The paper presents the results of the survey of the daily load of total nitrogen outflowed with drainage system and ditches in Lower Silesia. The volume of daily load shows large seasonal variation. The maximum daily loads were found in object located in the submontane area. These loads amounted for the drainage systems 6,27 kg N d-1 ha-1 and for the ditches were noted until 12,2 kg N d-1 ha-1. Significantly lower values were found in the lowland object. In lowland area, risk of polluting the receiver with total nitrogen effluents from agricultural areas, occurs mainly during early spring. At the object located in the submontane area, which is characterized by greater rainfall, there is a second critical period attributable to the July and August. Load of nitrogen outflowed from submontane catchment during the year was 75,5 kg N ha-1, while from lowland's catchment outflowed much less nitrogen - 12,7 kg N ha-1. Con-ducted research and analysis clearly show, that the size of nitrogen load outflowed from catchment is determined, to a large extent, the course of weather conditions, particularly amount of rainfall. ...
The paper presents the methodology to determine changes in the geometric structure containing the conducted measurements and feasible variants of calculations. The object of detailed studies, whose results are presented in this work, is the suspended roof of the open-air theatre in Koszalin. In the research conducted since 2006, a database that contains the results of more than 40 periodic measurements of the structure carried out in different (registered during measurements) external conditions (including different temperature, snow and ice load) was used. The previous research conducted at this facility, among others, (Deska 2013, Kaczmarek and Śpiewak 2014b), as well as for other structures (Odziemczyk 2014) draws attention to the important influence of the temperature load of steel structures and hence the need for its consideration when assessing the geometric state. Electronic total station and the polar method with freestationing were used in periodic measurements. The calculations used a comparative method (differences of coordinates) and tools of a statistical analysis as well as developed calculation models based on them. The results obtained using both approaches were compared and assessed by indicating both their possibilities and significant limitations. The application of the suggested methodology provides the correct determination of changes in the ...
