The negative impact of storage reservoirs on the environment has been well documented, but it appears that under certain circumstances these reservoirs can also help to protect biodiversity. The distribution of adult dragonflies and damselflies was studied in relation to eight environmental variables, in an upland storage reservoir and its feeder rivers located in South-East Poland (East-Central Europe). A total of 25 species were recorded, including 22 in the reservoir. Submerged and floating plants, width of the shallow littoral zone and the water movement/current were found to be the key drivers of the species distribution (pCCA, NMDS). Five species (Ischnura elegans, Sympetrum sanguineum, Platycnemis pennipes, Calopteryx splendens and Erythromma viridulum) were responsible for over 70% of the dissimilarities between the riverine and reservoir sites (SIMPER). In addition, Ischnura elegans, Orthetrum albistylum and Calopteryx virgo were distinguished as the indicator species (IndVal analysis) for the upland river-reservoir hydrological system. Our results highlight some design features of reservoirs that may help to maintain the diversity of odonates, as well as many other groups of aquatic organisms, as the former are well-known indicators of general biodiversity.

One of the important applications of CFD technique is modelling of the air distribution systems in ventilated and airconditioned areas. In this paper, numerical modelling was used to predict airflow in the air-conditioned driver's cabin of a modern rail vehicle. The aim of this study was to investigate indoor thermal and humidity conditions with the use of ANSYS CFX code. Therefore, the numerical model of the cabin was prepared in the presence of a driver. The boundary conditions were developed on the basis of the heat and moisture balance of the object. The air parameters like temperature, humidity and velocity were verified. Particular attention was paid to maintenance of optimal internal conditions due to the presence of a driver for 6 different cases of air distribution. The simulation results were compared with direct calculation results. For each of the studied cases, there were substantial differences in the distributions of air velocity and temperature. In any case, the maximum permissible air temperature and humidity were not exceeded globally. The recommended air velocities were exceeded locally.