Skimming walls (fixed or floating) - Revision history

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

2020-10-26T10:03:07Z

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

Bendikhansen at 12:05, 6 April 2020

2020-04-06T12:05:14Z

Bendikhansen at 13:33, 5 April 2020

2020-04-05T13:33:29Z

Bendikhansen: Text replacement - "m3" to "m³"

2020-02-21T10:19:17Z

Text replacement - "m3" to "m<sup>3</sup>"

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

2020-01-21T14:21:51Z

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

Bendikhansen at 14:17, 20 January 2020

2020-01-20T14:17:23Z

Bendikhansen: /* Classification table */

2019-10-28T10:42:47Z

Classification table

Bendikhansen: /* Classification table */

2019-10-28T10:42:25Z

Classification table

Bendikhansen at 11:51, 25 October 2019

2019-10-25T11:51:16Z

Bendikhansen at 11:57, 24 October 2019

2019-10-24T11:57:54Z

← Older revision		Revision as of 10:03, 26 October 2020
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	*Odeh , M und Orvis, C. 1998. Downstream Fish Passage Design Considerations and Developments at Hydroelectric Projects in the North-east USA. 1998.		*Odeh , M und Orvis, C. 1998. Downstream Fish Passage Design Considerations and Developments at Hydroelectric Projects in the North-east USA. 1998.

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

@@ Line 1: / Line 1: @@
-[[category:Downstream fish migration measures]][[category:Measures]]
+[[file:icon_downstream.png|right|150px|link=[[Downstream fish migration]]]]
 =Introduction=
 [[file:skimming_walls_bellows.png|thumb|250px|Figure 1: Skimming wall at Bellows falls power station ]]
@@ Line 23: / Line 23: @@
 =References=
 *Odeh , M und Orvis, C. 1998. Downstream Fish Passage Design Considerations and Developments at Hydroelectric Projects in the North-east USA. 1998.

@@ Line 9: / Line 9: @@
 In France, the application of skimming walls is reserved to large HPP only, where other solutions are not feasible.
 =[[Methods, tools, and devices]]=
 ==During planning==
@@ Line 18: / Line 15: @@
 The physical installations of skimming wall must be planned according to the power plant geometry and construction works must be adapted to physical forces and the hydropower scheme.
 ==During operation==
-A skimming wall doesn’t need maintenance as cannot be clogged.
+A skimming wall doesn’t need maintenance as cannot be clogged
 =Classification table=
 {{Skimming wall (fixed or floating)}}

@@ Line 5: / Line 5: @@
 Skimming walls (or surface mask) can be used to deflect those species that migrate in the surface layers, such as salmonid smolts. This device is inefficient for bottom-oriented species, such as eels. A guide wall must cover a certain depth to generate a sufficient repelling effect and must be installed at an angle to the channel intake to guide fish to a bypass entrance located at its downstream end.
-Such a device has been installed on the East Coast of the USA at the Bellow Falls power station (Connecticut River, maximum turbine discharge 410 m3/s). The wall extends vertically halfway down the 9 m deep water column, at an angle of 40° across the channel and guides fish towards a sluice gate and a channel leading to the tailrace. An auxiliary bypass located near the bar rack is intended to accommodate fish which have passed under the wall. The efficiency of the guide wall was estimated at 84%, with 10% of the smolts passing through the secondary bypass and 6% through the turbines. The efficiency of the device is probably closely related to the angle of the wall with respect to the flow and above all to the depth (4.5 m) at which the wall is submerged (Odeh , et al., 1998).
+Such a device has been installed on the East Coast of the USA at the Bellow Falls power station (Connecticut River, maximum turbine discharge 410 m<sup>3</sup>/s). The wall extends vertically halfway down the 9 m deep water column, at an angle of 40° across the channel and guides fish towards a sluice gate and a channel leading to the tailrace. An auxiliary bypass located near the bar rack is intended to accommodate fish which have passed under the wall. The efficiency of the guide wall was estimated at 84%, with 10% of the smolts passing through the secondary bypass and 6% through the turbines. The efficiency of the device is probably closely related to the angle of the wall with respect to the flow and above all to the depth (4.5 m) at which the wall is submerged (Odeh , et al., 1998).
 In France, the application of skimming walls is reserved to large HPP only, where other solutions are not feasible.

@@ Line 10: / Line 10: @@
 =[[Methods, tools, and devices]]=
-=Useful MTDs=
+=Relevant MTDs and test cases=
 {{Suitable MTDs for Skimming walls (fixed or floating)}}

Skimming walls (fixed or floating) - Revision history

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

Bendikhansen at 12:05, 6 April 2020

Bendikhansen at 13:33, 5 April 2020

Bendikhansen: Text replacement - "m3" to "m3"

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

Bendikhansen at 14:17, 20 January 2020

Bendikhansen: /* Classification table */

Bendikhansen: /* Classification table */

Bendikhansen at 11:51, 25 October 2019

Bendikhansen at 11:57, 24 October 2019

Bendikhansen: Text replacement - "m3" to "m³"