Distributions of microcanonical cascade weights of rainfall at small timescales |
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Authors: | Pawe? Licznar Theo G Schmitt David E Rupp |
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Institution: | (1) Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA;(2) School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW, 2052, Australia |
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Abstract: | Empirical frequency distributions of multiplicative cascade weights, or breakdown coefficients, at small timescales are analyzed
for 5-min precipitation time series from four gauges in Germany. It is shown that histograms of the weights, W, are strongly deformed by the recording precision of rainfall amounts. A randomization procedure is proposed to statistically
remove the artifacts due to precision errors in the original series. Evolution of the probability distributions of W from beta-like for large timescales to combined beta-normal distribution with a pronounced peak at W ≈ 0.5 for small timescales is observed. A new 3N-B distribution built from 3 separate normal, N, distributions and one beta,
B, distribution is proposed for reproduction of the empirical histograms of W at small timescales. Parameters of the 3N-B distributions are fitted for all gauges and analyzed timescales. Microcanonical
cascades models with a generator based on 3N-B distributions are developed and their performance at disaggregating precipitation
at 1280-min intervals down to 5-min intervals is evaluated. |
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Keywords: | |
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