Some characteristics of a daily rainfall regime based on the Dry Day Last Rain index (DDSLR)
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Data publicació2012-06
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Abstract
The Dry Day Since Last Rain index, DDSLR,
quantifies for every recording day the number of consecutive
preceding days with daily rainfall below a threshold. In
essence, DDSLR may quantify the hydrologic stress generated
by consecutive days of rainfall deficit taking into account
some daily rainfall thresholds associated with the
resolution of the pluviometer, evapotranspiration, runoff
and thin layer saturation processes. A detailed analysis of
DDSLR at daily and annual scales and for the whole recording
period permits a complete description of the daily
rainfall deficit regime and induced hydrologic stress. These
characteristics have been derived for 0.1, 1.0, 5.0 and
10.0 mm/day thresholds for 93 years (1917–2009) of continuous
daily rainfall records at the Fabra Observatory
(Barcelona, NE Spain). Time trends on chronological series
of DDSLR are determined and statistically tested for every
calendar day. Fourier series analysis applied to four calendar
day statistics (number of non-null DDSLR, average,
standard deviation and maximum of DDSLR) leads to
detection of the dominant periodicities, taking as fundamental
periodicity the 365 days of the year. The best statistical
model reproducing the empirical distribution of DDSLR,
year by year, for every calendar day and for the whole
recording period, is also investigated. Whatever the time
scale considered, the Poisson-gamma model is assumed due
to the non-negligible number of null DDSLR. Finally, time
trends on extreme series of annual DDSLR, the appropriate
statistical model for these series (the generalised logistic
distribution, GLO), together with an estimation of DDSLR
for several return periods, permit the description of the
expected main future patterns of this index. In this way,
current and next future hydrologic stress at the Fabra Observatory
and neighbouring areas become characterised.
CitacióLana, F. [et al.]. Some characteristics of a daily rainfall regime based on the Dry Day Last Rain index (DDSLR). "Theoretical and applied climatology", Juny 2012, vol. 109, núm. 1-2, p. 153-174.
ISSN0177-798X
Versió de l'editorhttp://www.springerlink.com/content/32256u7h0h710128/fulltext.pdf
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Theor Appl Climatol.pdf | 1,009Mb | Accés restringit |