Model:Shoreline

Shoreline

Model:	Shoreline
Contact person:	Scott Peckham
Institute:	CSDMS, INSTAAR, University of Colorado
City:	Boulder, CO
Country:	USA
Email:	Scott.Peckham@colorado.edu
2nd person involved:	--
3rd person involved:	--

Model type:	Modular model for the coastal domain.
Description:	Shoreline is a "line model" for modeling the evolution of a coastline as the result of wind/wave-driven longshore sediment transport. It is based on conservation of mass and a semi-empirical sediment transport formula known as the CERC formula. This model was specifically adapted for modeling the evolution of the coastline near Barrow, Alaska.

Supported platforms:	UNIX, Linux, Mac OSX, Windows
Programming language:	IDL
Model development started at:	2003 and was finished in 2007.
To what degree will the model become available:	Source code will be available, and will be available as teaching tool a
Current license type:	Apache public license
Memory requirements:	Standard
Typical run time:	minutes to hours

Input parameters:	Initial coastline curve (array of xy pairs), depth of closure, a time series of wind speeds and angles, sediment grainsize, coastal bluff heights, a variety of configuration flags
Input format:	ASCII
Output parameters:	The new coastline at the end of the simulation is plotted. Results are not currently saved to files.
Output format:	Graphical
Post-processing software (if needed):	No
Visualization software (if needed):	Yes, IDL

Processes represented by model:	(1) Wave properties derived from wind speed, wind angle and equations that describe a "fully-developed" sea state. (2) Longshore sediment transport as modeled by the CERC or Kamphuis formulas. (3) Conservation of mass for sediment. (4) Simple methods to model cross-shore sediment transport.
Key physical parameters & equations:	CERC formula for sediment transport rate (see Komar) Kamphuis formula for sediment transport rate. Conservation of sediment mass.
Length scale & resolution constraints:	Spatial resolution of coastline is typically 1 to 50 meters.
Time scale & resolution constraints:	The model is typically driven by hourly wind data (speed and angle) and models coastal change over a period of 10 to 100 years.
Numerical limitations and issues :	The model cannot yet fully handle complex coastline geometries, such as those that cannot be represented (after rotation) by a single-valued function.

Available calibration data sets:	This model is not calibrated, but uses physically-based (measurable) parameters and measured data for validation. See next box.
Available test data sets:	Model was only used for modeling coastline change in the vicinity of Barrow, Alaska. Hourly wind data from a met station at the Barrow Airport was used to drive the model. High-resolution coastline data digitized from aerial photos by Manley et al. (2006) was used for initial and final coastlines. The latter was used for validation purposes. High-resolution DEMs were also used.
Ideal data for testing:	High-resolution coastal change data, for example, digitized from aerial photography or measured with GPS.

Currently or plans for collaborating with:	Have collaborated somewhat with Brad Murray and Andrew Ashton.

Key papers of the model:	Peckham, S.D. (2009) Modeling longshore transport and coastal erosion due to storms at Barrow, Alaska, to be submitted with model source code to Computers and Geosciences.
Is there a manual available:	no
Model website if any:	no

Comments:	--