![Page 1: Concepts and Science for Coastal Erosion Management Data, Information and Tools for Effective Coastal Erosion Management James Sutherland HR Wallingford](https://reader035.vdocument.in/reader035/viewer/2022070408/56649e715503460f94b7035c/html5/thumbnails/1.jpg)
Concepts and Science for Coastal Erosion Management
Data, Information and Tools for Effective Coastal Erosion
Management
James Sutherland
HR Wallingford
![Page 2: Concepts and Science for Coastal Erosion Management Data, Information and Tools for Effective Coastal Erosion Management James Sutherland HR Wallingford](https://reader035.vdocument.in/reader035/viewer/2022070408/56649e715503460f94b7035c/html5/thumbnails/2.jpg)
Concepts and Science for Coastal Erosion Management
Data, Information and Tools for Effective Coastal Erosion Management
• We live in a data-rich age– If you can afford it
• There are many ways of collecting lots of data– From megabytes to terabytes
• Increased volumes of data do not necessarily help coastal management– Drowning in numbers
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Concepts and Science for Coastal Erosion Management
Data, Information and Tools for Effective Coastal Erosion Management
Purpose of this presentation:
• Review beach monitoring methods
• Review numerical modelling tools– Not necessarily useful for management
• Review data handling/display tools
• Explain role of coastal state indicators
• Provide monitoring guidance
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Concepts and Science for Coastal Erosion Management
Monitoring methods
• Point measurements– Tell-tail scour monitor
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Concepts and Science for Coastal Erosion Management
Monitoring methods
• Cross-shore profiles– Theodolite,Total station, – DGPS, – CRAB, WESP,– laser scanner,– Argus or other camera system,– X-band radar.
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Concepts and Science for Coastal Erosion Management
Monitoring methods
• Map tidelines,• Ortho-rectified aerial
or satellite photos,• Topographic lidar • Bathymetric lidar• Synthetic aperture
radar – (side-looking airborne
radar)
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Concepts and Science for Coastal Erosion Management
Data management and display
• Modern systems capable of handling huge volumes of data through the data life-cycle
• Increasing importance of meta-data and international standards
• Measure once, use often
• Central data stores
• Use of GIS
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Concepts and Science for Coastal Erosion Management
Numerical Models for Erosion Management
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Concepts and Science for Coastal Erosion Management
Tools for Erosion Management
• Historical trend analysis– Often least-squares linear trend;– More sophisticated methods require more
data of better quality– Prediction relies on continuation of
historic trend
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Concepts and Science for Coastal Erosion Management
Numerical Models for Erosion Management
• One-line models– Simple but robust– Used to model decades of shoreline
positions
• Coastal profile models– Cross-shore erosion under storms– Poor at modelling beach recovery after
storms– Used to model days to weeks
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Concepts and Science for Coastal Erosion Management
Numerical Models for Erosion Management
• Coastal area models– Flows + waves + sediment transport +
morphology– Model areas are 102 to 104 km2
– Model simulates days to weeks– Extension to longer timescales through
simplification
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Concepts and Science for Coastal Erosion Management
Numerical Models for Erosion Management
• System models of morphology– SCAPE and ASMITA– Model simplified interactions between
elements;– Simulations of 10 to 103 years– Limited spatial resolution
• Systems models of flooding– RASP and PAMS in UK, VNK in NL
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Concepts and Science for Coastal Erosion Management
COAST3D question
• How can we use models and data to assist coastal management?
• Most detailed process models do not answer questions at the time and space scales that are of interest to coastal managers
• One approach is to use Coastal State Indicators
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Concepts and Science for Coastal Erosion Management
Coastal State Indicators
• “Coastal State Indicators for Coastal Erosion”– Tuesday, Session 18 ‘Coastal Erosion
Indicators’, 16:30 – 16:45, Europa Auditorium
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Concepts and Science for Coastal Erosion Management
Coastal State Indicators
• 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
• Indicators used in implementing a policy
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Concepts and Science for Coastal Erosion Management
Frame of Reference
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Concepts and Science for Coastal Erosion Management
Frame of Reference
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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
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Concepts and Science for Coastal Erosion Management
Coastal State Indicators
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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
• Momentary coastline, Beach width, Barrier crest position, Shoreline position,
• Coastal foundation, Shoreface volume, coastal slope
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Concepts and Science for Coastal Erosion Management
Coastal State Indicators
• Are being regularly used at three pilot sites;
• Are appropriate for the users;
• Not just data– Require a policy– Require a threshold
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Concepts and Science for Coastal Erosion Management
Monitoring guidance
• Monitor for a purpose:– Understand system– Derive coastal state indicators– Measure coastal state indicators
• Different stages may require different data
• Establish ground controls and datum
• Set standards