Dam Removal on the Sélune River: the Scientific program · biocenosis Landscape ecology Human...
Transcript of Dam Removal on the Sélune River: the Scientific program · biocenosis Landscape ecology Human...
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Ecology & Ecosystem health lab UMR 0985 INRA-Agrocampus Ouest, RENNES (FRANCE)
Dam Removal on the Sélune River: the Scientific program
Stéphane Fraisse, Jean Luc Baglinière & Jean-Marc Roussel
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1- Biological fluxes
Diadromous Species on the Sélune River : Atlantic salmon European Eel Sea Trout River Lamprey Sea Lamprey Allis Shad Twait Shad
The reasons for dismantling
Forget et al., 2018
% of suitable habitat accessible for salmon in the Selune Basin
23%
77%
upstream
downstream
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1993 Catastrophic emptying of the reservoirs
The reasons for dismantling
2- Sediment fluxes
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3- Water quality
Bloom of toxic Cyanobacteria on the Sélune River
The reasons for dismantling
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Bellmore et al. 2016
Increase in dam removals since the 90’s
Science and dam removals
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70% of removed dams studied: no initial state
180 articles – 137 dams removed
Science and dam removals
0
50
100
150
sans données pré-effacement avec données avec pré-effacement
Without data before removal
With data before removal
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42
19
1
13
1
9
0 29
14
3
2
0
1
0
3
high
Aquatic biocenosis
Landscape ecology Human Sciences
Hydrogeomorphology
Dams removed studied (n=137)
103
34 low
Science and dam removals
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2012-2027: a 15 years scientific program
initial state restoration
2012 2018 2027 2021
removal
-> describe processes underlying the restoration of the river and its valley after dam removal -> provide scientific knowledge for future dam removal projects
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Scientific comitee (External scientists)
Coordination group
Steering comitee (INRA, EDF, Water Agency, State,
Fishing national federation)
Scientists
2012-2027: a 15 years scientific program
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The scientific program: 3 thematic areas + 1 observatory
Sélune River Observatory
Territorial dynamics and trajectories
Fluvial dynamics and water quality
Biocenosis Functioning and Evolution