Case study:River Gelsa at Bevtoft - Revision history

Alexrrc at 16:48, 2 January 2019

2019-01-02T16:48:25Z

← Older revision		Revision as of 16:48, 2 January 2019
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	}}		}}
	{{Measures		{{Measures
	~~\|Bank and bed modifications measure=Construction of meanders,~~		\|Planform / Channel pattern=Channel naturalisation, Meandering channel, Creation of meanders,
	\|Planform / Channel pattern=Channel naturalisation, Meandering channel,
	\|Management interventions=ceased maintenance regime		\|Management interventions=ceased maintenance regime
	}}		}}

Alexrrc at 16:42, 2 January 2019

2019-01-02T16:42:10Z

← Older revision		Revision as of 16:42, 2 January 2019
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	{{Measures		{{Measures
	\|Bank and bed modifications measure=Construction of meanders,		\|Bank and bed modifications measure=Construction of meanders,
	\|Planform / Channel pattern=Channel naturalisation, ~~Creation of new meandering~~ channel,		\|Planform / Channel pattern=Channel naturalisation, Meandering channel,
	\|Management interventions=ceased maintenance regime		\|Management interventions=ceased maintenance regime
	}}		}}

SFW Rob at 13:17, 6 September 2013

2013-09-06T13:17:40Z

← Older revision		Revision as of 13:17, 6 September 2013
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	Nineteen years after restoration works were completed, hydromorphological conditions in the restored channel have developed in a very similar way to the unaltered channel. This supports the view that natural recovery without human intervention can be as effective as planned restoration.		Nineteen years after restoration works were completed, hydromorphological conditions in the restored channel have developed in a very similar way to the unaltered channel. This supports the view that natural recovery without human intervention can be as effective as planned restoration.
	}}		}}
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	{{Case study subcatchment		{{Case study subcatchment
	\|Subcatchment=Ribe Å		\|Subcatchment=Ribe Å
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	{{Monitoring documents}}		{{Monitoring documents}}
	{{Monitoring documents end}}		{{Monitoring documents end}}
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	\|Information=Friberg, N., Kronvang, B., Svendsen, L.M., Hanse, H.O., Nielsen, N.B. (1994). Restoration of a channelized reach of the River Gelså, Denmark: Effects on the macroinvertebrate community. Aquatic Conservation: Marine and Freshwater Ecosystems, 4 (4), 289-296.		\|Information=Friberg, N., Kronvang, B., Svendsen, L.M., Hanse, H.O., Nielsen, N.B. (1994). Restoration of a channelized reach of the River Gelså, Denmark: Effects on the macroinvertebrate community. Aquatic Conservation: Marine and Freshwater Ecosystems, 4 (4), 289-296.
	}}		}}
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InfoMan at 11:59, 3 July 2013

2013-07-03T11:59:41Z

← Older revision		Revision as of 11:59, 3 July 2013
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	\|Picture description=Courtesy of Google Street Map, 2013.		\|Picture description=Courtesy of Google Street Map, 2013.
	\|Project summary=From July to September 1989 a 1.3 km reach of the river which had historically been straightened and channelised, was restored to a 1.9 km meandering course.		\|Project summary=From July to September 1989 a 1.3 km reach of the river which had historically been straightened and channelised, was restored to a 1.9 km meandering course.
	Rip-rap structures were created in the new meanders using 1000 m{{sup\|3}} of stone. 740m{{sup\|3}} of gravels were used to create new spawning grounds.		Rip-rap structures were created in the new meanders using 1000 m<sup>3</sup> of stone. 740m<sup>3</sup> of gravels were used to create new spawning grounds.
	In total sixteen new meanders were created, transforming the in stream morphology, decreasing channel width by 3-4m and reducing discharge capacity by around 50%. Sinuosity also increased from 1.15 and 1.60. A weir structure was also demolished just upstream of the project area as part of the restoration design.		In total sixteen new meanders were created, transforming the in stream morphology, decreasing channel width by 3-4m and reducing discharge capacity by around 50%. Sinuosity also increased from 1.15 and 1.60. A weir structure was also demolished just upstream of the project area as part of the restoration design.
	A similar upstream reach was left in the original channelised state to act as a benchmark against which improvements in the restored channel could be measured. An extensive maintenance regime of dredging and mechanical weed clearance was altered to weed clearance by scythe, and later to no human intervention. This reach represents an alternative option for restoration, which relies on natural processes to take over without human intervention.		A similar upstream reach was left in the original channelised state to act as a benchmark against which improvements in the restored channel could be measured. An extensive maintenance regime of dredging and mechanical weed clearance was altered to weed clearance by scythe, and later to no human intervention. This reach represents an alternative option for restoration, which relies on natural processes to take over without human intervention.

