| A scale-invariance analysis of space and time rainfall events monitored by
meteorological radar over the area of Rome (Italy) is proposed. The study of
the scale-invariance properties of intense precipitation storms,
particularly important in flood forecast and risk mitigation, allows to
transfer rainfall information from the large scale predictive meteorological
models to the small scale hydrological rainfall-runoff models.
Precipitation events are monitored using data collected by the polarimetric
Doppler radar Polar 55C (ISAC-CNR), located 15 km Southeast from downtown.
The meteorological radar provides the estimates of rainfall intensity over
an area of about 10 000 km2 at a resolution of 2×2 km2 in
space and 5 min in time.
Many precipitation events have been observed from autumn 2001 up to now. A
scale-invariance analysis is performed on some of these events with the aim
at exploring the multifractal properties and at understanding their
dependence on the meteorological large-scale conditions. |