Model:Area-Slope Equation Calculator: Difference between revisions

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== Area-Slope Equation Calculator ==
==Introduction==
__TOC__


===Introduction===
== History ==


=== History ===
== Papers ==


=== Papers ===
== Issues ==


=== Area-Slope Equation Calculator Questionnaire ===
== Help ==


==== Contact Information ====
== Input Files ==


{| class="wikitable"
== Output Files ==
| class="model_col1"| Model:
| class="model_col2"| Area-Slope Equation Calculator
|-
| class="model_col1"| Contact person:
| class="model_col2"| Sagy Cohen (Model developer)
|-
| class="model_col1"| Institute:
| class="model_col2"| The University of Newcastle
|-
| class="model_col1"| City:
| class="model_col2"| Callaghan
|-
| class="model_col1"| Country:
| class="model_col2"| Australia
|-
| class="model_col1"| Email:
| class="model_col2"| sagy.cohen@newcastle.edu.au
|-
| class="model_col1"| 2nd person involved:
| class="model_col2"| Garry Willgoose (Model developer)
|-
| class="model_col1"| 3rd person involved:
| class="model_col2"| Greg Hancock (Model developer)
|-
|}


==== Model Description ====
== Download ==


{| class="wikitable" 
== Source ==
| class="model_col1"| Model type:
| class="model_col2"| Modular model for the Hydrological domain.
|-
| class="model_col1"| Description:
| class="model_col2"| 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 ====
 
{| class="wikitable" 
| class="model_col1"| Supported platforms:
| class="model_col2"| Windows
|-
| class="model_col1"| Programming language:
| class="model_col2"| Matlab
|-
| class="model_col1"| Model development started at:
| class="model_col2"| 2006 and ended in 2009.
|-
| class="model_col1"| To what degree will the model become available:
| class="model_col2"| An executable will be available
|-
| class="model_col1"| Current license type:
| class="model_col2"| --
|-
| class="model_col1"| Memory requirements:
| class="model_col2"| --
|-
| class="model_col1"| Typical run time:
| class="model_col2"| Minutes
|}
 
==== Input / Output description ====
 
{| class="wikitable"
| class="model_col1"| Input parameters:
| class="model_col2"| Three input maps at ESRI ASCII format:
# Flow Direction (ArcGIS format);
# Contributing Area (Flow Accumulation-ArcGIS format);
# Slope (ArcGIS format);
|-
| class="model_col1"| Input format:
| class="model_col2"| ASCII
|-
| class="model_col1"| Output parameters:
| class="model_col2"| Two output maps ESRI ASCII format:
# Alpha (coefficient);
# Constant.
|-
| class="model_col1"| Output format:
| class="model_col2"| ASCII
|-
| class="model_col1"| Post-processing software (if needed):
| class="model_col2"| Yes, ArcGIS or other to convert ASCII output to map.
 
|-
| class="model_col1"| Visualization software (if needed):
| class="model_col2"| Yes, ESRI, Matlab.
|}
 
==== Process description ====
 
{| class="wikitable"
| class="model_col1"| Processes represented by model:
| class="model_col2"| Extract c and alpha from:<br>
Slope=cArea^alpha<br>
For more details:<br>
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.
|-
| class="model_col1"| Key physical parameters & equations:
| class="model_col2"| --
|-
| class="model_col1"| Length scale & resolution constraints:
| class="model_col2"| Computer memory
|-
| class="model_col1"| Time scale & resolution constraints:
| class="model_col2"| --
|-
| class="model_col1"| Numerical limitations and issues :
| class="model_col2"| Artificially limit the alpha values between 2 and -2 and the constant values between 0 and 2.<br>
Done so to avoid extreme outliers.
|}
 
==== Testing ====
 
{| class="wikitable"
| class="model_col1"| Available calibration data sets:
| class="model_col2"| 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.
|-
| class="model_col1"| Available test data sets:
| class="model_col2"| Demo data included. 107x127 pixels catchment.
|-
| class="model_col1"| Ideal data for testing:
| class="model_col2"| Reasonable relief catchment.
|}
 
==== User groups ====
 
{| class="wikitable"
| class="model_col1"| Currently or plans for collaborating with:
| class="model_col2"| --
|}
 
==== Documentation ====
 
{| class="wikitable"
| class="model_col1"| Key papers of the model:
| class="model_col2"| 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.
|-
| class="model_col1"| Is there a manual available:
| class="model_col2"| No
|-
| class="model_col1"| Model website if any:
| class="model_col2"| --
|}
 
==== Additional comments ====
 
{| class="wikitable"
| class="model_col1"| Comments:
| class="model_col2"| --
|}
 
=== Issues ===
 
=== Help ===
 
=== Input Files ===
 
=== Output Files ===
 
=== Download ===
 
=== Source ===


[[Category:Hydrology]]
[[Category:Hydrology]]

Revision as of 09:11, 15 September 2009

Contact

Name Sagy Cohen
Type of contact Model developer
Institute / Organization The University of Newcastle
Postal address 1
Postal address 2
Town / City Callaghan
Postal code 2308
State NO STATE
Country Australia
Email address sagy.cohen@newcastle.edu.au
Phone
Fax


Name Garry Willgoose
Type of contact Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax


Name Greg Hancock
Type of contact Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
Country
Email address
Phone
Fax



Area-Slope Equation Calculator


Metadata

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:
  1. Flow Direction (ArcGIS format);
  2. Contributing Area (Flow Accumulation-ArcGIS format);
  3. Slope (ArcGIS format);
Input format ASCII
Other input format
Describe output parameters Two output maps ESRI ASCII format:
  1. Alpha (coefficient);
  2. 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


Introduction

History

Papers

Issues

Help

Input Files

Output Files

Download

Source

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