Baffle fishways - Revision history

Bendikhansen: Text replacement - "category:Measures" to "category:Solutions"

2020-10-26T10:03:05Z

Text replacement - "category:Measures" to "category:Solutions"

Bendikhansen: /* Relevant Literature */

2020-09-30T19:42:32Z

Relevant Literature

Bendikhansen at 12:58, 30 September 2020

2020-09-30T12:58:10Z

Jsanz at 08:34, 2 May 2020

2020-05-02T08:34:22Z

Jsanz at 08:22, 2 May 2020

2020-05-02T08:22:04Z

Bendikhansen at 12:09, 6 April 2020

2020-04-06T12:09:35Z

Bendikhansen: /* Relevant Literature */

2020-03-12T13:35:00Z

Relevant Literature

Hanywafa at 13:52, 11 March 2020

2020-03-11T13:52:02Z

Bendikhansen: Text replacement - "=Useful MTDs=" to "=Relevant MTDs and test cases="

2020-01-21T14:21:37Z

Text replacement - "=Useful MTDs=" to "=Relevant MTDs and test cases="

Bendikhansen: /* Classification table */

2020-01-20T13:17:40Z

Classification table

← Older revision		Revision as of 10:03, 26 October 2020
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	*Armstrong, G., Aprahamian, M., Fewings, G., Gough, P., Reader, N. and Varallo, P. (2010). Environment agency fish pass manual. Environment Agency, Bristol, UK.		*Armstrong, G., Aprahamian, M., Fewings, G., Gough, P., Reader, N. and Varallo, P. (2010). Environment agency fish pass manual. Environment Agency, Bristol, UK.

−	[[category:Upstream fish migration measures]][[category:~~Measures~~]]	+	[[category:Upstream fish migration measures]][[category:Solutions]]

← Older revision		Revision as of 19:42, 30 September 2020
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	=Relevant Literature=		=Relevant Literature=
		+	*AG-FAH. 2011. Grundlagen für einen österreichischen Leitfaden zum Bau von Fischaufstiegshilfen (FAHs). Bundesministerium für Land- und Forstwirtschaft, Umwelt und Wasserwirtschaft, Wien. 87 pp
		+	*DWA - Deutsche Vereinigung für Wasserwirtschaft, Abwasser und Abfall. 2014. Merkblatt M-509: Fischaufstiegsanlagen und fischpassierbare Bauwerke ‒Gestaltung, Bemessung, Qualitätssicherung. Hennef, 334 pp.
		+	*Armstrong, G., Aprahamian, M., Fewings, G., Gough, P., Reader, N. and Varallo, P. (2010). Environment agency fish pass manual. Environment Agency, Bristol, UK.

	[[category:Upstream fish migration measures]][[category:Measures]]		[[category:Upstream fish migration measures]][[category:Measures]]

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 [[file:icon_upstream.png|right|150px|link=[[Upstream fish migration]]]]
 =Introduction=
 Baffle fishways, including Denil, passes is also referred to as countercurrent fishways since it consists of special deflectors that lead to helical countercurrent currents, high energy conversion and reduced water velocities in the main pass . Fish species with high swimming capacity can swim right up in the water stream and a baffle fishway can be constructed relatively steep for salmon (gradient 0.2-0.25). However, the remaining current conditions are still turbulent and often water velocities are above 2 m/s. It has been shown that baffle fishways are unsuitable for most fish species and juvenile fish, including all carp fish, eels, white fish and grayling (DWA 2014). AG-FAH (2011) indicates that baffle fishways have not proven to work in practice. Armstrong (2010) writes that specially designed low gradient Denil fishways can work for several species, but they require certain hydraulic ramifications and are therefore not suitable for varying water discharges (Armstrong et al., 2010). The baffle fishway can be used at particularly steep fishway sites and may be suitable for adult salmon and trout for limited space and steep terrain. However, in most cases, other fishway types should be chosen.

← Older revision		Revision as of 08:34, 2 May 2020
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	[[file:nature_likeshway_gunz_square.jpg\|thumb\|250px\|Figure 1: ]]		[[file:nature_likeshway_gunz_square.jpg\|thumb\|250px\|Figure 1: ]]