InfoMan at 11:58, 3 July 2013

2013-07-03T11:58:29Z

← Older revision		Revision as of 11:58, 3 July 2013
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	\|Picture description=Courtesy of Google Street Map, 2013.		\|Picture description=Courtesy of Google Street Map, 2013.
	\|Project summary=From July to September 1989 a 1.3 km reach of the river which had historically been straightened and channelised, was restored to a 1.9 km meandering course.		\|Project summary=From July to September 1989 a 1.3 km reach of the river which had historically been straightened and channelised, was restored to a 1.9 km meandering course.
	Rip-rap structures were created in the new meanders using 1000 m3 of stone. ~~740m3~~ of gravels were used to create new spawning grounds.		Rip-rap structures were created in the new meanders using 1000 m{{sup\|3}} of stone. 740m{{sup\|3}} of gravels were used to create new spawning grounds.
	In total sixteen new meanders were created, transforming the in stream morphology, decreasing channel width by 3-4m and reducing discharge capacity by around 50%. Sinuosity also increased from 1.15 and 1.60. A weir structure was also demolished just upstream of the project area as part of the restoration design.		In total sixteen new meanders were created, transforming the in stream morphology, decreasing channel width by 3-4m and reducing discharge capacity by around 50%. Sinuosity also increased from 1.15 and 1.60. A weir structure was also demolished just upstream of the project area as part of the restoration design.
	A similar upstream reach was left in the original channelised state to act as a benchmark against which improvements in the restored channel could be measured. An extensive maintenance regime of dredging and mechanical weed clearance was altered to weed clearance by scythe, and later to no human intervention. This reach represents an alternative option for restoration, which relies on natural processes to take over without human intervention.		A similar upstream reach was left in the original channelised state to act as a benchmark against which improvements in the restored channel could be measured. An extensive maintenance regime of dredging and mechanical weed clearance was altered to weed clearance by scythe, and later to no human intervention. This reach represents an alternative option for restoration, which relies on natural processes to take over without human intervention.

InfoMan at 11:55, 3 July 2013

2013-07-03T11:55:09Z

← Older revision		Revision as of 11:55, 3 July 2013
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	}}		}}
	{{Measures		{{Measures
	\|Bank and bed modifications measure=Construction of meanders,		\|Bank and bed modifications measure=Construction of meanders,
	\|Planform / Channel pattern=Channel naturalisation; Creation of new meandering channel,		\|Planform / Channel pattern=Channel naturalisation, Creation of new meandering channel,
	\|Management interventions=ceased maintenance regime		\|Management interventions=ceased maintenance regime
	}}		}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

NickRRC at 10:59, 10 May 2013

2013-05-10T10:59:40Z

← Older revision		Revision as of 10:59, 10 May 2013
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	{{Case study status		{{Case study status
	\|Approval status=~~Draft~~		\|Approval status=Approved
	}}		}}
	{{Location		{{Location

NickRRC at 10:59, 10 May 2013

2013-05-10T10:59:22Z

← Older revision		Revision as of 10:59, 10 May 2013
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	\|Contact organisation=River Restoration Centre		\|Contact organisation=River Restoration Centre
	\|Multi-site=No		\|Multi-site=No
			\|Project picture=Gelsa.png
			\|Picture description=Courtesy of Google Street Map, 2013.
	\|Project summary=From July to September 1989 a 1.3 km reach of the river which had historically been straightened and channelised, was restored to a 1.9 km meandering course.		\|Project summary=From July to September 1989 a 1.3 km reach of the river which had historically been straightened and channelised, was restored to a 1.9 km meandering course.
	Rip-rap structures were created in the new meanders using 1000 m3 of stone. 740m3 of gravels were used to create new spawning grounds.		Rip-rap structures were created in the new meanders using 1000 m3 of stone. 740m3 of gravels were used to create new spawning grounds.
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	Post project monitoring was carried out in May in 1990, 1991, 1993 and 1995, as well as pre project monitoring. Results of monitoring showed nearly three times the macroinvertebrate population present post restoration. Numbers in the upstream reach which was left unaltered also increased between 1990 and 1995. Brown trout recovered to pre-restoration levels but not beyond.		Post project monitoring was carried out in May in 1990, 1991, 1993 and 1995, as well as pre project monitoring. Results of monitoring showed nearly three times the macroinvertebrate population present post restoration. Numbers in the upstream reach which was left unaltered also increased between 1990 and 1995. Brown trout recovered to pre-restoration levels but not beyond.
	The results also showed that the River Gelsa had stabilised by 1993, with changes in substrate and macroinvertebrate composition mainly taking place between 1993 and 1995. The unaltered reach also showed impressive natural recovery, indicating that the termination of maintenance practices can have a substantial effect on the stream environment. Additional of gravels would further improve the channel and could provide a very cost effective restoration strategy.		The results also showed that the River Gelsa had stabilised by 1993, with changes in substrate and macroinvertebrate composition mainly taking place between 1993 and 1995. The unaltered reach also showed impressive natural recovery, indicating that the termination of maintenance practices can have a substantial effect on the stream environment. Additional of gravels would further improve the channel and could provide a very cost effective restoration strategy.
	Nineteen years after restoration works were completed, hydromorphological conditions in the restored channel have developed in a very similar way to the unaltered channel. This supports the view that natural recovery without human intervention can be as effective as planned restoration.		Nineteen years after restoration works were completed, hydromorphological conditions in the restored channel have developed in a very similar way to the unaltered channel. This supports the view that natural recovery without human intervention can be as effective as planned restoration.

	}}		}}
	{{Case study subcatchment		{{Case study subcatchment

NickRRC at 11:12, 30 January 2013

2013-01-30T11:12:19Z

← Older revision		Revision as of 11:12, 30 January 2013
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	\|Project started=1989/07/01		\|Project started=1989/07/01
	\|Works completed=1989/09/01		\|Works completed=1989/09/01
			\|Project completed=1989/09/01
	\|Total cost category=more than 10000 k€		\|Total cost category=more than 10000 k€
	}}		}}

NickRRC at 10:01, 4 December 2012

2012-12-04T10:01:31Z

← Older revision		Revision as of 10:01, 4 December 2012
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	}}		}}
	{{Case study subcatchment}}		{{Case study subcatchment
			\|Subcatchment=Ribe Å
			}}
	{{Site		{{Site
	\|Name=Bevtoft		\|Name=Bevtoft