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Do Changes of Rainfall Trends Affect Choice of Drainage Systems?

Kubiszyn Katarzyna, Łochańska Dorota

Civil and Environmental Engineering Reports

2022

Vol. 32, no. 4

389--409

Precipitation is one of the main factors causing surface, linear and landslide erosion. Their influence on erosion processes is determined by such parameters as: precipitation frequency, amount, duration and intensity. These features affect the rate of infiltration and the intensity of surface runoff, and thus the occurrence, course and effectiveness of erosion processes [2, 3, 4]. The aim of research was to analyse the 40-years of rainfall measurements data from the Lubuskie Voivodeship and inspect whether occurring of heavy rains are random events or maybe indicate some long period trends. To analysis was used non-parametrical Mann Kendall test and correlation test. What is more the authors’ prepared a path of selecting the optimal dewatering system, where would be taken into consideration ground stability and changes in the rainfall trends. For this purpose, the paper contain short overview existing dewatering systems which are used to reducing risk of landslides.

Precipitation variability and tendency in Kraków for the period 1850-1997 related to circulation patterns

Twardosz R.

Acta Geophysica Polonica

1999

Vol. 47, nr 1

111-133

The paper analyses the long-term variability of precipitation in Kraków and establishes precipitation trends in relation to circulation patterns. Data for annual, semi-annual, seasonal and monthly precipitation totals from the 1850-1997 period was used. Averages, maxima, minima, standard deviations and variability coefficients were presented. Correlation coefficient values were calculated between the precipitation totals and the cyclonicity indices C, determined on the basis of the classification of circulation types proposed by T. Niedźwiedź for the period 1874-1995. The annual precipitation totals did not show any trend. Precipitation variability is characterised by regular fluctuations. In the entire data series it is only in January and July that the precipitation displays any significant trends, which are rising and falling, respectively. The precipitation variability in Kraków shows significant correlation with the fluctuations of the C-index and this correlation was most pronounced in the cold half-year (November-April) and in October.