Are extreme rainfall intensities more frequent? Analysis of trends in rainfall patterns relevant to urban drainage systems

摘要

The fact that climate change is affecting the intensity and frequency of rainfall is well accepted innthe scientific community. This is backed by a multitude of reports on the basis of daily rainfallnseries analysis; however, little research is available for short duration intensities. Due to itsnsignificant influence on the behaviour of urban drainage, it is critical to investigate the changes innshort duration rainfall intensities. In this study different intensities relevant for the urban drainagenand the total rainfall per rain event are analysed. The trend is investigated using the Mann-nKendall test. The rainfall series analysed are from the alpine region Tyrol. The results presentndifferences depending on the duration of the intensity and the series considered, however annincrease in the number of extreme events is detectable for short durations for the most series.