Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel
The study presents experimental investigations of spatial turbulence intensity and scales of turbulent eddies (macroeddies) in a rectangular channel and the impact of the hydraulic jump on their vertical and streamwise distributions over a flat and scoured bed. The results of four tests and two diff...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Sciendo
2017-12-01
|
| Series: | Journal of Hydrology and Hydromechanics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/johh-2017-0026 |
| _version_ | 1828852308022132736 |
|---|---|
| author | Kozioł Adam Urbański Janusz Kiczko Adam Krukowski Marcin Siwicki Piotr Kalenik Marek |
| author_facet | Kozioł Adam Urbański Janusz Kiczko Adam Krukowski Marcin Siwicki Piotr Kalenik Marek |
| author_sort | Kozioł Adam |
| collection | DOAJ |
| description | The study presents experimental investigations of spatial turbulence intensity and scales of turbulent eddies (macroeddies) in a rectangular channel and the impact of the hydraulic jump on their vertical and streamwise distributions over a flat and scoured bed. The results of four tests and two different discharge rates are presented. Intensive mixing caused by the hydraulic jump has an impact on the instantaneous velocity, turbulence intensity and sizes of macroeddies, as well as their vertical and longitudinal distributions along the channel. The largest differences in turbulence characteristics were reported directly after the hydraulic jump, above the eroded bed. The interaction between the stream of the increased turbulence and the bed is a direct cause of formation of scour downstream water structures, which has a great effect on overall flow characteristics. The scour hole that arose downstream the jump moderated, in a small degree, the turbulence intensity at its end. Just next to the hydraulic jump only the small longitudinal relative sizes of macroeddies were present, while at the end of the analyzed reach, downstream of the scour, the relative scale reached around 1.5 depth of the stream. |
| first_indexed | 2024-12-12T23:50:36Z |
| format | Article |
| id | doaj.art-82ff637c4f7c4e20877eec16773a85e4 |
| institution | Directory Open Access Journal |
| issn | 0042-790X |
| language | English |
| last_indexed | 2024-12-12T23:50:36Z |
| publishDate | 2017-12-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Journal of Hydrology and Hydromechanics |
| spelling | doaj.art-82ff637c4f7c4e20877eec16773a85e42022-12-22T00:06:43ZengSciendoJournal of Hydrology and Hydromechanics0042-790X2017-12-0165438539410.1515/johh-2017-0026johh-2017-0026Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channelKozioł Adam0Urbański Janusz1Kiczko Adam2Krukowski Marcin3Siwicki Piotr4Kalenik Marek5Department of Hydraulics, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warszawa, PolandDepartment of Hydraulics, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warszawa, PolandDepartment of Hydraulics, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warszawa, PolandDepartment of Hydraulics, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warszawa, PolandDepartment of Hydraulics, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warszawa, PolandDepartment of Civil Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warszawa, PolandThe study presents experimental investigations of spatial turbulence intensity and scales of turbulent eddies (macroeddies) in a rectangular channel and the impact of the hydraulic jump on their vertical and streamwise distributions over a flat and scoured bed. The results of four tests and two different discharge rates are presented. Intensive mixing caused by the hydraulic jump has an impact on the instantaneous velocity, turbulence intensity and sizes of macroeddies, as well as their vertical and longitudinal distributions along the channel. The largest differences in turbulence characteristics were reported directly after the hydraulic jump, above the eroded bed. The interaction between the stream of the increased turbulence and the bed is a direct cause of formation of scour downstream water structures, which has a great effect on overall flow characteristics. The scour hole that arose downstream the jump moderated, in a small degree, the turbulence intensity at its end. Just next to the hydraulic jump only the small longitudinal relative sizes of macroeddies were present, while at the end of the analyzed reach, downstream of the scour, the relative scale reached around 1.5 depth of the stream.https://doi.org/10.1515/johh-2017-0026turbulent intensityeddieshydraulic jumpscour holerectangular channel |
| spellingShingle | Kozioł Adam Urbański Janusz Kiczko Adam Krukowski Marcin Siwicki Piotr Kalenik Marek Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel Journal of Hydrology and Hydromechanics turbulent intensity eddies hydraulic jump scour hole rectangular channel |
| title | Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel |
| title_full | Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel |
| title_fullStr | Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel |
| title_full_unstemmed | Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel |
| title_short | Turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel |
| title_sort | turbulence intensity and spatial scales of turbulence after hydraulic jump over scour hole in rectangular channel |
| topic | turbulent intensity eddies hydraulic jump scour hole rectangular channel |
| url | https://doi.org/10.1515/johh-2017-0026 |
| work_keys_str_mv | AT kozioładam turbulenceintensityandspatialscalesofturbulenceafterhydraulicjumpoverscourholeinrectangularchannel AT urbanskijanusz turbulenceintensityandspatialscalesofturbulenceafterhydraulicjumpoverscourholeinrectangularchannel AT kiczkoadam turbulenceintensityandspatialscalesofturbulenceafterhydraulicjumpoverscourholeinrectangularchannel AT krukowskimarcin turbulenceintensityandspatialscalesofturbulenceafterhydraulicjumpoverscourholeinrectangularchannel AT siwickipiotr turbulenceintensityandspatialscalesofturbulenceafterhydraulicjumpoverscourholeinrectangularchannel AT kalenikmarek turbulenceintensityandspatialscalesofturbulenceafterhydraulicjumpoverscourholeinrectangularchannel |