CMS

The Coastal Modeling System

The Coastal Modeling System (CMS) has been a research and development area of The Coastal Inlets Research Program (CIRP) at the United States Army Corps of Engineers - Engineering Research and Development Center (USACE-ERDC), Coastal and Hydraulics Laboratory (CHL) since 2006. It was built from a group of numerical models that have been under development since 2002. Information on the CIRP and publications on the CMS can be found at the CIRP Website.

The CMS is designed for practical applications in navigation channel performance and sediment management for coastal inlets and adjacent beaches in order to improve the usage of Operation and Maintenance Funds. The CMS is intended as a research and engineering tool that can be used by novice and experienced modelers on desk-top computers and can be also run in parallel using OpenMP. The CMS takes advantage of the Surface-water Modeling System (SMS) interface for grid generation and model setup, as well as plotting and post-processing.

System Components

• CMS-Flow

CMS-Flow is a coupled hydrodynamic and sediment transport model capable of simating depth-averaged or three-dimensional circulation, salinity and sediment transport and morphology change due to tides, wind and wave driven currents, and includes the Coriolis force, wind stress, bottom friction, and wave radiation stresses. The CMS-Flow sovles the governing equations using the Finite Volume Method on a non-uniform cartesian grid. For additional information click here.

• CMS-Wave

The CMS-Wave is a spectral wave transformation model and solves the steady-state wave-action balance equation on a non-uniform Cartesian grid. It considers wind wave generation and growth, diffraction, reflection, dissipation due to bottom friction, whitecapping and breaking, wave-wave and wave-current interactions, wave runup, wave setup, and wave transmission through structures.

For additional information on each component of the CMS select one of the links below:

• CMS-Wave
• CMS-PTM

Steering

In order to combine the capabilities of the two main numeric engines of Flow and Waves, the user must pass information from one engine to the other. In the case of CMS-Flow, this means reading in wave data from CMS-Wave. Information passed to CMS-Flow includes reading radiation stress gradients that directly impact currents (wave driven currents) and height fields, wave directions and breaking data which enter into the sediment transport rate formulations. In the case of CMS-Wave, the option exists to read in currents and simulate their transformation by the current. For either situation, the data fields must be interpolated onto the native domain (interpolate wave data onto the flow grid and/or flow data onto the wave grid).

This may be done interactively using the tools in SMS. However, it is much more efficient to read or define simulations for both engines, and invoke the steering module from the Data menu. This tool runs the engines separately, but interpolates the output and passes it to the other engine automatically.

External Links:

• US Army Engineer Research and Development Center - Ongoing Research [1]
• Presentations
  • Coastal Modeling System (CMS) for Integrated Calculation of Waves, Flow, Sediment Transport, and Morphology Change [2]
  • Introduction to CMS-Wave [3]
  • Additional information on CMS-Flow capabilities [4]
  • CMS-Wave Demonstrations to Louisiana (Levees & Muddy coast) [5]
  • Future of the CMS [6]

• Aug 2008 Two-Dimensional Depth-Averaged Circulation Model CMS-M2D: Version 3.0, Report 2, Sediment Transport and Morphology Change [7]

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