GIVEN GEOMORPHIC REGIME AND IMPACTS, WHAT IS REQUIRED?

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Presentation transcript:

GIVEN GEOMORPHIC REGIME AND IMPACTS, WHAT IS REQUIRED? Potential for geomorphic work Degree of impact to natural physical process GIVEN GEOMORPHIC REGIME AND IMPACTS, WHAT IS REQUIRED? ‘FUNCTIONAL DESIGN’ ‘INITIAL CONDITIONS DESIGN’ ACTIVE RESTORATION ‘ASSISTED RECOVERY’ ‘DO NOTHING’ HYTECH Symposium, Aug. 2016

Project Example (UK) – River Nairn at Aberarder IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – River Nairn at Aberarder 20th September 2017 flow IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – River Nairn at Aberarder IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – River Nairn at Aberarder 9th Oct. 20th Sept. 20th Sept. POT TAIL 9th Oct. flow IFM ‘The Big Fish’, Oct. 2017

ECOLOGICAL BENEFITS OF WETLANDS Refugia from high flows and cover from predators – access back to main channel important Potentially important in controlling water temperatures Maintaining river baseflows in the summer Management/ storage of fine sediment Rearing habitat? (high food supply/ low energy expenditure) 2. Potentially overwintering habitat? IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – River Nairn at Aberarder ~28,200m2 of online wetland habitat created flow flow Approximate extents of wetland/ pond areas areas. IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – River Nairn at Aberarder flow IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – River Nairn at Aberarder flow IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – River Nairn at Aberarder flow Baseline data available for fish populations and post-implementation monitoring planned. Monitoring underway – post-construction physical resurveys already begun and plan to be conducted periodically. IFM ‘The Big Fish’, Oct. 2017

Allt Lorgy: Restoration Plan Main tool: large wood and rootwad placements. Removal of boulder armour Removal of embankments Gravel augmentation

Comparison of old and new channels (4 years apart) Aerial image mosaic of post-restoration channel Pre-restoration channel

Allt Lorgy 2D hydraulic model Focus in on an area where the restoration (with large wood) has increased hydraulic complexity Detailed topographic survey and 2D hydraulic models pre and post-restoration. Redd surveys.

Project Example (UK) – Allt Lorgy 2012 2014 IFM ‘The Big Fish’, Oct. 2017

Project Example (UK) – Allt Lorgy 2011 (pre-design) 2014 MODELLED SPAWNING HABITAT Pre-design to post-flood REDDS REDD 14 redds in 2016! IFM ‘The Big Fish’, Oct. 2017

Acknowledgements HYTECH Symposium, Aug. 2016