1 U N I V E R S I T Y O F A A R H U S Danish Environmental Research Institute Department of Freshwater Ecology Hans Thodsen Biodiversity – Bonn – October 2008 Ecological effect documentation following re-meandering of Danish rivers: an overview Hans Thodsen, Brian Kronvang, Esben Kristensen, Jens Skriver, Peter Wiberg-Larsen and Annette Baatrup-Pedersen HATH@DMU.DK U N I V E R S I T Y O F A A R H U S Danish Environmental Research Institute Department of Freshwater Ecology Hans Thodsen Biodiversity – Bonn – October 2008 Outline 1. Dimensions and goals in river restoration? 2. River restoration in Denmark – a history of a nice sequence of Governmental Actions? 3. River re-meandering in Denmark - projects and outcomes? 4. Can we extract a new learning from 19 years of ecological effect monitoring of an active restoration (re-meandering) of the River Gelså, Denmark and an upstream passive restored reach (ceased river maintenance)? 5. WFD mapping of watercourses at risk – pressures and river types – the Pilot River Odense, Denmark. 6. A proposal for the future use of river restoration under the Water Framework Directive – Pilot River Odense case.