Also known as
Model type Modular
Model part of larger framework
Spatial dimensions
Spatial extent
Model domain Coastal, Marine
One-line model description Aggregate scale morphodynamic model of integrated coastal systems
Extended model description A length-, and time-averaged representation of coastal system elements including the inner shelf, shoreface, surfzone, inlet, inlet shoals, and estuary channels and tidal flats. The multi-line nature of the morphodynamic model allows it to represent large-scale sediment transport processes with a combination time-average physics empirical relationships. A major use is to represent the interactions between system components to develop with changes in large scale forcing such as accelerated sea level rise, changes in river sediment input (ie. dams), changes in estuary tide prisms (ie. dikes) and the like.

coastal morphdynamics, sediment transport,

First name Alan
Last name Niedoroda
Type of contact Model developer
Institute / Organization URS Corporation-Tallahassee Office
Postal address 1 1625 Summit Lake Drive
Postal address 2
Town / City Tallahassee
Postal code 32317
State Florida
Country United States
Email address
Phone 850 402 6349

First name Marcel
Last name Stive
Type of contact Model developer
Institute / Organization Delft Univeristy of Technology
Postal address 1
Postal address 2
Town / City Delft
Postal code
Country Netherlands
Email address

First name Z.B.
Last name Wang
Type of contact Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
Email address

Supported platforms Windows
Other platform
Programming language Fortran77
Other program language
Code optimized Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development 2000
Does model development still take place? No
If above answer is no, provide end year model development
Code development status
When did you indicate the 'code development status'?
Model availability As code, As teaching tool
Source code availability
(Or provide future intension)
Source web address
Source csdms web address
Program license type GPL v2
Program license type other
Memory requirements Ordinary PC or laptop
Typical run time Minutes

Describe input parameters Parameters:
  • A(I,J) - Angle between flow and grid coordinates {SG}
  • Ab(I) - Breaker angle {2}
  • ACENT - Angle of wave climate central tendency (0 is for crests parallel to the lower boundary)
  • ASTORM - Angle of dominant waves
  • Aw(I,J) - Angle between wave propagation & onshore direction {2}
  • Beta - Scales the exponent in the wave-drift
  • CK - Coef.scales rate of gravity-driven upper shoreface sed flux (3)
  • DELTAX - Longshore grid cell dimension (SG)
  • DELTAY - Cross-shore grid cell dimension (SG)
  • DC(I,J) - Cross-shore diff. flow coords.{1}
  • DCyyy - Controls the slope of the cross-shore diffusion coef. when it is *computed from a linear eqn.
  • DCzero - The offset in the above relationship
  • DCmax - Max. Limit for the cross-shore diff. coef.
  • DL(I,J) - Longshore diff. flow coords. {1}
  • DLyyy - Slope of the longshore diff. coef.
  • DLzero - Offset of the above.
  • DLmax - Max. Limit for the long-shore diff. coef.
  • DT - Time step in years
  • EDFACT - Controls relative converge/divergence of waves due to refraction (should mimic RFACT)
  • GFACT - Factor for the K(Cn)/(delrho)ga in the ls transp.eqn.
  • H(I,J,iTime) - Depths in grid, fill index in surf-zone cells {SG}
  • Hmax - Max.(ie. most negative) depth in the surf zone cell (SG)
  • Hmin - Min. depth in the surf zone cell (SG)
  • IMAX - Number of grid cells in the shore parallel direction(SG)
  • JMAX - Number of grid cells in the cross-shore direction(SG)
  • JSHORE(I) - Most landward ocean cell - surf-zone cell(SG)
  • K1 - Scales the diff. sed. transport
  • MFACT - Scales the wave-energy density of general wave climate
  • NFACT - Scales the wave-energy density of the dominant waves
  • PORE - Sediment porosity
  • SANGLE(I) - - Tangent angle along the shoreline {SG}
  • Scr - The critical slope of the upper shoreface cell (JSHORE-1)
  • SHOAL(I) - Relative convergence/div of wave-energy density due to refraction
  • RFACT - Contols the relative ray-bending due to refraction
  • Wo - Scales the wave-drift sed. trans.
  • XSHORE(I) - X-coord. of the continuous shoreline {SG}
  • YSHORE(I) - Y-coord. of the continuous shoreline {SG}
  • YOFF(I,iTime) - offset between the surf-zone cell center and the continuous shoreline (can be positive or negative){SG}
Input format ASCII
Other input format
Describe output parameters time-histories of shoreline positions on a sub-grid scale and the water depths over the gridded portion of the model. Time histories of the inlet cross-section and the areas of bar, channels and tidal flats in the estuary
Output format ASCII
Other output format
Pre-processing software needed? No
Describe pre-processing software
Post-processing software needed? No
Describe post-processing software
Visualization software needed? No
If above answer is yes
Other visualization software

Describe processes represented by the model Time- and length-averaged sediment transport in shelf, shoreface and surf zone environments combined with morphodynamic-driven sediment flux through inlet, along ebb tide delta and with the bay or estuar.
Describe key physical parameters and equations These are described in the extensive comments within the fortran program.
Describe length scale and resolution constraints Typical applications involve coastal systems tens to hundreds of kilometers in extent. Very useful when there are many components in the coastal system. Although the gridded portion of the model usually use delta x and y values on the order of 100s of meters there is a sub-grid scale representation of the shoreline position with resolution of meters.
Describe time scale and resolution constraints Averaging time is on the order of annual averages so that individual storm events are not represented. Problems usually are scaled for years, to decades all the way up to millenia.
Describe any numerical limitations and issues Probably more than we know but none come to mind.

Describe available calibration data sets Like most morphodynamical models the user is to supply long-term coastal change data from measured data.
Upload calibration data sets if available:
Describe available test data sets Several papers have been published that can be used in comparison tests (simply Google Niedoroda)
Upload test data sets if available:
Describe ideal data for testing User supplied time history of shoreline and depth changes over time with supporting long records of short-term wave and current measurements.

Do you have current or future plans for collaborating with other researchers? This model continues to evolve. The users are encouraged to replace subroutine with very simplified representations of physics (eg. wave refraction and shoaling) with superior codes. They are requested to pass these back to the authors for inclusion in the new version. Similar requests are made of those using the model for interesting teaching situations.

This model will form a basis of the SL-PR model now funded for development and use with coastal response to sea level rise problems.

Is there a manual available? No
Upload manual if available:
Model website if any
Model forum / discussion board
Comments This model is actively under development as of the spring of 2009.

This part will be filled out by CSDMS staff

OpenMI compliant No but possible
BMI compliant No but possible
WMT component No but possible
PyMT component
Can be coupled with:
Model info
Alan Niedoroda
Stive, Wang
Citation indices CSt ASMITA
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Citation indices CSt ASMITA
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Output Files