living shorelines - department of natural...
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Living Shorelines
Using an Integrated Planting Approach
Presented by Chris MillerPlant Materials Specialist
USDA-NRCSCape May Plant Materials Center
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Properly evaluating site conditions
* Adequate sand supply?* Shoreline orientation/shape?* Fetch distance/wave height?* boat wake?* naturally occurring vegetation?* salinity concentration?* adjacent structural measures?
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SHORELINE STABILIZATION
Vegetative Treatment Potential• Fetch• Shape• Orientation• Boat Traffic
– Width– Slope– Vegetation– Soil Conditions
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Vegetated Treatment Potential
FETCH < 0.5 mi 0.5 – 1.4 1.5 – 3.4 3.5 – 4.9 > 5.08 7 4 2 0
SHAPE Coves Irregular Shoreline Headland or straight8 3 0
ORIENT 0.5 mi fetch W to N S to W S to E N to E5 3 2 1 0
BOATTRAFFIC
None 1 – 10 per wk@ .5 mi
10 0.5 mi
1 – 10 100 yds
> 10100 yds
5 3 2 1 0
TOTALTotal VTP
23 26 Excellent20 22 Very Good16 19 Good13 15 Fair0 13 Poor
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VTP, cont’dSubtotal
BEACH > 10 ft 7 - 10 3 - 6 < 3W IDTH 3 2 1 0
PLANT > 20 ft 15 - 20 14 - 10 < 10 ftW IDTH 3 2 1 NG
BEACH < 8 % 8 – 14 15 – 20 > 20 %SLOPE 6 3 1 0
BEACH Veg below toe of slope No veg below toeVEG 3 0
SAND > 10 in 3 – 10 < 3 in
DEPTH 3 2 0
TOTALTotal VTP
33 40 Good24 32 Fair16 23 Poor0 16 Do not plant
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Site Constraints*3-4 mile fetch
*N to E orientation*Straight shoreline*heavy boat traffic
*lack of littoral sand
After Installation One year later
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Planting GuidelinesPlant in as dry a condition as possible
Plant low marsh with Spartina alterniflora on two-three foot centers
Plant from mean tide to mean high tide.
Use Osmocote slow release fertilizer 18-6-12
Acclimate plants to site salinity
Set up monitoring before planting
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Misuse of erosion controlproducts. Not designed tofunction as a wave break.
Not all coir fiber logs are createdequal. Once netting is damaged,the log is compromised.
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Chesapeake Bay Bluffs
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Factors affecting bluff stabilization
• Surface Water - creates rill/gully erosion• Ground Water - creates slumping and
slope instability• Bay Water – wave energy creates toe
erosion
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Traditional Approach
• Not the best approach for long term sustainability of the site.
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Integrated Approach
• The integrated approach incorporates soil bioengineering techniques using a combination of woody and herbaceous plant materials in various forms
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Coastal Bluff Stabilization Full sun/Drought tolerant Species
• Bayberry (Morella pensylvanica)
• Dwarf sumac (Rhus copallina)
• Sand cherry (Prunus depressa)
• Sweetfern (Comptonia peregrina)
• Indigobush (Amorpha fruticosa)
• Groundsel (Baccharis halimifolia)
• American beachgrass (Ammophila breveligulata)
• Coastal panicgrass (Panicum amarulum)
• Switchgrass (Panicum virgatum)
• Saltmeadow cordgrass (Spartina patens)
• Coastal little bluestem (Schizachyrium scoparium var. littorale)
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Bluff Treatment
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‘Cape’ american beachgrass(Ammophila breviligulata)
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‘Avalon’ Saltmeadow Cordgrass
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Native Warm Season Grasses
• Switchgrass plug root development within 3 months.
• Tolerate periods of drought well.
• Deep root system allows for soil/bank reinforcement
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Switchgrass (Panicum virgatum)
• Natural Habitat: Dry to wet, sterile and acid, sandy soil. Upper edges of salt marshes and stream banks.
• Description: A moderately tall (3-6 ft.) perennial, warm season bunchgrass which produces a large amount of leaf biomass. A distinguishing characteristic is the fine fringe of hairs present in the leaf axils. The large, spreading inflorescence casts a purple tinge when flowering. Flowers and seed are borne singly at the ends of the flowering branches. This plant is a prolific seed producer. These smooth, shiny seeds mature from September-October.
• Uses: erosion control, forage, wildlife, ornamental
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High Tide Germplasm switchgrass
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‘Atlantic’ coastal panicgrass(Panicum amarulum)
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Freshwater Cordgrass (Spartina pectinata)
Cape May Plant Center
-Long Island population
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Giant Cordgrass (Spartina cynosuroides)
Chesapeake Bay population
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Eastern gamagrass (Tripsacum dactyloides)
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Coastal Little Bluestem
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Seaside Goldenrod
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BEACH PLUM: This long-lived native species thrives in environments with salt, apparent drought and frequent
disturbances, where their neighbors are often short lived.
