Daily maximum annual rainfall statistical regionalization in Andalusia

Abstract

The annual maximum daily rainfall (Amdr) is an important variable to model the runoff, justifying its study. This work aimed at regionalize the Amdr for the region of Andalusia through the spatialization of parameters of the probability distribution. Daily rainfall data between the years of 2001 and 2015 from 56 meteorological stations in Andalusia were evaluated and adjusted to ten probability distributions, as also the possibility of tendencies in the data was explored. The Gumbel II distribution was the one with better results for 20 of the 56 meteorological stations. Decreasing tendencies in three meteorological stations were verified. The Amdr was estimated for the payback periods of 10, 20, 50, 100 and 1000 years, obtaining average values of 76.76, 90.75, 110.79, 127.69 and 201.23 mm, respectively. Maps with the distribution of the parameters α and β of the Gumbel II distribution for Andalusia were obtained, apart from maps with the Amdr distribution for each payback period.

Hazard Characterization of the Annual Maximum Daily Precipitation in the Southwestern Iberian Peninsula (1851–2021)

“…Applying the Gumbel type II distribution to observatories of Southern Spain for the return periods shown in Table 3, Ref. [79] estimated the following P MD values: 20 years (90.7 mm), 50 years (110.8 mm), and 100 years (127.7 mm). It is worth mentioning that, although it responds to an estimation of several seasons, the results obtained with this model are similar to those shown in Table 3.…”