Screen capture from the Sea Level Affecting Marshes Model (SLAMM)

Sea Level Affecting Marshes Model (SLAMM)

This open-source downloadable model uses digital elevation data and other information to simulate potential impacts of long-term sea level rise on wetlands and shorelines.

The Sea Level Affecting Marshes Model (SLAMM) simulates the dominant processes involved in wetland conversions and shoreline modifications during long-term sea level rise. Map distributions of wetlands are predicted under conditions of accelerated sea level rise, and results are summarized in tabular and graphical form. SLAMM has been used in several geographies and applications across the nation since its development in the mid-1980s.


  • Addresses various wetland scenarios, including inundation, erosion, overwash, saturation, and salinity
  • Computes relative sea level change for time sequences of 5 to 25 years
  • Incorporates areas protected by dikes and other hard structures if needed
  • Incorporates sedimentation and accretion rates and provides options for computing erosion
  • Incorporates standard coastal wetland classes
  • Provides outputs that can be viewed in a geographic information system (GIS) or other software for additional analysis
Last modified
21 June 2021 - 4:39pm