BioHaven Living Shorelines and Floating Breakwaters

BioHavens have been installed in coastal areas, ponds and lakes.  Living shorelines are intended to:

• Prevent erosion and/or reclaim land frontage, 
• Provide wildlife and spawning habitat, 
• Protect property, 
• Encourage recreation, 
• Improve water quality, 
• Enhance natural beauty and 
• Reduce restoration costs.  
  
  

Installing BioHaven living shorelines requires relatively little heavy equipment and less labor than conventional alternatives such as bulkheads and riprap.  The lightweight, modular system can be assembled and installed with minimal disruption to the environment it is designed to protect.

Bayou Sauvage National Wildlife Refuge
At the nation’s largest urban national wildlife refuge, preserving marsh habitat is critical.  Over time, low-to-moderate wave energies have eroded much of the shoreline.  The cost-effective solution chosen in August 2009 was to install 856 linear feet of BioHavens to buffer waves, increase sedimentation and grow new vegetation.  Partners were the City of New Orleans, U.S. Fish and Wildlife Service, and Bayou Land Resource Conservation & Development Council (a division of NRCS).

Catfish Lake
At Catfish Lake, part of the South Lafourche Levee District near Galiano, LA, the levee base was eroding from daily wave action.  In March 2009, 1000 linear feet of BioHavens were installed to buffer the waves, protect the levee base and provide needed vegetation.  Selected plants were marsh hay, seashore paspalum and vermillion smooth cord.  Both the BioHaven matrix and the vegetation serve as buffers between the waves and levee.
In only one year, the vegetation has spread and is providing 2-3 feet of vegetative buffer between the waves and levee base.  Sections of the project where matrix was installed without plants have shown signs of erosion, indicating that plants are necessary for this application.

Isle de Jean Charles
Significant marsh erosion has been noted on this island on a saltwater lake near Pointe Au Chene, Louisiana.  To protect the small slivers of remaining marsh from erosion, provide a buffer between the open lake and a road, provide a suitable environment to trap sediment and allow vegetation to spread, 1560 linear feet of BioHavens were installed in September 2011 and planted with smooth cord and seashore paspalum.  Results to date show:

• BioHavens are protecting the remaining marsh from shearing waves.
• Vegetation is noticeably greener than the nearby natural marsh.
• New shoots and roots are protruding from the BioHavens.
  
  

Conclusions
Three floating treatment wetland systems have been successfully deployed at brackish water and saltwater environments in Louisiana.  Living shorelines have also been installed in ponds and lakes in Shanghai, China and Singapore.  Results include erosion protection, wave mitigation and enhanced vegetation.  This cost-effective option was installed with no heavy equipment and little-to-no damage to habitat or the shorelines’ natural appearance.