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Ograniczanie skutków susz i powodzi przez zwiększanie małej retencji wód – przedsięwzięcia poprawiające bilans wodny

100%
Kopczyk M.
Kontrola Państwowa
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2016
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vol. 61
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issue 2 (367)
104-114
EN
The Supreme Audit Office has conducted the audit of the reduction of the impact of droughts and floods through increasing the small retention of waters. The main objective of the audit was to evaluate the implementation, by public administration bodies, of the tasks related to this issue in the years 2011-2013 and in the first half of 2014. The audit comprised the identification of threats related to floods and droughts, and the needs for small water retention development. Also, the audit covered the activities undertaken in order to perform tasks related to small retention and their effects.
2
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Application and verification of a water balance model with distributed parameters (on the example of Rega river basin)

100%
Pokojska P., Mikulska M.
Miscellanea Geographica. Regional Studies on Development
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2004
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vol. 11
139-149
EN
The purpose of the study reported was to apply and verify a model of water balance of spatially distributed parameters in a meso-scale river catchment. The model was applied in the basin of Rega river, with the use of meteorological and hydrological measurement data from the years 1956 -1995. In modelling, due account was taken of the land use changes having occurred during the 40-year period considered. The output from modelling was constituted by the raster maps of area evaporation, surface runoff and supply of the underground water resources. On the basis of these results the magnitude of outflow and the structure of water balance were calculated for three river gauge profiles. The deviations of the model-based calculated outflow values from the measured ones were maximally equal +10% for the entire 40-year period and +20% in one of the 5-year sub-periods.
3
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Causes and course of climate change and its hydrological consequences in the Greater Poland region in 1951-2020

75%
Marsz A. A., Sobkowiak L., Styszyńska A., Wrzesiński D.
Quaestiones Geographicae
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2022
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vol. 41
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issue 3
183-206
EN
The paper presents effects of changes in climatic elements in the Greater Poland region (Poland), their causes and consequences for shaping the water balance of this area, copying with the most severe water deficit in Poland. The study period covers 70 years (1951–2020). The research identified an abrupt and significant change in the climate of Greater Poland, which started between 1987 and 1989, concerning not only air temperature but also a wider spectrum of climatic elements. The change in the state of the climate, which covers the entire Atlantic-Eurasian circulation sector, re-sults from a sudden change in the macro-circulation conditions in the middle troposphere (500 hPa). The reason for the change in the mid-tropospheric circulation is an equally abrupt and simultaneous change in the intensity of the ocean heat transport by the North Atlantic thermohaline circulation (NA THC). Climate change observed in Greater Poland is manifested in an increase in sunshine duration (SD) and air temperature, a decrease in relative humidity, a change in the cloud structure, and an increase in the degree of sky coverage. The main, physical reason for an increase in air tempera-ture is a rapid and strong increase in SD in the warm half-years, which began after 1988, and a significant increase in the frequency of positive North Atlantic Oscillation (NAO) phases in winters. The ongoing climate change entails various effects, among which the most important is considered to be hydrological consequences. The water balance of Greater Poland is becoming increasingly unfavourable, mainly as a result of a rapid increase in field evaporation.
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