Coastal State Indicators for Coastal Erosion

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					        Concepts and Science for
        Coastal Erosion Management




Coastal State Indicators for
     Coastal Erosion

      James Sutherland
       HR Wallingford
                 Concepts and Science for
                 Coastal Erosion Management


Coastal State Indicators for Coastal Erosion
  • Indicators used in many fields to
    assess progress in implementing
    policy
  • Coastal State Indicators are a “reduced
    set of parameters that can simply,
    adequately and quantitatively describe
    the dynamic-state and evolutionary
    trends of a coastal system.”
    – Jiménez and van Koningsveld, 2002
                   Concepts and Science for
                   Coastal Erosion Management


Coastal State Indicators for Coastal Erosion
Coastal State Indicators (CSIs) should be:
• Relevant
• Measurable
• Responsive to disturbance in known way
• Anticipatory
• Integrative
  – Combining data and knowledge of processes to
    assist in implementing a policy
                Concepts and Science for
                Coastal Erosion Management


Coastal State Indicators for Coastal Erosion
  Functions of Coastal State Indicators:
  • Assess condition of environment
  • Compare across situations
  • Monitor trends
  • Diagnose problems
  • Anticipate need for intervention
                  Concepts and Science for
                  Coastal Erosion Management


Coastal State Indicators for Coastal Erosion
  Coastal State Indicators at Pilot Sites
                Concepts and Science for
                Coastal Erosion Management


Coastal State Indicators for Coastal Erosion
 CSIs used to implement policy
                Concepts and Science for
                Coastal Erosion Management

Coastal State Indicators for Coastal Erosion
                      Concepts and Science for
                      Coastal Erosion Management

Coastal State Indicators for Coastal Erosion
Site           Strategic Objective            Tactical Objective

Holland coast Safety, sustainable values Dune strength
              and functions              Hold the line
                                              Adapt to SLR
Hel Peninsula Preserve peninsula              Maintain beach
                                              width
Danube Delta   Sustainable development        Reduce erosion
Costa Brava    Carrying capacity, safety      Maintain beach
               of infrastructure              configuration
Inch           Sustainable tourism            Prevent damage
Pevensey Bay Sustainable risk mgmt            Hold the line
                  Concepts and Science for
                  Coastal Erosion Management

Coastal State Indicators for Coastal Erosion

  • Policies have implicit physical
    characteristics
  • E.g. Hold the line:
    – Position
    – Standard of protection
              Concepts and Science for
              Coastal Erosion Management


      Coastal State Indicators
• Dune strength, Barrier width,
  Backshore width, Dune zone width,
  Dune zone height, Total barrier volume
• Testing coastline, Beach width, Barrier
  crest position, Shoreline position,
• Coastal foundation, Shoreface volume,
  Coastal slope
              Concepts and Science for
              Coastal Erosion Management


      Coastal State Indicators
Prevention of breaching
• Dune strength, Barrier width,
  Backshore width, Dune zone width,
  Dune zone height, Total barrier volume
                  Concepts and Science for
                  Coastal Erosion Management

Coastal State Indicators for Coastal Erosion

  • Dune strength
    – Erosion during storm
               Concepts and Science for
               Coastal Erosion Management


      Coastal State Indicators
Maintain position
• Testing coastline, Beach width, Barrier
  crest position, Shoreline position,
                  Concepts and Science for
                  Coastal Erosion Management

Coastal State Indicators for Coastal Erosion
• Coastline position:         Momentary coastline: MCL,
                              Testing Coastline: TCL,
                 MCL
                              Basal Coastline, BCL
                              TCL is CSI (MCL is not)
                              BCL is threshold
                Concepts and Science for
                Coastal Erosion Management


       Coastal State Indicators
• Coastal foundation, Shoreface volume,
  Coastal slope
  – Large scale and long term,
  – Provide boundary conditions for other CSIs,
  – Coastal foundation is coastal area multiplied
    by rate of sea level rise,
  – Coastal slope is an indicator of the relative
    risk of inundation and the potential rapidity
    of shoreline retreat.
                 Concepts and Science for
                 Coastal Erosion Management

Coastal State Indicators for Coastal Erosion

  Why do we need CSIs?
  • We have data and models
  • These form evidence for decision making

  CSIs are appropriate
                  Concepts and Science for
                  Coastal Erosion Management

Coastal State Indicators for Coastal Erosion

  Why CSIs are appropriate:
  • Direct link to policy
  • Communication with policy makers and
    stakeholders
  • Skills of coastal managers:
    – Not numerical modellers
    – Not necessarily coastal scientists/engineers
  • Use of resources
               Concepts and Science for
               Coastal Erosion Management


      Coastal State Indicators
• Derived from analysis of system
  – Understanding state of system
  – Given a policy to implement
  – Chosen a means to implement the policy
  – Require thresholds
  – Adaptive management
                Concepts and Science for
                Coastal Erosion Management


       Coastal State Indicators
• Are being regularly used at three pilot
  sites;
• Are being developed at the other three.
• Not just data
• Integrate policy, system understanding
  and modelling
• Usable and communicable

				
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posted:5/1/2012
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