Sea Level Affecting Marshes Model (SLAMM)

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The Sea Level Affecting Marshes Model (SLAMM) simulates wetland conversions during sea level rise. It has been applied and improved since 1985 and used worldwide. The document describes how SLAMM models elevation, vegetation zones, accretion rates, and other parameters to project wetland impacts from sea level rise under various scenarios. It also notes limitations such as uncertainty in sea level projections and complexity of ground conditions and coastal dynamics.

1
Sea Level Affecting Marshes Model (SLAMM)
Simulates the dominant
processes involved in wetland
conversions during long term
sea level rise
Applied and improved since
1985
Used throughout the world
http://www.warrenpinnacle.com/prof/SLAMM/

2
Sea Level Affecting Marshes Model (SLAMM)
Distance Inland
Elevation
Tidal Flat Saltmarsh Scrub-
Shrub or
Brackish
Tidal Fresh and Dry Land
MLW
MTL
MHW
Salt Boundary

3
Sea Level Affecting Marshes Model (SLAMM)
Distance Inland
Elevation
Tidal Flat Saltmarsh Scrub-
Shrub or
Brackish
Tidal Fresh and
Dry Land
MLW
MTL
MHW
Salt Boundary
Water

4
Model Parameters
Accretion = 3.8 mm/yr
• Observations from NBNERR
(Raposa)
• Consistent with Median Value
from Literature
105 Sub-Sites
• Historic SLR Trend to estimate
subsidence/lift
• Direction offshore
• Erosion/sedimentation
• Storm Frequency
• Tidal Data
• Range
• Datum Adjustment

5
Model Limitations
Uncertainty in Sea Level Rise Projections
Ground Conditions
• Some uplands may be more suitable than others
• Multiple stressors on salt marshes
• Freshwater wetlands may convert to open water
Model Simplifications
• Accretion rates are variable
• Salinity dynamics are simplified
Changing Coastline
• Storm events
• Barrier migration

23
Sea Level Affecting Marshes Model (SLAMM)
Simulates the dominant
processes involved in wetland
conversions during long term
sea level rise
Applied and improved since
1985
Used throughout the world
http://www.warrenpinnacle.com/prof/SLAMM/

In this work the impact of the tidal wave on pollutant residence time within Nador lagoon has been computed using an Eulerian approach and a 2D hydrodynamical model. The model is based on the finite volume method; it solves the shallow water equations on spatial domain that represents the Nador lagoon. The residence time has been defined through the remnant function of a passive tracer released inside the lagoon. The renewal capacity of the Nador Lagoon has been investigated when forced by the astronomic tide. The influence of tidal wave on residence time has been defined by the return flow, and computed for two scenarios during winter and spring periods.

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Sea Level Affecting Marshes Model (SLAMM)

1. 1 Sea Level Affecting Marshes Model (SLAMM) Simulates the dominant processes involved in wetland conversions during long term sea level rise Applied and improved since 1985 Used throughout the world http://www.warrenpinnacle.com/prof/SLAMM/

2. 2 Sea Level Affecting Marshes Model (SLAMM) Distance Inland Elevation Tidal Flat Saltmarsh Scrub- Shrub or Brackish Tidal Fresh and Dry Land MLW MTL MHW Salt Boundary

3. 3 Sea Level Affecting Marshes Model (SLAMM) Distance Inland Elevation Tidal Flat Saltmarsh Scrub- Shrub or Brackish Tidal Fresh and Dry Land MLW MTL MHW Salt Boundary Water

4. 4 Model Parameters Accretion = 3.8 mm/yr • Observations from NBNERR (Raposa) • Consistent with Median Value from Literature 105 Sub-Sites • Historic SLR Trend to estimate subsidence/lift • Direction offshore • Erosion/sedimentation • Storm Frequency • Tidal Data • Range • Datum Adjustment

5. 5 Model Limitations Uncertainty in Sea Level Rise Projections Ground Conditions • Some uplands may be more suitable than others • Multiple stressors on salt marshes • Freshwater wetlands may convert to open water Model Simplifications • Accretion rates are variable • Salinity dynamics are simplified Changing Coastline • Storm events • Barrier migration

6. 6 Model Input: LiDAR 2011

7. 7 Model Input: NWI 2010

23. 23 Sea Level Affecting Marshes Model (SLAMM) Simulates the dominant processes involved in wetland conversions during long term sea level rise Applied and improved since 1985 Used throughout the world http://www.warrenpinnacle.com/prof/SLAMM/

Sea Level Affecting Marshes Model (SLAMM)

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