Concepts and Science for Coastal Erosion Management Coastal State Indicators for Coastal Erosion...
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Transcript of 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
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 ErosionSite Strategic Objective Tactical Objective
Holland coast Safety, sustainable values and functions
Dune strength
Hold the line
Adapt to SLR
Hel Peninsula Preserve peninsula Maintain beach width
Danube Delta Sustainable development Reduce erosion
Costa Brava Carrying capacity, safety of infrastructure
Maintain beach 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:
MCL
Momentary coastline: MCL,
Testing Coastline: TCL,
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