preventing biological and physical river deterioration through initiative “place a stone in a...
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Preventing Biological and Physical River Deterioration through Initiative “Place a Stone
in a Stream” (GP8), Latvia
Andris Urtans,
Nature Conservation Agency, Latvia
Dublin, June 15.2011.
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General Information
• Area of Latvia 64 00 sq.km• 12.4 thousand watercourses
and 2000 lakes• Water (lakes &rivers) covers
about 2,4% of Latvia• Total length of rivers about • 37 500km• 777 streams longer than 10 km• About 30% of total stream
length are meliorated (Deepened, straigthened etc)
• 17 rivers longer than 100 km• 2 rivers longer than 300 km• Population about 2 mln,
Beavers 100.000
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General information
•
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-Eutrophication
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Cease of Human activities added with misunderstanding of coastal belt functionality
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Coastal belt on former agricultural area abandoned for fifty years. Break of short life Alnus incana stands. Tunnelled river stretches
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Increase of forest felling in the catchment promoting sedimentation and erosion. Beavers. Cease of management activities.
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Sedimentation
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Initiative “Place a Stone in a Stream”
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Stone Phenomenon
• Stone surface covered with “biofilm” acting as wastewater treatment unit
• Stones as an mechanical aerators (especially during summer periods with low natural oxygen saturation)
• Stones as a diverse microhabitats
• Possible/innovative Climate Change mitigation tool.
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5 – 10 sq.m riffle area transforms wastes generated by one person
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Covered by erosional sediment stone surfaces becomes inactive. (L.Engeles foto)
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Latvian rivers becomes silent.
Listen :Living river feature – You can hear it !!!
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A single fallen tree can become an obstacle
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.rocketing erosion and destroying productive habitats
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Another scale. Where the river has disappeared?
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Salacgriva fishermen Club in Vitrupe, 2010.g.october
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Result
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Phosphorus and human neglection
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Volunteers at work. One day later
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Sun, good company and visible result
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Sometimes blisters appears
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Low cost, locally motivating, visible result
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Everybody can do and see result
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Initiative Leaflet produced on how to install stones
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Introducing the Initiative to the President of Latvia Dr.V.Zatlers 30.05.2010.
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Many enjoy final result. Visibility. Initiative is supported by UNESCO Latvian National Commission