New PDF release: Allowance for Discretization in Hydrological and
By I.J. Dwyer, D.W. Reed
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Additional info for Allowance for Discretization in Hydrological and Environmental Risk Estimation
Southampton. Bntish Hydrological Society, London. pp. 59. W. 1994. Effective fractal dimension and corrections to the mean of annual maxima. j Hydrol] 157, 13-34. S. & Tripathi, N. 1973. Relationship of the clock-hour to 60-min and the observational day to 1440-min rainfall. Indianj Met. Geophys. 24, 279282. M. T. 1958. Generalizing of rainfall-intensity-frequency data. IUGGIIAHS publicationno. 43, 499-506. M. 1990. L-moments: analysis and estimation of distributions using linear combinations of order statistics.
5 which is supplemented by numerical examples. Where applicable, the conclusions of each chapter are consolidated into practical recommendations for malkng corrections to mean period maxima (or minima). Moments of higher order than the mean do not, in general, require correction. The special case of daily rainfall Special guidelines apply when converting fixed to true maxima for daily rainfall. As well as the correction factor p= I. 17 may also be employed: the former for sites with rainfall regimes which tend to generate concentrated events of short duration (such as tropical storms), the latter for sites with rainfall regimes tending to generate longer events (such as those produced by large frontal systems).
The qualifier "on average" should be stressed, however, for correction factors may change systematically with time scale at a particular site if, for example, the typical rainfall profile changes systematically (see Chapter 4). The analysis of several daily rainfall records suggested that the growth rate, as measured by parameter b, is generally lower than for hourly records but still rather variable. 323 Cape Town . 353 Durban . 106 Johannesburg . 292 Richmond . 303 Upington . 357 Brisbane Hobart Melbourne Perth Sydney In contrast, the variograms for rainfall do change systematically with time scale: as the resolution becomes finer, a better appreciation of the fractal behaviour is obtained.
Allowance for Discretization in Hydrological and Environmental Risk Estimation by I.J. Dwyer, D.W. Reed