Coastal Modeling System

Background

An Advanced Engineering Tool

The Coastal Modeling System is an integrated suite of numerical models for simulating flow, waves, sediment transport, and morphology change in coastal areas. The system 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 USACE Operation and Maintenance Funds. The CMS is intended as a research and engineering tool that can be used on desk-top computers. 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.

• Background

The 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.

• Key Features

• Fully integrated system

1. CMS-Flow - Inline flow, sediment and salinity model
2. CMS-Wave - Spectral wave transformation model

• Finite Volume Method - Mass conservative
• Non-uniform Cartesian Grid - Easy to setup and run
• Telescoping Cartesian Grid - Flexible, efficient, and easier to generate than unstructured meshes
• Supports most common types of forcing and boundary conditions
• Robust numerical schemes for reliable, crash-free simulations
• Parallelization on desktop computers for fast computation
• User-friendly interface

System Components

• CMS-Flow

CMS-Flow is a coupled hydrodynamic and sediment transport model capable of simating depth-averaged circulation, salinity and sediment transport due to tides, wind and waves. The hydrodynamic model sovles the conservative form of the shallow water equations and includes terms for the Coriolis force, wind stress, wave stress, bottom stress, vegetation flow drag, bottom and friction, and turbulent diffusion. There are three sediment transport models available in CMS: a sediment mass balance model, an equilibrium advection diffusion model, and non-equilibrium advection-diffusion model. The salinity transport is simulated with the standard advection diffusion model and includes evaporation and precipitaion. All equations are solved using the Finite Volume Method on a non-uniform Cartesian grid. For additional information on CMS-Flow visit CMS-Flow Main Page.

• 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 information on CMS-Wave visit CMS-Wave Main Page.

CMS User Manual

An updated Coastal Modeling System User Manual has recently been published by the ERDC Library. The user manual contains comprehensive information on model theory, model setup, and model features. The detailed descriptions include creation of a new project, configuration of model grid, various types of boundary conditions, representation of coastal structures, numerical methods, and coupled simulations of waves, hydrodynamics, and sediment transport. Pre- and post-model data processing and CMS modeling procedures are also described through operation within a graphic user interface — the Surface-water Modeling System.

The User's Manual can be found here.

Documentation Portal

Technical Documentation CMS-Flow Grid Angle Conventions Vertical Coordinate System Hydrodynamics Variable Definitions Governing Equations Bed Shear Stresses Eddy Viscosity Wind and Atmospheric Pressure Wave Flux Velocity Boundary Conditions Numerical Methods Sediment Transport Equilibrium Total Load Equilibrium Bed load plus AD Suspended load Total load Non-equilibrium Sediment Transport Equilibrium Concentrations and Transport Rates Sediment Fall Velocity Hiding and Exposure Incipient Motion Ripple Dimensions Numerical Methods Morphology Acceleration Factor Salinity Transport Numerical Methods Structures Surface Roller Governing Equations Roller Stresses Numerical Methods CMS-Wave Grid Angle Conventions Governing Equations Wave Breaking Diffraction Wave Generation Wave-current interaction Wave-wave interaction Wave radiation stresses Coupling of CMS-Flow and CMS-Wave

User Guide Getting Started CMS Tutorials Related SMS Tutorials Frequently Asked Questions CMS-Flow Files CMS-Flow Input files CMS-Flow Output files Advanced_Cards Hydrodynamics Geospatial Information Model Parameters Boundary Conditions Bottom and Wall Friction Eddy Viscosity Atmospheric Forcing Wave Forcing Sediment Transport Total Load Equilibrium Sediment Transport Equilibrium Bed Load Plus AD Suspended Load Total load Non-equilibrium Sediment Transport Hard Bottom Variable D50 Dataset Multiple-sized Sediment Transport (Advanced) Salinity Transport Boundary Conditions Initial Condition Structures Rubble Mounds Weirs Culverts Tide Gates Surface Roller Dredge Module Other Features List of Dataset Units CMS-Wave Grid Generation Model Parameters Input Spectra Structures Other Features CMS-Wave File Formats CMS-Flow and CMS-Wave Model Coupling

Examples, applications and more Test Cases V & V Test Cases from TR Proposed New VV/UQ Test Cases Other Test Cases Applications Previous Projects Current Projects Useful links Glossary References Goodness-of-Fit Statistics User Group Workshops New Orleans CMS/CPT Workshop 2010 Downloads CMS Releases CMS User Manual Utilities CMS Tips/Techniques Tidal Databases ADCIRC Databases ENPAC 2015 (US Eastern North Pacific Tidal Constituent) Database - 573 MB zipped ECGOM 2015 (US Atlantic/Gulf of Mexico Tidal Constituent) Database - 2.0 GB zipped LeProvost Tidal Constituent Database LeProvost Database Working on CMS DMI Advanced Features Sediment Mapping (to be added)

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External Links:

• US Army Engineer Research and Development Center - Ongoing Research [1]
• Coastal Modeling System Fact Sheet [2]

• Presentations (MVN Workshop - June 2009)
  • Coastal Modeling System (CMS) for Integrated Calculation of Waves, Flow, Sediment Transport, and Morphology Change [5]
  • Introduction to CMS-Wave [6]
  • Additional information on CMS-Flow capabilities [7]
  • CMS-Wave Demonstrations to Louisiana (Levees Muddy coast) [8]
  • Future of the CMS [9]

• Aug 2008 Two-Dimensional Depth-Averaged Circulation Model CMS-M2D: Version 3.0, Report 2, Sediment Transport and Morphology Change [10]