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...

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Autores principales:	Umut Türker, Manousos Valyrakis
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	bed roughness hydraulic jump modified reynolds number roller length shear force coefficient Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/c155c34cdff74a9da24c68da12c5ce27
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spelling	oai:doaj.org-article:c155c34cdff74a9da24c68da12c5ce272021-11-06T07:14:51ZHydraulic jump on rough beds: conceptual modeling and experimental validation1606-97491607-079810.2166/ws.2020.292https://doaj.org/article/c155c34cdff74a9da24c68da12c5ce272021-06-01T00:00:00Zhttp://ws.iwaponline.com/content/21/4/1423https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798The 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.;Umut TürkerManousos ValyrakisIWA Publishingarticlebed roughnesshydraulic jumpmodified reynolds numberroller lengthshear force coefficientWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 4, Pp 1423-1437 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bed roughness hydraulic jump modified reynolds number roller length shear force coefficient Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	bed roughness hydraulic jump modified reynolds number roller length shear force coefficient Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Umut Türker Manousos Valyrakis Hydraulic jump on rough beds: conceptual modeling and experimental validation
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.;
format	article
author	Umut Türker Manousos Valyrakis
author_facet	Umut Türker Manousos Valyrakis
author_sort	Umut Türker
title	Hydraulic jump on rough beds: conceptual modeling and experimental validation
title_short	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_sort	hydraulic jump on rough beds: conceptual modeling and experimental validation
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/c155c34cdff74a9da24c68da12c5ce27
work_keys_str_mv	AT umutturker hydraulicjumponroughbedsconceptualmodelingandexperimentalvalidation AT manousosvalyrakis hydraulicjumponroughbedsconceptualmodelingandexperimentalvalidation
_version_	1718443818668261376

Hydraulic jump on rough beds: conceptual modeling and experimental validation

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