Towards an integrated and cooperative management of fine sediment fluxes in a large trans-boundary basin: the case of Upper Rhône River
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1 SedNet Conference Krakow Solving societal challenges Poland September 2015 Working with sediments Towards an integrated and cooperative management of fine sediment fluxes in a large trans-boundary basin: the case of Upper Rhône River Christophe PETEUIL and Sylvain REYNAUD (CNR, France) Seydina DIOUF (SIG, Switzerland)
2 Content Introduction Geographic context Strategies previously applied Historical evolution of flushing impacts Recent considerations Conclusion 2
3 Why sediment management is an essential issue? Ecological health of rivers Source of data: EPFL newsletter 2009 Soil fertilization Nutrient, habitat and spawning area for the aquatic fauna Shoreline & riverbed stability 3
4 Context 4
5 Context 5
6 Context Génissiat dam (CNR) 6
7 Sediment management in Swiss reservoirs until 2012 Verbois dam (SIG) 7
8 Sediment management in Génissiat reservoir until 2012 Concentration (g/l) Discharge (m 3 /s) Discharge (m 3 /s) Water level (m) Water level (m) 8
9 Génissiat dam features Génissiat dam includes 3 hydraulic outlets located at 3 different elevations 9
10 Génissiat dam features Bottom gate: intake elevation at m 10
11 Génissiat dam features Low Level Outlet: intake elevation at m 11
12 Génissiat dam features Surface spillway: intake elevation at m 12
13 Eco-friendly flushing principle 13
14 Historical perspective of damages induced by flushing on aquatic life High Medium Low Before 1948 Lyon Rhône River Chancy-Pougny dam (1926) Geneva Geneva Lake Verbois dam (1942) FRANCE SWITZERLAND 14
15 Historical perspective of damages induced by flushing on aquatic life High Medium Low Lyon Rhône River Chancy-Pougny dam (1926) Geneva Geneva Lake Seyssel & Génissiat dams ( ) Verbois dam (1942) FRANCE SWITZERLAND 15
16 Historical perspective of damages induced by flushing on aquatic life High Medium Low 1978 Lyon Rhône River Chancy-Pougny dam (1926) Geneva Geneva Lake Seyssel & Génissiat dams ( ) Verbois dam (1942) FRANCE SWITZERLAND 16
17 Historical perspective of damages induced by flushing on aquatic life High Medium Low Lyon Rhône River Chancy-Pougny dam (1926) Geneva Geneva Lake Villebois, Champagneux, Lavours & Motz dams ( ) Seyssel & Génissiat dams ( ) Verbois dam (1942) FRANCE SWITZERLAND 17
18 Historical perspective of damages induced by flushing on aquatic life High Medium Low So from now, WHY not managing the Upper Rhône River as a whole and from a consistent manner? Lyon Rhône River Chancy-Pougny dam (1926) Geneva Geneva Lake Villebois, Champagneux, Lavours & Motz dams ( ) Seyssel & Génissiat dams ( ) Verbois dam (1942) FRANCE SWITZERLAND 18
19 Toward a consistent and integrated management of sediments fluxes Constitution of a technical work group: Composition: regulation authorities and dam operators from France and Switzerland Scope: identify, evaluate and compare all credible scenarios regarding sediment fluxes management Consultation meetings with local stakeholders 19
20 Main strategies compared 1. Passive management of reservoirs 2. Routing of Arve River sediment-laden flows by: a) Partial drawdown of all reservoirs b) Supplying an extra discharge from Lake Geneva and by a slight reservoirs drawdown 3. Sediment flushing of reservoirs: a) With complete drawdown every 3, 5 or 10 years b) According to Eco-Friendly Flushing principle every 1, 2 or 3 years 4. Dredging of deposits accumulated in reservoirs 5. Combination of scenarios 2b, 3b and 4 20
21 Scenarios evaluation Feasibility, efficiency, impact, cost and constrains of scenarios have been evaluated and compared by considering following factors: Technical Economic Environmental Legislative Societal 21
22 Scenario finally favored 1. Passive management of reservoirs 2. Routing of Arve River sediment-laden flows by: a) Supplying an extra discharge from Lake Geneva and by a slight drawdown of reservoirs b) Partial drawdown of all reservoirs 3. Sediment flushing of reservoirs: a) According to Eco-Friendly Flushing principle every 1, 2 or 3 years b) With complete drawdown every 3, 5 or 10 years 4. Dredging of deposits accumulated in reservoirs 5. Combination of scenarios 2a, 3a and 4 22
23 Conclusion Managing from a consistent and cooperative manner sediment issues in a trans-boundary basin is often a challenging but not impossible task Sediment management never relies on a unique and universal solution Multi-criteria analysis and stakeholders involvement are strong requirements to achieve a successful integrated management Eco-friendly flushing contributes to ensuring sediment continuity in reservoirs with acceptable impacts on river users and eco-systems To apply such strategy, field experiments and specific 23 dam design and operation are required
24 SedNet Conference Krakow Solving societal challenges Poland September 2015 Working with sediments Dziękuję za uwagę Thank you for your attention Merci pour votre attention
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