ocrm-sea grant beach summit 1 29 07

ocrm-sea grant beach summit 1 29 07 - SCDHEC/OCRM-SC Sea...

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SCDHEC/OCRM-SC Sea Grant Beachfront Management Summit Draft Meeting Notes January 8, 2007 Notes from each presentation are followed by excerpts from the panel discussion, and finally “summary recommendations” taken from the Summit. Please review and provide any edits or additions through “tracked changes.” I. Panel Presentations SC’s Changing Shoreline Guest Panelist: Paul Gayes, Coastal Carolina University 1. What is driving shoreline change? Sea level rise Sediment supply Storm and coastal processes Manipulations of systems 2. Nature of change Cyclical (i.e. inlet bypassing) Chronic (long term) Episodic (i.e. storm event) 3. Shoreline Migration v. Coastal Erosion Erosion is a natural process, not caused by development. Erosion is complicated when interrupted by development 4. Options to deal with erosion: Retreat Defend (examples: large scale manipulation, groins, seawalls) Delay (beach renourishment - where SC is today) 5. Beach Renourishment Using renourishment as midterm solution Folly Beach example - success by most indicators, sand volumes lasting longer than projected (half of sand placed remained after 13 years, only localized hot spots, structures at risk) SC has a retreat policy (on the books) but is delaying it with renourishment Limited sand resources but increasing development 6. How long is midterm? Indefinitely in some places but not all. Other factors: sea level rise (flooding at high tide will be more frequent with another foot increase in 60-100 years), will create drainage and water quality issues, little protection against big storm events.
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7. Long Term More focus has been on shoreline rather than entire system, and system is dynamic Solutions only address portions of system Environmental Impacts of Shoreline Changes Guest Panelist: Bob Van Dolah, SCDNR (write out) Concerns - Changes in beach characteristics due to renourishment projects 1. Direct impacts on the beach (duration of effects) Invertebrate community, Turtle nesting, Bird populations, Duration of effects 2. Changes in borrow area characteristics Impacts to bottom invertebrates, impacts to fish and invertebrate predators, alteration of sediment characteristics, duration of effects 3. Indirect impacts a. Nearshore zone impacts Infaunal invertebrate community in surf zone, impacts to fish and crustaceans, possible burial of nearshore hard bottom habitats (Grand Strand area) b. Effects on Inlet Dynamics Shoaling of inlets, changes in inlet stability Studies A series of studies have been conducted over the years. Bob conducted a summary of these projects in 1995 as part of the BERM Monitoring Program for the National Research Council Review. SCDNR is conducting a SE MetaAnalysis BACI Review (in progress @ DNR, contact
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ocrm-sea grant beach summit 1 29 07 - SCDHEC/OCRM-SC Sea...

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