Effects of weir geometry on scour development in the downstream of Piano Key Weirs

Scouring in the downstream of all weirs, including Piano Key Weirs (PKWs), can have major safety implications. Since the research on downstream scouring of PKWs is very limited, and the weir geometry is also known to have an impact on downstream scouring, this study investigated scouring in the down...

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Autores principales:	Alireza Mosalman Yazdi, S. Abbas Hoseini, Sohrab Nazari, Nosratollah Amanian
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	piano key weir scour trapezoidal model weir geometry 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/f40795a6feea4514890acab898812a4b
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id	oai:doaj.org-article:f40795a6feea4514890acab898812a4b
record_format	dspace
spelling	oai:doaj.org-article:f40795a6feea4514890acab898812a4b2021-11-06T07:05:48ZEffects of weir geometry on scour development in the downstream of Piano Key Weirs1606-97491607-079810.2166/ws.2020.272https://doaj.org/article/f40795a6feea4514890acab898812a4b2021-02-01T00:00:00Zhttp://ws.iwaponline.com/content/21/1/289https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Scouring in the downstream of all weirs, including Piano Key Weirs (PKWs), can have major safety implications. Since the research on downstream scouring of PKWs is very limited, and the weir geometry is also known to have an impact on downstream scouring, this study investigated scouring in the downstream of PKWs with rectangular and trapezoidal geometries and two different heights. The scour hole measurements showed that in both rectangular and trapezoidal models, scour hole parameters increased both with the increase in discharge rate and the increase in weir height. Under similar discharge conditions, the scour depth downstream from the rectangular model was greater than that downstream from the trapezoidal model. The dimensionless maximum scour depth, the distance of maximum scour depth from the weir toe, and the scour hole length for the trapezoidal PKW were, on average, 6, 13, and 11% lower than the corresponding ones for the rectangular PKW, respectively. However, these differences decreased with the increase in falling height. For both weir geometries, the maximum scour depth was aligned with the outlet keys. In addition, the maximum scour depth under the outlet keys was 13% greater than the one under the inlet keys.Alireza Mosalman YazdiS. Abbas HoseiniSohrab NazariNosratollah AmanianIWA Publishingarticlepiano key weirscourtrapezoidal modelweir geometryWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 1, Pp 289-298 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	piano key weir scour trapezoidal model weir geometry Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	piano key weir scour trapezoidal model weir geometry Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Alireza Mosalman Yazdi S. Abbas Hoseini Sohrab Nazari Nosratollah Amanian Effects of weir geometry on scour development in the downstream of Piano Key Weirs
description	Scouring in the downstream of all weirs, including Piano Key Weirs (PKWs), can have major safety implications. Since the research on downstream scouring of PKWs is very limited, and the weir geometry is also known to have an impact on downstream scouring, this study investigated scouring in the downstream of PKWs with rectangular and trapezoidal geometries and two different heights. The scour hole measurements showed that in both rectangular and trapezoidal models, scour hole parameters increased both with the increase in discharge rate and the increase in weir height. Under similar discharge conditions, the scour depth downstream from the rectangular model was greater than that downstream from the trapezoidal model. The dimensionless maximum scour depth, the distance of maximum scour depth from the weir toe, and the scour hole length for the trapezoidal PKW were, on average, 6, 13, and 11% lower than the corresponding ones for the rectangular PKW, respectively. However, these differences decreased with the increase in falling height. For both weir geometries, the maximum scour depth was aligned with the outlet keys. In addition, the maximum scour depth under the outlet keys was 13% greater than the one under the inlet keys.
format	article
author	Alireza Mosalman Yazdi S. Abbas Hoseini Sohrab Nazari Nosratollah Amanian
author_facet	Alireza Mosalman Yazdi S. Abbas Hoseini Sohrab Nazari Nosratollah Amanian
author_sort	Alireza Mosalman Yazdi
title	Effects of weir geometry on scour development in the downstream of Piano Key Weirs
title_short	Effects of weir geometry on scour development in the downstream of Piano Key Weirs
title_full	Effects of weir geometry on scour development in the downstream of Piano Key Weirs
title_fullStr	Effects of weir geometry on scour development in the downstream of Piano Key Weirs
title_full_unstemmed	Effects of weir geometry on scour development in the downstream of Piano Key Weirs
title_sort	effects of weir geometry on scour development in the downstream of piano key weirs
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/f40795a6feea4514890acab898812a4b
work_keys_str_mv	AT alirezamosalmanyazdi effectsofweirgeometryonscourdevelopmentinthedownstreamofpianokeyweirs AT sabbashoseini effectsofweirgeometryonscourdevelopmentinthedownstreamofpianokeyweirs AT sohrabnazari effectsofweirgeometryonscourdevelopmentinthedownstreamofpianokeyweirs AT nosratollahamanian effectsofweirgeometryonscourdevelopmentinthedownstreamofpianokeyweirs
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Effects of weir geometry on scour development in the downstream of Piano Key Weirs

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