Restoration of a boulder reef in temperate waters: Strategy, methodology and lessons learnt

作者: Josianne G. Støttrup , Karsten Dahl , Sanne Niemann , Claus Stenberg , Johnny Reker

DOI: 10.1016/J.ECOLENG.2017.02.058

关键词:

摘要: Abstract Anthropogenic impacts on marine habitats are a global problem, particularly in coastal areas. While boulder reefs temperate waters hold high biomass and biodiversity, may be unable to recover from anthropogenic stressors without restoration efforts, little is known about how restore conserve this important habitat. Limited knowledge serious impediment projects aimed at restoring that have been degraded or removed by substrate extraction. In 2008, reef was restored Kattegat, the transitional between North Sea Baltic Sea, using differently sized boulders. The covered approximately 27,600 m 2 seafloor included 100,712 tons of boulders added depths ranging 4 11 m. This paper describes methodology lessons learned during project. Before restoration, geological geotechnical surveys confirmed sea bed could support boulders, resolution bathymetric provided input for design reef, numerical modelling hydrographic sediment transport conditions. Numerical used derive conditions placements further, ensure would not affect morphology local harbour protected habitat, both situated vicinity area. Data physical structure collected 2009, demonstrated cavernous structures shallow areas were restored. Moreover, data 2012 stability reef. Finally, results highlighted importance stakeholder mapping outset, appropriate timing involvement ongoing consideration perceptions. Charting strategy introducing checklist projects, outlines considerations needed meet objectives, having undesirable effects existing morphological conditions, including nearby habitats.

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