trmm rainfall estimative coupled with bell (1969) methodology for extreme rainfall characterization
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2015
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Abstract
The lack of rainfall data in Brazil, and, in particular, in Rio Grande do
Sul State (RS), hinders the understanding of the spatial and temporal
distribution of rainfall, especially in the case of the more complex extreme
events. In this context, rainfall's estimation from remote sensors is seen
as alternative to the scarcity of rainfall gauges. However, as they are
indirect measures, such estimates needs validation. This paper aims to
verify the applicability of the Tropical Rainfall Measuring Mission (TRMM)
satellite information for extreme rainfall determination in RS. The analysis
was accomplished at different temporal scales that ranged from 5 min to
daily rainfall while spatial distribution of rainfall was investigated by
means of regionalization. An initial test verified TRMM rainfall estimative
against measured rainfall at gauges for 1998–2013 period considering
different durations and return periods (RP). Results indicated that, for the
RP of 2, 5, 10 and 15 years, TRMM overestimated on average 24.7% daily
rainfall. As TRMM minimum time-steps is 3 h, in order to verify shorter
duration rainfall, the TRMM data were adapted to fit Bell's (1969)
generalized IDF formula (based on the existence of similarity between the
mechanisms of extreme rainfall events as they are associated to convective
cells). Bell`s equation error against measured precipitation was around
5–10%, which varied based on location, RP and duration while the coupled
BELL+TRMM error was around 10–35%. However, errors were regionally
distributed, allowing a correction to be implemented that reduced by half
these values. These findings in turn permitted the use of TRMM+Bell
estimates to improve the understanding of spatiotemporal distribution of
extreme hydrological rainfall events.
| Reference Key |
bernardi2015proceedingstrmm
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|---|---|
| Authors | ;E. Schiavo Bernardi;D. Allasia;R. Basso;P. Freitas Ferreira;R. Tassi |
| Journal | gruppe interaktion organisation zeitschrift fur angewandte organisationspsychologie |
| Year | 2015 |
| DOI |
10.5194/piahs-369-163-2015
|
| URL | |
| Keywords |
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