Model:Caesar

Caesar

Also known as
Model type	Modular
Model part of larger framework
Note on status model
Date note status model

Spatial dimensions
Spatial extent
Model domain	Terrestrial
One-line model description	Cellular landscape evolution model
Extended model description	CAESAR is a cellular landscape evolution model, with an emphasis on fluvial processes, including flow routing, multi grainsize sediment transport. It models morphological change in river catchments.

Keywords:	landscape evolution,

Supported platforms	Linux, Windows
Other platform
Programming language	C
Other program language	C#
Code optimized
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	1996
Does model development still take place?	Yes
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)	Through web repository
Source web address	http://www.coulthard.org.uk/downloads/visualcaesar.htm
Source csdms web address
Program license type	Other
Program license type other	GNU
Memory requirements	>512MB
Typical run time	5 min to 50 days

Describe input parameters	DEM as ascii grid (output from arcGIS), Rainfall data as a space separated ascii file (straightforward list), Inputs of water/sediment in an ascii file. Other single value parameter inputs for grainsize, flow parameters, slope processes etc..
Input format	ASCII
Other input format
Describe output parameters	ascii grids (readable into arcGIS) and google earth images of: DEM, flow depth, surface grainsize, shear stress, vegetation cover, velocity. Also time series of water discharge and sediment discharge (across 9 grainsizes) at user chosen interval. Also visual output to AVI file.
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	2d multiple flow direction steady state flow model Erosion and deposition over 9 separate grainsizes Bedload and suspended load sediment transport Slope processes (creep, enhanced creep and mass movement) Vegetation growth Aeolian transport (under development - slab dune model)
Describe key physical parameters and equations	Flow depths calculated using version of mannings implemented across a cellular grid using a scanning algorithm. Sediment tranport using either Einstein or Wilcock and Crowe functions Slope model using simple slab failure and psuedo USLE implementation Dune model adaption of DECAL and Werner slab model
Describe length scale and resolution constraints	Has been applied to catchments ranging from 1km^2 to 500km^2, at grid resolutions ranging from 1m to 50m.
Describe time scale and resolution constraints	The model has simulated periods from 1 day to 9000 years. The length of run is largely contingent on the number of grid cells, thus a balance between resoltion and area of study. A small catchment with a coarse resolution will run very fast. Increase the area or make grid cells smaller and run times will increase.
Describe any numerical limitations and issues	Run times can be long (60 +days for large areas over many 100's of years). Flow model is steady state

Describe available calibration data sets	Tested on several catchments in UK over long and short time scales.
Upload calibration data sets if available:
Describe available test data sets	none yet; in development
Upload test data sets if available:
Describe ideal data for testing	Flow and sediment discharge data, images of topographic change

Do you have current or future plans for collaborating with other researchers?	Yes, I am happy to collaborate with any potential users. There is a long history of CAESAR being take up by others including researchers in Italy, France, Spain, NZ, Australia, USA.

Is there a manual available?	Yes
Upload manual if available:
Model website if any	http://www.coulthard.org.uk
Model forum / discussion board

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Featured publication(s)	Year	Model described	Type of Reference	Citations
Van De Wiel, Marco J.; Coulthard, Tom J.; Macklin, Mark G.; Lewin, John; 2007. Embedding reach-scale fluvial dynamics within the CAESAR cellular automaton landscape evolution model. Geomorphology, 90, 283–301. 10.1016/j.geomorph.2006.10.024 (View/edit entry)	2007	Caesar	Model overview	153
Coulthard, Tom J.; Neal, Jeff C.; Bates, Paul D.; Ramirez, Jorge; de Almeida, Gustavo A. M.; Hancock, Greg R.; 2013. Integrating the LISFLOOD-FP 2D hydrodynamic model with the CAESAR model: implications for modelling landscape evolution. Earth Surface Processes and Landforms, 38, 1897–1906. 10.1002/esp.3478 (View/edit entry)	2013	CAESAR Lisflood Caesar	Model overview	190
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