| Autor: |
Licznar, Paweł, Burszta-Adamiak, Ewa, Kotowski, Andrzej, Siekanowicz-Grochowina, Katarzyna, Oktawiec, Michał |
| Zdroj: |
Ochrona Srodowiska; 2018, Vol. 40 Issue 3, p21-28, 8p |
| Abstrakt: |
Accurate dimensioning of drainage systems requires assumption of reliable design rainfall intensities as a function of its duration and probability of exceeding according to PN-EN 752:2017. Design rainfall intensities are determined by application of an adequate rainfall model that is based on statistical analysis of local precipitation time series recorded at high time resolution and covering a period of last 30 years minimum. Beside application of the obsolete Błaszczyk's formula, the Bogdanowicz-Stachý's probabilistic maximum precipitation model based on 1960-1990 rainfall records from 20 rain gauges (Institute of Meteorology and Water Management) becomes increasingly popular in Poland. However, this model does not support full coverage of the country and is based on the discontinuous regionalization. Evolving climate conditions demand validation of the model for use throughout the country. This paper presents results of verification of the actual values of rainfall intensities derived from 30-year time series from the period of 1986-2015 for given probabilities of exceeding, in comparison to the estimates delivered by the Bogdanowicz-Stachý's model. The conducted analysis undermines legitimacy of the simple regionalization concept for precipitation in Poland. Moreover, rainfall intensity values calculated by Bogdanowicz-Stachý's model for probabilities of p = 100% and p = 50% are mostly understated and for p = 20% and p = 10% are overstated in comparison to actuals (1986-2015). The results of the research confirm the need to replace Bogdanowicz-Stachý's model with "new generation" local maximum precipitation models developed as part of the PANDa (the Polish Atlas of Rainfall Intensity) atlas, not only to obtain full coverage of the country, but also to make the values of rainfall intensities reliable for design of drainage systems. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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