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Integrated Monitoring of the Natural Environment programme has been implemented in Poland in 1993. After 11 years of observations collected data series have been summarized in 2006. IMNE base station "Pożary" is located within Kampinos National Park near Warsaw. This paper presents results of precipitation, river runoff and groundwater level measurements performed in this station. Between 1994 and 2004 strong decrease of annual precipitation totals has been observed in "Pożary" research basin. As a result continuous lowering of groundwater levels appeared in observed wells. Due to decreasing of groundwater recharge, river runoff shows strong variability and tendency to disappear in summer period.
The aim of work was comparison of two water balance models with different degree of complexity to predict soil moisture in small hilly loess catchment and to compare results of the modeling with field measurement done with TOR probes. In the first "bucket" model soil is treated as a tank for water with definite capacity, in the second more sophisticatcd model elaborated in the FEFLOW software, soil properties are described by retention curve and soil moisture pattern is obtained as a solution of Richards equation. In both models actual evapotranspiration is modeled by FAO56 method. The results obtained from both models were acceptable with similar determination coefficient of about 0,8. However, simulation of soil moisture with the FEFLOW model is more accurate although it requires more parameters and seeking for stable numerical solution. On the other hand it is also more suitable to use in hilly terrain where horizontal soil water fluxes must be taken into account.
The purpose of this study was to obtain and prove the methods of catchment regionalization in case of annual maximum floods. Identification of Polish rivers was hold on the basis of regional frequency analyses including recognition of homogenous regions in their physical properties and river flow parameters. Results indicate the division on two regional groups: mountain and lowland catchments. Statistical tests prove the obtained regionalization and allow calculating the regional probability curves for these two catchment groups. Obtained results may be helpful in the analysis of floods in ungauged catchments and these where hydrological observations were held in a short period especially when dependency of the maximum probable flows in analysed catchments from their physico-geographical features was proved.
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