Calculating the costs and benefits of managed realignment

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Calculating the costs and benefits of managed
realignment

• TYNDALL CENTRE
• UEA, CSERGE, CEFAS, POL, ESSEX

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Project context

• Climate change and sea level rise
• Coastal defence or managed realignment ?
• Wetlands trap N and P, and store C
• Value of these benefits?
• Tyndall flagship project regional coastal
  simulator

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Modelling

• Hydrodynamic model (POL)
• Advection diffusion model
• Water levels, sediment movement, nutrient flows
  and carbon storage
• Applied to current estuarine and various managed
  realignment conditions

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Modelling

• MR areas assigned habitat and biogeochemical
  function by elevation
• Nutrient cycling processes
• Denitrification
• Particle exchange and storage of phosphorus
• Primary production and C storage
• Effect of colonisation scenarios and MR area
  placement.

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Denitrification (Dw) in the Wash
January
July
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Present day
Holocene
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Generic approaches to linkage Direct
New Morphology
Old morphology
HB model
HB model
WQ/Ecol model
WQ/Ecol model
Changes in WQ/Ecol
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Generic approaches to linkage Indirect

• TD,HB models
• Expert analysis
• Historical data.

New Morphology
Old morphology
BU model
BU model
WQ/Ecol model
WQ/Ecol model
Changes in WQ/Ecol
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Socio-economic analysis

• Full cost-benefit analysis of managed realignment
  scenarios (CSERGE)
• Benefits of nutrient storage
• Benefits of habitat creation and flood defence
• Costs of lost agricultural land
• Advice on areas where economic benefits of
  managed realignment are high.