Case study:Afon Merin Natural Process Restoration - Revision history

TristanHe at 09:41, 23 March 2023

2023-03-23T09:41:55Z

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TristanHe at 09:20, 23 March 2023

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Ascarr at 13:00, 26 August 2021

2021-08-26T13:00:45Z

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	{{Case study status		{{Case study status
	\|Approval status=~~Draft~~		\|Approval status=Approved
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	{{Location		{{Location

Ascarr at 13:00, 26 August 2021

2021-08-26T13:00:28Z

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	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures
			\|Bank and bed modifications measure=15 leaky dams and scrapes.
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	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}
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Ascarr at 12:59, 26 August 2021

2021-08-26T12:59:31Z

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	{{Additional links and references footer}}		{{Additional links and references footer}}
	{{Supplementary Information}}		{{Supplementary Information
			\|Information=Historical maps showed a more dynamic river system prior to agriculture, conifer afforestation and land drainage in the catchment. The river had cut down into its bed, severing it from its floodplain on all but extreme events. Gravels had been scoured out of large areas of the watercourse leaving a cobble substrate sub-optimal for spawning salmonids. Significant lengths of the river were also dry during the extended dry spell in summer of 2018. The project commenced in early 2018 with felling of conifer, ditch blocking and instream structures to wet up the site and re-link the river to the floodplain and then the installation of 15 leaky dams and scrapes.
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Ascarr at 12:58, 26 August 2021

2021-08-26T12:58:47Z

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	{{Site}}		{{Site}}
	{{Project background		{{Project background
			\|Reach length directly affected=3,000
			\|Project started=2018/02/01
	\|Total cost category=10 - 50 k€		\|Total cost category=10 - 50 k€
	\|Total1 cost=30,000		\|Total1 cost=30,000

Ascarr at 12:57, 26 August 2021

2021-08-26T12:57:17Z

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	{{Project overview		{{Project overview
	\|Status=~~In progress~~		\|Status=Complete
	\|Project web site url=westwalesriverstrust.org/the-human-beaver/		\|Project web site url=westwalesriverstrust.org/the-human-beaver/
	\|Themes=Environmental flows and water resources, Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - forestry, Monitoring, Water quality		\|Themes=Environmental flows and water resources, Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - forestry, Monitoring, Water quality
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	\|Project picture=Merin1.jpg		\|Project picture=Merin1.jpg
	\|Picture description=Generic site pic		\|Picture description=Generic site pic
	\|Project summary=The site offered the potential to undertake a pilot study of low cost high nature value interventions on Welsh Government Woodland Estate. While seemingly in a natural state, the rivers was incised and disconnected from the wider flood plain, with a lack of suitable gravels for the resident native Brown Trout population. Felling commenced in 2018 and some of the timber was used to begin ditch blocking and creating leaky dams within the main channel. Early observations showed that the results had been positive with the hydrological systems soon renaturalising within the valley floor, wet areas were developing and the main channel began to take on a more braided characteristic by occupying historic channels. In channel flow diversity increased markedly allowing a more complex sediment matrix to appear.		\|Project summary=The Afon Merin is one of the principal tributaries of the Rheidol system, flowing from its upland SSSI catchment, through NRW managed Welsh Government estate Myherin woodland and onwards into the Rheidol Valley. A 3km section provided landscape scale intervention opportunities to "kick-start" natural processes to benefit biodiversity, water quality and quantity, and carbon sequestration.
	\|Monitoring surveys and results=Prework aerial studies of the area and fixed point photography at key areas through the valley have allowed a gross study of early geomorphological changes within the system, including stream number and width, and changes within the network of wet areas across the valley floor.
			The site offered the potential to undertake a pilot study of low cost high nature value interventions on Welsh Government Woodland Estate. While seemingly in a natural state, the rivers was incised and disconnected from the wider flood plain, with a lack of suitable gravels for the resident native Brown Trout population. Felling commenced in 2018 and some of the timber was used to begin ditch blocking and creating leaky dams within the main channel. Early observations showed that the results had been positive with the hydrological systems soon renaturalising within the valley floor, wet areas were developing and the main channel began to take on a more braided characteristic by occupying historic channels. In channel flow diversity increased markedly allowing a more complex sediment matrix to appear.
			\|Monitoring surveys and results=Water immediately started to spill out of bank picking up a network of relict channels within the floodplain. Subsequent high flow events have seen gravel depositing instream and as shoals, more dynamic flow patterns and a complex of side channels, permanent and temporary pond features.

			Prework aerial studies of the area and fixed point photography at key areas through the valley have allowed a gross study of early geomorphological changes within the system, including stream number and width, and changes within the network of wet areas across the valley floor.

	Aberystwyth University are undertaking flow measurements and will continue to do so over an extended time period. Ecological studies will be undertaken across this and a control site on the same water body to monitor changes.		Aberystwyth University are undertaking flow measurements and will continue to do so over an extended time period. Ecological studies will be undertaken across this and a control site on the same water body to monitor changes.

Ascarr at 12:54, 26 August 2021

2021-08-26T12:54:32Z

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	{{Site}}		{{Site}}
	{{Project background}}		{{Project background
			\|Total cost category=10 - 50 k€
			\|Total1 cost=30,000
			\|Supplementary funding information=Total project cost including felling and installation of dams and scrapes was approximately £30,000
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

Ascarr at 12:52, 26 August 2021

2021-08-26T12:52:54Z

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			{{Additional links and references
			\|Link=youtu.be/9T55beo_efc
			\|Description=UK riverprize finalist video
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	{{Additional links and references footer}}		{{Additional links and references footer}}
	{{Supplementary Information}}		{{Supplementary Information}}
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Ascarr at 12:52, 26 August 2021

2021-08-26T12:52:01Z

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	{{Monitoring documents end}}		{{Monitoring documents end}}
	{{Additional Documents}}		{{Additional Documents}}
	~~{{Case study documents~~
	\|File name=<iframe width="300" height="200" src="https://www.youtube.com/embed/9T55beo_efc" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
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