Shoreline Management Model v. 5 · Living shoreline practices are the preferred alternatives where...
Transcript of Shoreline Management Model v. 5 · Living shoreline practices are the preferred alternatives where...
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Coastal Resilience Project Updates
Shoreline Management Model v. 5
Christine TomblesonCCRM Tidal Wetlands Workshop
May 2, 2019
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Comprehensive Coastal ShorelineManagement Portals (CCRMPs)
• A Portal is a specially designed website that serves as the single point of access for a variety of information
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Comprehensive Coastal ShorelineManagement Portals (CCRMPs)
• Provide Information, data, and tools to assist localities
• Implementation of tidal shoreline laws and policy established by the Virginia General Assembly
www.vims.edu/ccrm/ccrmp
• Every Tidewater locality has their own specific portal
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Comprehensive Coastal ShorelineManagement Portals (CCRMPs)
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Comprehensive Coastal ShorelineManagement Portals (CCRMPs)
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Comprehensive Coastal ShorelineManagement Portals (CCRMPs)
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Comprehensive Map Viewer
BMP = Best Management Practice
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Comprehensive Map Viewer• Preferred Shoreline BMPs
Recommendations reflect Commonwealth’s policy: Living shoreline practices are the preferred
alternatives where possible.
• Recommendations intended to address eroding/failing shorelines
• Control erosion• Have ecological benefits• Contribute to coastal resiliency
• Based on available shoreline conditions
• Preferred shoreline erosion control practices/approaches
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Shoreline Management Model
• Spatial, GIS based model (Data is mapped)• Static model (Snap-shot in time)
• Determines the appropriate BMP for an eroding/failing shoreline
• Based on the available shoreline condition data at the time of inventory
• Uses decision tree logic
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Shoreline Management Model – Decision Tree Logic
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Shoreline Management Model – Decision Tree LogicStart
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Shoreline Management Model – Decision Tree Logic
Preferred BMP
Start
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Shoreline Management Model (v.5)Shoreline conditions factored into the model include:
• Bank height
• Nearshore bathymetry – Water depth
• Proximity of upland development
• Presence or absence of natural buffers (tidal marshes, beaches, riparian forests)
• Wave exposure (fetch) - Energy
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Shoreline Management Model (v.5 )
What’s New?
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Shoreline Management Model (v.5)1) Model now factors in existing shoreline defense structures
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Shoreline Management Model (v.5)2) Preferred BMP Recommendation (slight) Changes
Previous Recommendations• Maintain/Enhance/Create Marsh
and/or Riparian Buffer• Plant Marsh with Sill• Groin Field with Beach Nourishment• Maintain Beach or Offshore
Breakwater with Beach Nourishment• Revetment
New Recommendations• Non-Structural Living Shoreline• Plant Marsh with Sill• Groin Field with Beach Nourishment• Maintain Beach or Offshore
Breakwater with Beach Nourishment• Revetment• Bulkhead Toe Revetment
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Shoreline Management Model (v.5)2) Preferred BMP Recommendation (slight) Changes
Previous Recommendations• Maintain/Enhance/Create Marsh
and/or Riparian Buffer• Plant Marsh with Sill• Groin Field with Beach Nourishment• Maintain Beach or Offshore
Breakwater with Beach Nourishment• Revetment
New Recommendations• Non-Structural Living Shoreline• Plant Marsh with Sill• Groin Field with Beach Nourishment• Maintain Beach or Offshore
Breakwater with Beach Nourishment• Revetment• Bulkhead Toe Revetment
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Note: Shoreline BMP Definition• It is important to read the definition
of the BMP for more details
• Definition provides potential alternative approaches and placement of BMP and other details:
• Based on:• Ability to grade bank• Navigation needs/limitations• Length of shoreline being
treated
• Helps determine the best BMP approach for the shoreline
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Note: Shoreline BMP Definition
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Shoreline BMP Glossary
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Shoreline BMP Glossary
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Shoreline Management Model (v.5)2) Preferred BMP Recommendation (slight) Changes
Previous Recommendations• Maintain/Enhance/Create Marsh• Plant Marsh with Sill• Groin Field with Beach Nourishment• Maintain Beach or Offshore Breakwater
with Beach Nourishment• Revetment• Area of Special Concern
• Residential canals• Industrial and commercial hardened
shoreline • Sand spits
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Shoreline Management Model (v.5)2) Preferred BMP Recommendation (slight) Changes
Previous Recommendations• Maintain/Enhance/Create Marsh• Plant Marsh with Sill• Groin Field with Beach Nourishment• Maintain Beach or Offshore Breakwater
with Beach Nourishment• Revetment• Area of Special Concern
• Residential canals• Industrial and commercial hardened
shoreline • Sand spits
New Recommendations• Non-Structural Living Shoreline• Plant Marsh with Sill• Groin Field with Beach Nourishment• Maintain Beach or Offshore
Breakwater with Beach Nourishment• Revetment• Bulkhead Toe Revetment• Special Consideration Areas
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Shoreline Management Model (v.5)• Residential Canals
Now get a specific BMP recommendation
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Shoreline Management Model (v.5)Special Consideration Areas• Highly Modified Areas
Industrial and Commercial hardened shoreline areas
Shoreline management options may be limited by:
• Highly developed upland • Adjacent infrastructure (e.g. road) • Navigation needs/limitations
Recommendation:• Seek expert advice on the design of
your project.
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Shoreline Management Model (v.5)Special Consideration Areas• Special Geomorphic Area
Sand Spits
Recommendation:
• Maintain the natural condition of this shoreline to allow for unimpeded sediment movement and the corresponding response of wetlands, beach and/or dune.
These features are dynamic.
• If primary structures are present and threatened, seek expert advice on the design of your project.
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Shoreline Management Model (v.5)Special Consideration Areas• Ecological Conflict
Management options for shorelines may be limited by the presence of Submerged Aquatic Vegetation (SAV).
Recommendation:
• Seek advice from the Virginia Marine Resources Commission Habitat Management Division http://www.mrc.virginia.gov/.
Model now factors in presence of Submerged Aquatic Vegetation (SAV)
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Shoreline Management Model Updates (v.5) SUMMARY
• The model now factors in:• Existing defense structures and SAV along a shoreline
• Bulkhead Toe Revetment is now a recommendation
• Maintain/Enhance/Create Marsh and/or Riparian Buffer is now called Non-Structural Living Shoreline
• Areas of Special Concern are no longer in model• Residential Canals now get a specific BMP
• Special Consideration Areas (new) – Areas where preferred management options may be limited• Highly Modified Area• Special Geomorphic Area• Ecological Conflict
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Questions?
Christine TomblesonCenter for Coastal Resources Management
804-684-7912 [email protected]