Case Studies of nature based solutions: Examples from Elbe and Rhine Rivers Dr. Christian Damm Paris, 25th October 2017 1
Large Scale Conservation Project Lenzener Elbtalaue 2
Elbe River, August 2002 3 3 October 17th 2017 Dr. Christian Damm
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Maßnahmenkarte Narrowing Lütkenwischer river flood channel Werder between Wustrow and Lenzen and dike relocation Böser Ort 5 5 October 17th 2017 Dr. Christian Damm
Dike relocation area near Lenzen (Situation 1998 - before dike construction) Lenzen 6 6 October 17th 2017 Dr. Christian Damm
Photo: J.Purps Dike relocation area (under construction 2007) 7 7 October 17th 2017 Dr. Christian Damm
8 Structurally poor grasslands and riverbanks in the project area
9 Natural, structurally rich riverbank vegetation near the project area
10 The The former goal: Natural farmed landscape Lenzener Elbtalaue
11 Our goal: 420 ha living floodplain
12 The historical situation: floodplain forest near Lenzen (1776)
Land consolidation scheme (2002-2011) 13 13 October 17th 2017 Dr. Christian Damm
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Dike Relocation Lenzen-Wustrow Inlet/Outlet structures (gaps) Source: BAW 2012 20 October 17th 2017 Dr. Christian Damm
Beneficial effects I: Flood peak reduction 2011 (Measurements by BAW) Flood peak levels on flooding events 2006 and 2011 Peak level-difference 2006-2011 [cm] dike relocation Gauging stations 21 October 17th 2017 Dr. Christian Damm
Flood peak reduction - June 2013 (Measurements by BAW) Vorteile Deichrückverlegung Beispiel Lenzen (Elbe), 420 ha Decrease in water level between Wittenberge and Lenzen at maximum discharge during extreme flood in 2013 (Source: Promny et al. 2014) 22 October 17th 2017 Dr. Christian Damm
Beneficial effects I: Map of measures and habitat types 23 October 17th 2017 Dr. Christian Damm
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Measures to restore a diverse, natural floodplain Reforestation Hay-Seeding Farmland -> pasture landscape Public relations 26 October 17th 2017 Dr. Christian Damm
Project costs: Technical planning: Dike construction (new dike): Dike construction (old dike): 0,8 Mio Euro 10,8 Mio. Euro 1,7 Mio. Euro Land acquisition 230.000 Euro + Land acquisition LIFE 2 Mio. Euro Conservation measures 600.000 Euro 27 October 17th 2017 Dr. Christian Damm
Proposed dike-relocation near Wittenberge City of Wittenberge 28 October 17th 2017 Dr. Christian Damm
Proposed Dike-relocation near Wittenberge City of Wittenberge 29 October 17th 2017 Dr. Christian Damm
Proposed Dike-relocation near Wittenberge City of Wittenberge 30 October 17th 2017 Dr. Christian Damm
Case study Upper Rhine From Braided River To trained channel 31 October 17th 2017 Dr. Christian Damm
Development of Rastatter Rheinaue floodplain 1816-2015 Quelle: KIT-Aueninstitut: M.Diaz 2016 02.11.2017
Rheinauen bei Rastatt Lost habitat diversity Aktive Aue Acker Wald Grünland Kiesabbau Sand-/Kiesbänke Industrie Siedlungen Kiessee Auengewässer Regulierte Flüsse Quelle Grafik: Auen-Institut: M.Diaz (verändert) 02.11.2017
A problem for flood protection and Biodiversity: Sedimentation in the floodplain Quellen: KIT-Aueninstitut 34 October 17th 2017 Dr. Christian Damm 02.11.2
New dynamics in the historical side channel system Re-opening of River-Floodplain connections Quelle: Auen-Institut: M.Diaz (verändert) 35 October 17th 2017 Dr. Christian Damm
New dynamics in the historical side channel system Options within the Rastatter Rheinaue Gewässersituation aktuell Entwicklungsszenario 36 October 17th 2017 Dr. Christian Damm
37 Merci pour votre attention!