Hydraulic jump on rough beds: conceptual modeling and experimental validation
The aim of this study was to assess and quantify the effect of channel bed roughness on hydraulic jumps based on sound physical theories. Assuming that integrated bed shear stress due to surface roughness changes linearly with supercritical velocity, a novel definition for the shear force coefficien...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IWA Publishing
2021-06-01
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| Series: | Water Supply |
| Subjects: | |
| Online Access: | http://ws.iwaponline.com/content/21/4/1423 |
| _version_ | 1818917191282589696 |
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| author | Umut Türker Manousos Valyrakis |
| author_facet | Umut Türker Manousos Valyrakis |
| author_sort | Umut Türker |
| collection | DOAJ |
| description | The aim of this study was to assess and quantify the effect of channel bed roughness on hydraulic jumps based on sound physical theories. Assuming that integrated bed shear stress due to surface roughness changes linearly with supercritical velocity, a novel definition for the shear force coefficient and for roller length were obtained. Experimental findings and Pearson's correlation verify that the developed equations perform reasonably well and they prove that a linear correlation assumption between integrated bed shear stress and supercritical velocity is valid for a Froude number between 1.1 and 9.8. The shear force coefficient is defined in terms of the Reynolds coefficient and the supercritical flow velocity is directly related to the modified Reynolds number. A new analytical equation for roller length as a function of the modified Reynolds number was also developed and validated by using data from the experimental study. HIGHLIGHTS
The tendency of the Reynolds coefficient to approach a fixed value increases as the modified Reynolds number increases.;
The results of this study showed that the modified Reynolds number is important in roller length analysis and cannot be ignored.;
Pearson's correlation analysis showed a significant positive linear correlation between integrated bed shear stress and upstream supercritical velocity.; |
| first_indexed | 2024-12-20T00:30:08Z |
| format | Article |
| id | doaj.art-c155c34cdff74a9da24c68da12c5ce27 |
| institution | Directory Open Access Journal |
| issn | 1606-9749 1607-0798 |
| language | English |
| last_indexed | 2024-12-20T00:30:08Z |
| publishDate | 2021-06-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Supply |
| spelling | doaj.art-c155c34cdff74a9da24c68da12c5ce272022-12-21T19:59:58ZengIWA PublishingWater Supply1606-97491607-07982021-06-012141423143710.2166/ws.2020.292292Hydraulic jump on rough beds: conceptual modeling and experimental validationUmut Türker0Manousos Valyrakis1 Civil Engineering Department, Eastern Mediterranean University, Gazimağusa, North Cyprus, Mersin 10, Turkey Infrastructure and Environment Research Division, School of Engineering, University of Glasgow, Glasgow G12 8LT, United Kingdom The aim of this study was to assess and quantify the effect of channel bed roughness on hydraulic jumps based on sound physical theories. Assuming that integrated bed shear stress due to surface roughness changes linearly with supercritical velocity, a novel definition for the shear force coefficient and for roller length were obtained. Experimental findings and Pearson's correlation verify that the developed equations perform reasonably well and they prove that a linear correlation assumption between integrated bed shear stress and supercritical velocity is valid for a Froude number between 1.1 and 9.8. The shear force coefficient is defined in terms of the Reynolds coefficient and the supercritical flow velocity is directly related to the modified Reynolds number. A new analytical equation for roller length as a function of the modified Reynolds number was also developed and validated by using data from the experimental study. HIGHLIGHTS The tendency of the Reynolds coefficient to approach a fixed value increases as the modified Reynolds number increases.; The results of this study showed that the modified Reynolds number is important in roller length analysis and cannot be ignored.; Pearson's correlation analysis showed a significant positive linear correlation between integrated bed shear stress and upstream supercritical velocity.;http://ws.iwaponline.com/content/21/4/1423bed roughnesshydraulic jumpmodified reynolds numberroller lengthshear force coefficient |
| spellingShingle | Umut Türker Manousos Valyrakis Hydraulic jump on rough beds: conceptual modeling and experimental validation Water Supply bed roughness hydraulic jump modified reynolds number roller length shear force coefficient |
| title | Hydraulic jump on rough beds: conceptual modeling and experimental validation |
| title_full | Hydraulic jump on rough beds: conceptual modeling and experimental validation |
| title_fullStr | Hydraulic jump on rough beds: conceptual modeling and experimental validation |
| title_full_unstemmed | Hydraulic jump on rough beds: conceptual modeling and experimental validation |
| title_short | Hydraulic jump on rough beds: conceptual modeling and experimental validation |
| title_sort | hydraulic jump on rough beds conceptual modeling and experimental validation |
| topic | bed roughness hydraulic jump modified reynolds number roller length shear force coefficient |
| url | http://ws.iwaponline.com/content/21/4/1423 |
| work_keys_str_mv | AT umutturker hydraulicjumponroughbedsconceptualmodelingandexperimentalvalidation AT manousosvalyrakis hydraulicjumponroughbedsconceptualmodelingandexperimentalvalidation |