One of the manifestations of climate changes is the occurrence of a greater number of precipitation events, characterized by greater rain intensity that affects the economic stability of cities. Gdańsk is an example of a city in which such events have occurred since the beginning of the twenty-first century. Due to the altitude differences in the area of Gdańsk city (between -2 m and 180 m a.s.l.), the occurrence of extreme atmospheric precipitation almost immediately causes hydrological effects in the water network consisting of several streams of montane character, which flow eastwards from the plateau of the Kashubian Lakeland. Meteorological stations of the National Meteorological Service (IMGW-PIB) are located in the coastal zone (Port Północny/Northern Port, Świbno) and in the highest part of the city (the Rębiechowo airport). Because this is insufficient, the city of Gdańsk has been expanding the local rain monitoring network since 2001, currently having reliable 10-year observation data sequences. The said network is operated by the Gdańsk Water municipal company.Climate changes resulting in different characteristics of rainfall episodes in Gdańsk naturally influence the determination of the probability of their occurrence. According to the rainfall model developed by Bogdanowicz and Stachy at the turn of the 20th and 21st centuries, at least 4 rainfall events lasting for over 8 hours in the last 17 years should be classified as a 100-year rain event. One of these extended the parameters of a 300-year rain event; whereas we asses the rain in the year 2016, when even 170 mm of rainfall was recorded on July 14, as at least a 500-year rain event. During this period, several-minute events were also recorded, which also exceeded the parameters of a 100-year rain event.The paper presents precipitation models for the region of Gdańsk. Based on the maximum annual daily rainfall from Rębiechowo meteorological station from the years 1974-2017, an analysis of changes in precipitation values corresponding to certain probabilities of occurrence was conducted. An assessment was also made of the projected decrease in the value of precipitation in relation to hydro-technical constructions, road-engineering structures, and rainwater drainage systems in view of changing legal regulations, as well as the latest trends related to the management of rainwater.
Aim of the study The paper presents the results of hydraulic calculations (numerical simulations), which were conducted in order to investigate the role of floodplain (polder) adjacent to the left bank of Cisowska Struga in Gdynia downstream of Hutnicza street in the process of retention and transformation of flood waves occurring in this river due to heavy rainfall. The paper also addresses the issue of the impact of potential changes in the development of the retention area under consideration for the flood risk in Rumia. Material and methods In order to perform hydraulic calculations, mathematical modelling was used. All hydraulic calculations of flood wave transformation in channels and floodplains were performed using the HEC-RAS software and the data on characteristic flows obtained from the available hydrological calculations. Results and conclusions In the light of the obtained results, it should be stated that the analysed retention area between Hutnicza street in Gdynia and the railway line is of high hydrological significance. Potential reduction of the retention capacity of this area will negatively affect the transformation process of flood waves in the Cisowska Struga on the analysed section. At the outlet section in the area of Dębogórska street and further in Rumia, the water level will be elevated, and flood waves will reach there faster. Due to the potential increase of the flood risk in Rumia, this is undesirable.
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