Regional Rainfall Depth–Duration–Frequency Equations for an Alpine Region

Marco Borga (), Claudia Vezzani and Giancarlo Fontana

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2005, vol. 36, issue 1, 235 pages

Abstract: In this paper the scaling hypotheses are applied to annual maximum series of rainfall depth for different rainfall duration to derive the depth–duration–frequency (DDF) curve. It is shown that, based on the empirically observed scaling properties of rainfall and some general assumptions about the cumulative distribution function for the annual maximum of the rainfall depth, it is possible to derive a simple DDF relationship. This general framework provides a basis for the generation of maps that can be used to infer DDF curves at any point of a particular area. Data from a dense raingauge network in a mountainous region in north-eastern Italy (the Trentino Province) are used to clarify the methodology for the construction and regionalization of the DDF relationship. The geographical variation of short-duration (i.e., less than 60 xmin) rainfall extremes is also evaluated by using the same framework. It is found that depth–duration ratios, defined as the ratios of the t-min to the 60-min rainfall depths of the same return period, may be considered independent of return period and geographical location for any storm duration less than 60 min. Copyright Springer 2005

Keywords: rainfall process; extreme rainfalls; statistical modelling; Gumbel distribution; scaling processes (search for similar items in EconPapers)
Date: 2005
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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DOI: 10.1007/s11069-004-4550-y

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