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Coastal Erosion Planning and Response Act (CEPRA) Project
Seaweed Enhanced Sand DunesJake Sigren
MOTIVATION
Sargassum Lack of Dune Protection
Heavy Sargassum Landings Management Practice
PROJECT IDEA
SEABALES (Compacted Sargassum)22 ft
5 ft
2.5 ft5.5 ft
What’s a Sea Bale?
We made about 120 of these total, this was the first.
Bales were positioned in front of the dune and then buried in sand.
Each Bale was about 2.5 ft x 2.5 ft x 2 ft. They weighed around 150 lbs. So a total of around 20,000 pounds of seaweed went into a pretty compact area.
PROFILE SURVEYS
P6 (with seabales)
P8 (without seabales)
Green: Sept. 2014 surveyBlue: Dec. 2014 survey
PENETROMETER TESTING
-50 0 50 100 150 200 250 300 3500
5
10
15
20
25
30
Dune (with bales)
Dune (no bales)
Force Needed to Penetrate Layer (psi)D
epth
(inc
hes)
Data collected in Sept. 2014
Existing Hard Compacted Sand
Seabale Location
BIOLOGICAL ASPECT
22 ft
5 ft
2.5 ft5.5 ft
PLANTS
Does vegetation grow better when planted on top of Sea Bales?
• Claims: Sediment Stability, Aggregation, and Accretion
PLANTS AND DUNES
Dune Accretion- 20 weeks
OTHER RESTORATION INTERESTS
Mycorrhizally active Panicum amarum root (100x)
Mycorrhizally inactive Panicum amarum root (100x)Rooted Plant
Sprig
QUESTIONS?