Model:Caesar

Caesar

Model type:	Modular model for the terrestrial domain.
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.

Supported platforms:	Linux, Windows
Programming language:	C, C#
Model development started at:	1996 and is still going on
To what degree will the model become available:	Source code will be available, and model can be used as well as a teaching tool and executable will be available.
Current license type:	GNU
Memory requirements:	>512MB
Typical run time:	5 min to 50 days

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
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
Post-processing software (if needed):	no
Visualization software (if needed):	no: but you can use ESRI (ArcGIS)

Processes represented by 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)
Key physical parameters & 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
Length scale & resolution constraints:	Has been applied to catchments ranging from 1km^2 to 500km^2, at grid resolutions ranging from 1m to 50m.
Time scale & 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.
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

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

Currently or plans for collaborating with:	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.

Key papers of the model:	Van De Wiel, M.J., Coulthard, T.J., Macklin, M.G., Lewin, J. (2007) Embedding reach-scale fluvial dynamics within the CAESAR cellular automaton landscape evolution model. Geomorphology, 90 (3-4), pp. 283-301. Coulthard, T. J. Macklin, M. G. & Kirkby, M. J. (2002) Simulating upland river catchment and alluvial fan evolution. Earth Surface Processes and Landforms. 27, 269-288.
Is there a manual available:	yes
Model website if any:	http://www.coulthard.org.uk

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