−	Baffle fishways, including Denil, passes is also referred to ''as countercurrent fishways since it consists of special deflectors that lead to helical countercurrent currents~~'' IMPROVE~~, high energy conversion and reduced water velocities in the main pass ~~'''(1)'''~~. Fish species with high swimming capacity can swim right up in the water stream and a baffle fishway can be constructed relatively steep for salmon (gradient 0.2-0.25 ~~""m/m units or 20-25%""~~). However, the remaining current conditions are still turbulent and often water velocities are above 2 m/s. It has been shown that baffle fishways are unsuitable~~??? '''(2)'''~~ for most fish species and juvenile fish, including all carp fish, eels, white fish and grayling (DWA 2014). AG-FAH (2011) indicates that baffle fishways have not proven to work in practice. Armstrong (2010) writes that specially designed low gradient Denil fishways can work for several species, but they require certain hydraulic ramifications~~????~~ and are therefore not suitable for varying water discharges (Armstrong et al., 2010). The baffle fishway can be used at particularly steep fishway sites and may be suitable for adult salmon and trout for limited space and steep terrain. However, in most cases, other fishway types should be chosen.	+	Baffle fishways, including Denil, passes is also referred to as countercurrent fishways since it consists of special deflectors that lead to helical countercurrent currents, high energy conversion and reduced water velocities in the main pass . Fish species with high swimming capacity can swim right up in the water stream and a baffle fishway can be constructed relatively steep for salmon (gradient 0.2-0.25). However, the remaining current conditions are still turbulent and often water velocities are above 2 m/s. It has been shown that baffle fishways are unsuitable for most fish species and juvenile fish, including all carp fish, eels, white fish and grayling (DWA 2014). AG-FAH (2011) indicates that baffle fishways have not proven to work in practice. Armstrong (2010) writes that specially designed low gradient Denil fishways can work for several species, but they require certain hydraulic ramifications and are therefore not suitable for varying water discharges (Armstrong et al., 2010). The baffle fishway can be used at particularly steep fishway sites and may be suitable for adult salmon and trout for limited space and steep terrain. However, in most cases, other fishway types should be chosen.
−
−	1) The principle aim of baffle fishways is to reduce the mean velocity of the flow by placing a series of baffles on the floor and/or walls of a straight channel, which has a rectangular cross-section and a relatively steep slope. These baffles, in shapes of varying complexity, cause secondary helical currents to form which ensure an extremely efficient dissipation of energy in the flow through intense transfer of the momentum (Larinier et al., 2002)
−
−	~~2) This type of fishways can also be used for non-salmonid fish by reducing the slope to 10 % (0.1 m/m) (Bunt et al., 2001; Mallen-Cooper et al., 2007)~~.

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 [[file:nature_likeshway_gunz_square.jpg|thumb|250px|Figure 1: ]]
-Baffle fishways, including Denil passes is also referred to as countercurrent fishways since it consists of special deflectors that lead to helical countercurrent currents, high energy conversion and reduced water velocities in the main stream. Fish species with high swimming capacity can swim right up in the water stream and a baffle fishway can be constructed relatively steep for salmon (gradient 0.2-0.25). However, the remaining current conditions are still turbulent and often water velocities are above 2 m/s. It has been shown that baffle fishways are unsuitable for most fish species and juvenile fish, including all carp fish, eels, white fish and grayling (DWA 2014). AG-FAH (2011) indicates that baffle fishways have not proven to work in practice. Armstrong (2010) writes that specially designed low gradient Denil fishways can work for several species, but they require certain hydraulic ramifications and are therefore not suitable for varying water discharges (Armstrong et al., 2010). The baffle fishway can be used at particularly steep fishway sites and may be suitable for adult salmon and trout for limited space and steep terrain. However, in most cases, other fishway types should be chosen.
+Baffle fishways, including Denil, passes is also referred to ''as countercurrent fishways since it consists of special deflectors that lead to helical countercurrent currents'' IMPROVE, high energy conversion and reduced water velocities in the main pass '''(1)'''. Fish species with high swimming capacity can swim right up in the water stream and a baffle fishway can be constructed relatively steep for salmon (gradient 0.2-0.25 ""m/m units or 20-25%""). However, the remaining current conditions are still turbulent and often water velocities are above 2 m/s. It has been shown that baffle fishways are unsuitable??? '''(2)''' for most fish species and juvenile fish, including all carp fish, eels, white fish and grayling (DWA 2014). AG-FAH (2011) indicates that baffle fishways have not proven to work in practice. Armstrong (2010) writes that specially designed low gradient Denil fishways can work for several species, but they require certain hydraulic ramifications???? and are therefore not suitable for varying water discharges (Armstrong et al., 2010). The baffle fishway can be used at particularly steep fishway sites and may be suitable for adult salmon and trout for limited space and steep terrain. However, in most cases, other fishway types should be chosen.
 =[[Methods, tools, and devices]]=
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 ==During implementation==
-Physical implementation of pool-type fishways requires heavy machinery suited for the river size and its surrounding terrain, such as excavators and lorries. Work with explosives is relevant in most cases and blasted rocks and transportation of material out from the site is common. Surplus rocks should not be disposed at site because of pollution risk. The construction phase includes construction of concrete formwork, casting of concrete and iron reinforcement work.
+Physical implementation of bafle fishways requires heavy machinery suited for the river size and its surrounding terrain, such as excavators and lorries. Work with explosives is relevant in most cases and blasted rocks and transportation of material out from the site is common. Surplus rocks should not be disposed at site because of pollution risk. The construction phase includes construction of concrete formwork, casting of concrete and iron reinforcement work.
 ==During operation==

← Older revision		Revision as of 12:09, 6 April 2020
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		+	[[file:icon_upstream.png\|right\|150px\|link=[[Upstream fish migration]]]]
	=Introduction=		=Introduction=
	[[file:nature_likeshway_gunz_square.jpg\|thumb\|250px\|Figure 1: ]]		[[file:nature_likeshway_gunz_square.jpg\|thumb\|250px\|Figure 1: ]]

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 {{Baffle fishways}}
-==Relevant Literature==
+=Relevant Literature=
 [[category:Upstream fish migration measures]][[category:Measures]]

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 Injuries on baffle fishways from physical wear must be monitored and repaired in order to secure regular fish migration. Maintenance work normally require hand-tools more than heavy equipment but casting of concrete is typical. Depending of the site, removal of sediment, branches, logs and floating debris in pools and fishway entrance is common.  Monitoring systems require regular inspection, depending on product and system.
-=Useful MTDs=
+=Relevant MTDs and test cases=
 {{Suitable MTDs for Baffle fishways}}
 =Classification table=