Turbulent intensity and scales of turbulence after hydraulic jump in rectangular channel
Journal Title: Annals of Warsaw University of Life Sciences – SGGW. Land Reclamation - Year 2016, Vol 48, Issue 2
Abstract
Experimental research was undertaken to investigate the changes in spatial turbulence intensity and scales of turbulent eddies (macroeddies) in a rectangular channel and the influence of the hydraulic jump on vertical, lateral and streamwise distributions of relative turbulence dntensity and scales of turbulent eddies. The results of three tests for different discharges are presented. An intensive turbulent mixing that arises as a result of a hydraulic jump has a significant effect on instantaneous velocity, turbulent intensities and sizes of eddies, as well as their vertical and longitudinal distributions. In the analysed case the most noticeable changes appeared up to 0.5 m downstream the hydraulic jump. In the vertical dimension such an effect was especially seen near the surface. The smallest streamwise sizes of macroeddies were present near the surface, maximum at the depth of z/h = 0.6 and from that point sizes were d ecreasing towards the bottom. The intensive turbulent mixing within the hydraulic jump generates macroeddies of small sizes.
Authors and Affiliations
Adam Kozioł, Janusz Urbański, Adam Kiczko, Marcin Krukowski, Piotr Siwicki
Keywords
Related Articles
- EP ID EP164836
- DOI 10.1515/sggw-2016-0008
- Views 91
- Downloads 0
Effects of cypress knee roughness on fl ow resistance and discharge estimates of the Turkey Creek watershed
In this study effects of cypress knees as vegetation resistance factor on Turkey Creek watershed discharge calculation were analyzed. The Turkey Creek watershed is a 3rd order stream system draining an approximate area o...
The analysis of agritourism accommodation indicators for areas located in the vicinity of national parks
Increasing tourism development makes it an important factor in generating economic growth and employment in the European Union. Due to high environmental attractiveness of many regions, this sector of economy plays an im...
Zmiany warunków termiczno-opadowych w Polsce w latach 1971–2010
W pracy przedstawiono zmiany warunków termiczno-opadowych na obszarze Polski w latach 1971–2010 na podstawie danych z sześciu stacji meteorologicznych (Koszalin, Olsztyn, Poznań, Lublin, Opole i Kraków). Dane te dotyczył...
Effects of environmental changes and human impact on the functioning of mountain river channels, Carpathians, southern Poland
In the northern slope of the Carpathian Mountains and in their foreland, river and stream channels have been significantly transformed by human impact. These transformations result from changing land use in river basins...
Modeling of water flow in multi-channel river system in the Narew National Park
Anastomosing rivers constitute a rare example of multi-channel systems, which used to be very common before the agricultural and industrial development. Presently few of them remain worldwide and the only example in Pola...