Distributions of microcanonical cascade weights of rainfall at small timescales

• Autorzy: Licznar P. , Schmitt T.G. , Rupp D.E.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

rainfall disaggregation; microcanonical cascade model; randomization; cascade weights

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2011
• Tom: Vol. 59, no. 5
• Strony: 1013--1043
• Opis fizyczny: Bibliogr. 23 poz.

Twórcy

autor

Licznar P.

autor

Schmitt T.G.

autor

Rupp D.E.

• Institute of Environmental Engineering, Wroclaw University of Environmental and Life Sciences, Wrocław, Poland,

Bibliografia

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