model in mountainous
areas.