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Beach Plum fruit
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Soil Bioengineering Species Limited rooting ability
• Buttonbush (Cephalanthus occidentalis)• Elderberry (Sambucus canadensis)*• Ninebark (Physocarpus opulifolia)*• Arrowwood, Blackhaw (Viburnum spp.)*• Groundsel (Baccharis halimifolia)• Indigobush (Amorpha fruticosa)
• * indicates shade tolerance
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Indigobush (Amorpha fruticosa)
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Groundsel Bush
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Soil Bioengineering Species Bare root/Containerized
• Alder species (Alnus spp.)*• Red/Black chokeberry (Aronia spp.)*• Gray dogwood (Cornus racemosa)*• Sweet pepperbush (Clethra alnifolia)*• Winterberry holly (Ilex verticillata)*• Spicebush (Lindera benzoin)*• Witch-hazel (Hamamelis virginiana)*• Highbush blueberry (Vaccinium corymbosum)*• Bayberry (Morella pensylvanica)• Dwarf sumac (Rhus copallina)• Sweetfern (Comptonia peregina)
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Bayberry
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Dwarf Sumac (Rhus copallina)
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Sweetfern (Comptonia peregrina)
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Soil Bioengineering
• Soil Bioengineering: The practice of utilizing plant materials alone in such a way as to perform a structural function of stabilization
• Biotechnical Stabilization: Utilizing a combination of plants, geotextile fabrics, and/or structural measures for stabilization.
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Vegetative ConsiderationsPlanting Techniques
• Seeding vs vegetative material• Plant types
– Dormant unrooted– Bare root– Containerized
Native or naturalized materials?• Caution with invasive plants
– Polygonum– Crownvetch
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Woody Plant Functions Soil Bioengineering Systems
• Root reinforcement - root tensile strength mechanically reinforces soil.
• Soil moisture depletion - remove excess soil water through evapotranspiration.
• Buttressing and Arching - anchored & embedded stems/roots counteract downslope shear forces.
• Flexible stems deflect erosive energy
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Soil Bioengineering Systems “Keystone Species”
Species
Shrub willows (Salix spp.)
Rooting Success
70%-100%
Shrub dogwoods
(Cornus spp.)
30%-70%
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Willow Whips• 3/8” to 5/8” in diameter• 4-8 ft. in length• Cut when dormant• Nursery grown; same
diameter/branching pattern
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Pussy Willow
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Silky willow
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Prairie Willow
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‘Ruby’ redosier dogwood(Cornus serecia)
Developed because of it’sprolific layering ability.
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Soil Bioengineering
• Utilizes vegetation to provide some structural support to the slope.
• Examples– Fascines– Brushmattressing– Live Staking
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A “living” live stake
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Installation of brushmattress After one growing season
Brushmattress Installation
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Other Plant Forms
• Unrooted cuttings• Bare Root• Tubelings• Container
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Unrooted Cuttings• 1/4”-3/8” diameter• 8”-12” length• Perform better in moist
soils• May be planted through
erosion control fabric
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Rooted (bare root) plants• field dug, bare root• 3/8” at root collar• Root gel (Terrasorb)
increases survival in higher, drier bank zones
• May be planted though erosion control fabric
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Tubelings
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Containerized Plants
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Plant Materials Costs
Plant Form Approximate Cost Unrooted cuttings $0.45-$0.75
Live stakes (1-3 ft.) $1.00-$1.50 Willow whips (4’-8’) $1.00-$3.00 Tubelings $1.25-$1.75 Bare root ( 1-0) $1.00-$2.00 Container (1 gal) $ 3.00-$12.00
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Planting Trial Red Point-Cecil County
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Red Point-Cecil County
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Dormant Shrub Willow Planting
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Herbaceous Plantings of beachgrass/saltmeadow cordgrass
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General Bluff Planting Alternatives
• Establish good herbaceous cover then incorporate containerized, bare root, or dormant unrooted shrubs, but no trees
• Plant a few scattered “mother” plants of well adapted shrub species and allow for natural succession due to seed dispersal
• Use the “Vegetative Barriers” approach to slope protection. Plant beachgrass, saltmeadow cordgrass, and/or coastal panicgrass on a tight (6”-8”) spacing within a row. Plant 2-3 rows one foot apart
• Soil bioengineering techniques may be used where water may be piping out of the slope.
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Is Time Running Out?