Statistical method for verification of technical principles of channel model construction for hydraulic research was introduced. Method and statistical equations applied for model construction accuracy analysis were discussed. Problems of model construction accuracy influence on measurement of flow capacity in two-stage compound open channel was described.
Celem pracy była wizualizacja zjawiska rozprzestrzeniania się zanieczyszczeń w korycie dwudzielnym, polegająca na wprowadzeniu w obszar przepływu wody wskaźnika, który szybko rozprzestrzenia się na cały przekrój strumienia. Szybkość rozprzestrzeniania się wskaźnika w strumieniu wody zależy od wielu czynników, lecz najistotniejsza jest struktura pulsacji prędkości wody. Jednym ze sposobów opisu burzliwego ruchu wody jest opis statystyczny, który występujące w nim wielkości hydrodynamiczne traktuje jako wielkości losowe uśrednione w czasie. Pomiary przeprowadzono na modelu hydraulicznym o wymiarach16 x 2,08 m.
The aim of this study is to analyze the degree of impact of different forms of tourist infrastructure on the natural environment of the riparian zone of Białe Lake. The spatial variation of the index of impact on environment was calculated (MIKA 2004, FURGAŁA et al. 2010) depending on the distance from the shoreline. The analysis was carried out in fixed minimal mapping units and in the buffer zones with segmentation based on shoreline type criterion and distance from the lake.
Aim of the study The aim of the study was to determine the parameters of the stream transport capacity using turbulent diffusion coefficients using the imaging technique and to compare them with the coefficients obtained as a result of the measurement with the ADV (acoustic Doppler velocimeter) probe in a compound channel. Materials and methods Model tests were carried out on a physical concrete model of a straight open channel with symmetrically complex trapezoidal cross section. On the model, the study of particle motion was carried out using the digital image recording technique with the analysis of the motion of the dosed indicator (solid particles), (PIV) (Particle Image Velocimetry), allowing to determine the basic parameters characterizing the process of their transport in the subsurface layer of water in the channel. Results and conclusions Primary analysis of test results obtained in laboratory conditions using the PIV (Particle Image Velocimetry) technique based on particle trajectory (in Lagrange’s approach), in comparison with the results of calculations of turbulence characteristics based on measurements with the ADV probe (in Euler’s approach), show significant differences between the results obtained. Turbulence intensity, vortex length, and values of turbulent diffusion coefficients, calculated on the basis of Lagrange’s autocorrelation function, are much higher than the values calculated according to Euler’s function.