Model:Area-Slope Equation Calculator

Contact

Name	Sagy Cohen
Type of contact	Model developer
Institute / Organization	The University of Newcastle
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Town / City	Callaghan
Postal code	2308
State	NO STATE
Country	Australia
Email address	sagy.cohen@newcastle.edu.au
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Fax

Name	Garry Willgoose
Type of contact	Model developer
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Name	Greg Hancock
Type of contact	Model developer
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Area-Slope Equation Calculator

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Summary Also known as Model type Modular Model part of larger framework Note on status model Date note status model Technical specs Supported platforms Windows Other platform Programming language Matlab Other program language Code optimized Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2006 Does model development still take place? No If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As executable"As executable" is not in the list (As code, As teaching tool) of allowed values for the "Model availability" property. Source code availability (Or provide future intension) Source web address Source csdms web address Program license type Other Program license type other -- Memory requirements -- Typical run time Minutes In/Output Describe input parameters Three input maps at ESRI ASCII format: Flow Direction (ArcGIS format); Contributing Area (Flow Accumulation-ArcGIS format); Slope (ArcGIS format); Input format ASCII Other input format Describe output parameters Two output maps ESRI ASCII format: Alpha (coefficient); Constant. Output format ASCII Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? Yes Describe post-processing software ArcGIS or other to convert ASCII output to map. Visualization software needed? Yes If above answer is yes ESRI, Matlab Other visualization software Process Describe processes represented by the model Extract c and alpha from: Slope=cArea^alpha For more details: Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820. Describe key physical parameters and equations -- Describe length scale and resolution constraints Computer memory. Describe time scale and resolution constraints -- Describe any numerical limitations and issues Artificially limit the alpha values between 2 and -2 and the constant values between 0 and 2. Done so to avoid extreme outliers. Testing Describe available calibration data sets Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820. Upload calibration data sets if available: Describe available test data sets Demo data included. 107x127 pixels catchment. Upload test data sets if available: Describe ideal data for testing Reasonable relief catchment. Other Do you have current or future plans for collaborating with other researchers? -- Is there a manual available? No Upload manual if available: Model website if any Model forum / discussion board Comments Area-Slope Equation Calculator Introduction History Papers Area-Slope Equation Calculator Questionnaire Contact Information Model: Area-Slope Equation Calculator Contact person: Sagy Cohen (Model developer) Institute: The University of Newcastle City: Callaghan Country: Australia Email: sagy.cohen@newcastle.edu.au 2nd person involved: Garry Willgoose (Model developer) 3rd person involved: Greg Hancock (Model developer) Model Description Model type: Modular model for the Hydrological domain. Description: Traditionally the Area-Slope equation (S=cA^alpha) is extracted from a catchment area vs. slope plot. This model calculate the Area-Slope constant and coefficient (alpha) for each pixel at the catchment as a function of its downslope neighbor. Technical information Supported platforms: Windows Programming language: Matlab Model development started at: 2006 and ended in 2009. To what degree will the model become available: An executable will be available Current license type: -- Memory requirements: -- Typical run time: Minutes Input / Output description Input parameters: Three input maps at ESRI ASCII format: Flow Direction (ArcGIS format); Contributing Area (Flow Accumulation-ArcGIS format); Slope (ArcGIS format); Input format: ASCII Output parameters: Two output maps ESRI ASCII format: Alpha (coefficient); Constant. Output format: ASCII Post-processing software (if needed): Yes, ArcGIS or other to convert ASCII output to map. Visualization software (if needed): Yes, ESRI, Matlab. Process description Processes represented by model: Extract c and alpha from: Slope=cArea^alpha For more details: Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820. Key physical parameters & equations: -- Length scale & resolution constraints: Computer memory Time scale & resolution constraints: -- Numerical limitations and issues : Artificially limit the alpha values between 2 and -2 and the constant values between 0 and 2. Done so to avoid extreme outliers. Testing Available calibration data sets: Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820. Available test data sets: Demo data included. 107x127 pixels catchment. Ideal data for testing: Reasonable relief catchment. User groups Currently or plans for collaborating with: -- Documentation Key papers of the model: Cohen, S., G. Willgoose, and G. Hancock (2008), A methodology for calculating the spatial distribution of the area-slope equation and the hypsometric integral within a catchment, J. Geophys. Res., 113, F03027, doi:10.1029/2007JF000820. Is there a manual available: No Model website if any: -- Additional comments Comments: -- Issues Help Input Files Output Files Download Source