SLIDE 1 Sunset Beach Community meeting 6/4/2019
SEA LEVEL RISE, THE COASTAL COMMISSION, AND LOCAL ADAPTATION PLANNING
Photo Credit: Gabe Buhr
Cardiff State Beach | King Tide, Nov. 25, 2015
Carey Batha
Climate Change Specialist
SLIDE 2
- 1. Climate change and sea level rise (SLR)
- 2. Coastal Commission, the Coastal Act, and SLR
- 3. How local plans can address SLR
- 4. What’s going on statewide to address SLR?
OUTLINE
SLIDE 3
Enhancement of greenhouse effect Carbon dioxide, methane, and nitrous oxide Primarily due to burning of fossil fuels, land use changes Feedback processes
CAUSES OF GLOBAL CLIMATE CHANGE
SLIDE 4
OBSERVED TEMPERATURE INCREASE
SLIDE 5 CAUSES OF SEA LEVEL RISE
Thermal expansion Melting of land ice
5
SLIDE 6
OBSERVED SEA LEVEL RISE
?
SLIDE 7 SLR PROJECTIONS
Source: Moffat & Nichol
SLIDE 8
Inundation – increased extent of permanently wet areas Erosion – increased erosion of bluffs, dunes, and beaches Flooding – increased extent storm floods (temporarily wet) Saltwater intrusion – invasion of saltwater into freshwater aquifers
PHYSICAL IMPACTS OF SEA LEVEL RISE
SLIDE 9 FLOODING
Video: Aaron Eudaley
SLIDE 10 Sunset Beach, CA
California King Tides Initiative
“SUNNY DAY” FLOODING
SLIDE 11 EROSION
Credit: Duncan Sinfield/YouTube
SLIDE 12
NARROWING BEACHES
SLIDE 13
BOLSA CHICA STATE BEACH INLET, HUNTINGTON BEACH 12/23/2018
SLIDE 14 Heberger 2009
- $40 billion coastal and ocean economy (NOEP 2010)
- 100-year coastal flood with 4.6 ft of sea level rise:
- 41 square miles of coastal land
- 7 wastewater treatment plants
- 14 power plants
- 250 miles of highways, including Highway 1
- 1500 miles of roads
- 110 miles of railways
- 550 square miles of critical coastal wetlands
Costs of inaction are 4 to 10 could be times greater than the costs of proactive adaptation/mitigation (Moser et al. 2014)
WHAT’S AT STAKE
SLIDE 15 AGENCY MISSION
Protecting and enhancing California’s coast and
- cean for present and future generations
SLIDE 16 BACKGROUND
COASTAL ACT POLICIES
16
SLIDE 17 BACKGROUND
COASTAL ACT POLICIES
Protection of:
- 30210: Public Access
- 30230: Marine Resources
- Biological productivity, water quality
- Limitation on fill; oil spill prevention
- 30240, 30241: Land Resources
- Environmentally sensitive habitat areas
- Prime agricultural land
- 30213, 30220-30222: Water-Oriented Rec. Uses
- Coastal areas suited for recreation, facilities and accommodations
- 30244: Archaeological & Paleontological
- 30251: Scenic and Visual Qualities
SLIDE 18 BACKGROUND
COASTAL ACT POLICIES Section 30235: Shoreline Protection
allowed for…
- Coastal dependent uses
- Public beaches
- Existing structures
- …In danger from erosion
With MITIGATION for:
- Loss of beach and sand
- Other unavoidable impacts (e.g., to public access,
recreational opportunities)
SLIDE 19 BACKGROUND
COASTAL ACT POLICIES Section 30253: New Development shall…
- Minimize risks to life & property
- Assure stability & structural integrity
- Neither create nor contribute to erosion
- Assure no protective devices needed that would
substantially alter natural landforms along bluffs and cliff
SLIDE 20 BACKGROUND
CALIFORNIA COASTAL COMMISSION
COASTAL DEVELOPMENT PERMITS
LOCAL COASTAL PROGRAMS (LCPs) PARTNERSHIPS & WORK GROUPS
Public Resources Code Division 20
Califor ifornia ia Coastal tal Act
(1976)
SLIDE 21
COASTAL COMMISSION GUIDANCE
Coming soon…. Local Coastal Program Adaptation Guidance for criti itica cal in infrast stru ruct cture re Adopted 2015 Updated 2018 Public Review Draft In development
SLIDE 22 SLR POLICY GUIDANCE
PLANNING STEPS
Adaptation planning
- Planning horizons
- Hazards types
- Coastal Act
resources
- Coastal Act resources
- LCP policies/ordinances
- Project alternatives
Vulnerability assessment
SLIDE 23
HUNTINGTON BEACH VULNERABILITY ASSESSMENT (2014)
SLIDE 24
COASTAL COMMISSION GUIDANCE
Coming soon…. Local Coastal Program Adaptation Guidance for criti itica cal in infrast stru ruct cture re Adopted 2015 Updated 2018 Public Review Draft In development
SLIDE 25
ADAPTATION OPTIONS: BEACH NOURISHMENT
SLIDE 26 ADAPTATION OPTIONS: SEND RETENTION WITH GROINS & BREAKWATERS
Photo: Carey Batha Photo: California Coastal Records Project
SLIDE 27
ADAPTATION OPTIONS: RELOCATION
SLIDE 28 ADAPTATION OPTIONS: SETBACKS
Photo: California Coastal Records Project
SLIDE 29 ADAPTATION OPTIONS: HABITAT RESTORATION
Ocean Beach Master Plan and the San Francisco LCP Amendment
SLIDE 30
ADAPTATION OPTIONS: ARMORING
SLIDE 31
…~$6.8 million for… …50 projects to… …37 jurisdictions 5 grant rounds have awarded…
LOCAL GOVERNMENT PARTNERSHIP
SLIDE 32
THANK YOU!
coastal.ca.gov/climate/slr Carey.Batha@coastal.ca.gov
