Model:CSt ASMITA

Cst ASMITA

Cst ASMITA Questionnaire

Contact Information

Model:	CSt_ASMITA
Contact person:	Alan Niedoroda (Model developer)
Institute:	URS Corporation-Tallahassee Office
City:	Tallahassee, Florida
Country:	USA
Email:	alan_niedoroda@urscorp.com
2nd person involved:	Marcel Stive (Model developer)
3rd person involved:	Z.B. Wang (Model developer)

Model Description

Model type:

Model for the coastal and marine domain.

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.

Technical information

Supported platforms:	Windows
Programming language:	Fortran77
Model development started at:	2000 and development still takes place.
To what degree will the model become available:	The model is available as source code, teaching tool and as executable (Well documented code is meant to be read by users)
Current license type:	GPLv2
Memory requirements:	Ordinary PC or laptop
Typical run time:	minutes

Input / Output description

Input 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. coef.in 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. coef.in 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
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
Post-processing software (if needed):	User defined
Visualization software (if needed):	No

Process description

Processes represented by 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.
Key physical parameters & equations:	These are described in the extensive comments within the fortran program.
Length scale & 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.
Time scale & 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.
Numerical limitations and issues :	Probably more than we know but none come to mind.

Testing

Available calibration data sets:	Like most morphodynamical models the user is to supply long-term coastal change data from measured data.
Available test data sets:	Several papers have been published that can be used in comparison tests (simply Google Niedoroda)
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.

User groups

Currently or plans for collaborating with:

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.

Documentation

Key papers of the model:	Niedoroda, A. W., C. W. Reed, H. Das, J. Koch, J. Donoghue, Z. Wang and M. Stive. “Modeling Large-scale Morphodynamics of Complex Coastal Systems”. Coastal Sediments ’03, ASCE, 5th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes Clearwater, Florida. (2003): 14 pps. Niedoroda, A. W., C. W. Reed, M. Stive and P. Cowell. “Numerical Simulations of Coastal-tract Morphodynamics.” Coastal Dynamics 2001, ASCE 4th Conference on Coastal Dynamics (2001): 403-412. Niedoroda A., C. W. Reed, D. J. Swift, H. Arato and K. Hoyanagi. “Modeling Shore-normal Large-scale Coastal Evolution.” Marine Geology. 126 (1995): 181-199.19. Niedoroda, A. W., Reed, C. W., Das, H., Fagherazzi, S., Donoghue, J., and Cattaneo, A. “Analysis of a Large-scale Depositional Clinoformal Wedge along the Italian Adriatic coast.” Marine Geology 222-223 (2005): 179-192. Cowell, P., M. Stive, A. W. Niedoroda, H. de Vriend, D. J. Swift, G. Kaminsky and M. Capobianco. “The Coastal-tract (Part 1): A Conceptual Approach to Aggregated Modeling of Low-order Coastal Change.” J. Coastal Res. 19.4 (2003): 812-827. Cowell, P, M. Stive, A. W. Niedoroda, D. J. Swift, H. de Vriend, M. Buijsman, R. Nicholls, P. Roy, G. Kaminsky, J. Cleveringa, C. W. Reed and P. de Boer. “The Coastal-tract (Part 2): Applications of Aggregated Modeling of Lower-order Coastal Change”. J. Coastal Res. 19.4 (2003): 828-848.
Is there a manual available:	no
Model website if any:	--

Additional comments

Comments:

This model is actively under development as of the spring of 2009.