08c022009b 1 status report on the re-evaluation of the louisiana coastal zone boundary dr. john day...
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Status Report on the Re-evaluation of the Louisiana Coastal Zone BoundaryStatus Report on the Re-evaluation of the Louisiana Coastal Zone Boundary
Dr. John Day
December 9, 2009
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PROJECT OVERVIEWPROJECT OVERVIEW• Technical and Analytical Support Services to the
Office of Coastal Management for Re-evaluation of the Inland Boundary of the Louisiana Coastal Zone.
– Task 1 – Data Acquisition and Background Review
– Task 2 – Development of Methodology, Data Compilation and Analysis
• Stakeholder input
– Task 3 – Data Interpretation and Report Preparation
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1975 Boundary Criteria1975 Boundary Criteria
• Regional Topographic Correlative Criteria– Geology = Pleistocene/Recent contact– Elevation = 5 and 25-ft contours– Soils = hydric/non-hydric boundary– Vegetation boundary = wetland/non-wetland– One hundred year flood and tidal inundation level
• Point Location Correlative Criteria– Salinity = inland intrusion– Range or inland occurrence of brackish water clam, blue
crab, fish (e.g., Striped mullet), birds (migrating waterfowl), mammals (e.g., Eastern mole), reptiles (e.g., Fence lizard)
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2009 Boundary Criteria2009 Boundary Criteria
• Vegetation • Current elevation• Predicted subsidence/sea level rise• Inundation - storm surge• Watershed boundaries• Boundaries of existing coastal programs
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Methodology Methodology
• An updated inland Coastal Zone Boundary should encompass:– all areas subject to coastal processes; and– all uses which have the potential to impact coastal
waters• The degree of management needed will vary by
location and use• Therefore, a tiered approach is proposed, with
each tier defined by science based parameters and criteria to determine regulatory and non-regulatory policies and management scenarios
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Proposed Tiered ApproachProposed Tiered Approach
• TIER 1: Regulation by means of the Coastal Use Permitting Procedure
• TIER 2: Regulatory oversight by means of the Consistency Determination Procedure
• TIER 3: Non-regulatory management through incentive programs and planning initiatives
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Tiering Criteria Based on Area and UseTiering Criteria Based on Area and Use
• Some of the factors that affect tiering criteria include– Potential effect on coastal waters– Nature of proposed land or water use– Federally excluded lands (e.g., fastlands,
federally-owned lands)– Deepwater port, harbor, or terminal district– Current land use– Elevation (sea level rise, storm surge)
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Scientific MethodologyScientific Methodology
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CZB Decision MatrixCZB Decision Matrix
• State of LA?• Watershed that touches the coast?• Area of other LA coastal programs?• Area of inundation per MOMS/ADCIRC?• Affected by sea level rise (<8 ft)?• Below the Pleistocene Terrace?• Intermediate, brackish, saline marsh?• Freshwater wetland in certain circumstances?
– Contiguous to marsh in the current coastal zone– Adjacent to water body with tidal influence
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Watershed that Touches the CoastWatershed that Touches the Coast
Activities within these watersheds can have a direct impact on coastal waters
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Area of Inundation per Hydrologic Modeling (e.g., MOMS, ADCIRC)
Area of Inundation per Hydrologic Modeling (e.g., MOMS, ADCIRC)
• Worst case scenario of storm surge
• Will encompass areas subject to coastal processes in extreme events
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Historical Global Sea Level RiseAdditional 3 ft by 2100
Historical Global Sea Level RiseAdditional 3 ft by 2100
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Area Vulnerable to Sea Level RiseArea Vulnerable to Sea Level Rise
• 3 ft expected sea level rise over next century
• Area below 5 ft may become wetland
• What’s 8 ft now will be 5 ft by end of century
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Chenier PlainChenier Plain
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Bayou LafourcheBayou Lafourche
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North ShoreNorth Shore
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• Political boundaries (e.g., parish boundary)
• Geographic boundaries (e.g., road)• Watershed boundaries (12-digit watershed
code per NRCS)• Socioeconomic factors
– Energy and infrastructure, marine commerce, coastal recreation, cultural factors, etc.
Adjustment of CZBAdjustment of CZB
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http://dnr.louisiana.gov/crm/
Dr. Terry Howey
Coastal Resources Administrator
Questions?Questions?