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Atmosphere 2018, 9(8), 303; https://doi.org/10.3390/atmos9080303

Characteristics of the Underestimation Error of Annual Maximum Rainfall Depth Due to Coarse Temporal Aggregation

Deptartmen of Civil and Environmental Engineering, University of Perugia, via G. Duranti 93, 06125 Perugia, Italy
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Received: 5 July 2018 / Revised: 26 July 2018 / Accepted: 30 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Precipitation: Measurement and Modeling)
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Abstract

This study analyzed all characteristics of the error committed in evaluating annual maximum rainfall depth, Hd, associated with a given duration, d, when data with coarse temporal aggregation, ta, were used. It is well known that when ta = 1 min, this error is practically negligible while coarser temporal aggregations can determine underestimation for a single Hd up to 50% and for the average value of sufficiently numerous series of Hd up to 16.67%. By using a mathematical relation between average underestimation error and the ratio ta/d, each Hd value belonging to a specific series could be corrected through deterministic or stochastic approaches. With a deterministic approach, an average correction was identically applied to all Hd values with the same ta and d while, for a stochastic correction, a thorough knowledge of the statistical characteristics of the underestimation error was required. Accordingly, in this work, rainfall data derived from many stations in central Italy were analyzed and it was assessed that single and average errors, which were both assumed as random variables, followed exponential and normal distributions, respectively. Furthermore, the single underestimation error was also found inversely correlated to the corresponding annual maximum rainfall depth. View Full-Text
Keywords: rainfall data; temporal aggregation; annual maximum rainfall depths; underestimated errors rainfall data; temporal aggregation; annual maximum rainfall depths; underestimated errors
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Morbidelli, R.; Saltalippi, C.; Flammini, A.; Picciafuoco, T.; Dari, J.; Corradini, C. Characteristics of the Underestimation Error of Annual Maximum Rainfall Depth Due to Coarse Temporal Aggregation. Atmosphere 2018, 9, 303.

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