Model:TopoFlow-Channels-Diffusive Wave: Difference between revisions
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{{Input - Output description | {{Input - Output description | ||
|Describe input parameters=****** THERE | |Describe input parameters=****** THERE SEEMS TO BE A BUG IN THE FORM HERE ******* | ||
These inputs must be provided as grids: | These inputs must be provided as grids: | ||
*flow_codes = D8 flow codes (Jenson 1984 convention), | *flow_codes = D8 flow codes (Jenson 1984 convention), | ||
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ADD ADDITIONAL, OUTPUT OPTIONS HERE. | ADD ADDITIONAL, OUTPUT OPTIONS HERE. | ||
|Input format=ASCII, Binary | |Input format=ASCII, Binary | ||
|Describe output parameters=This component computes the following variables, as grids: | |Describe output parameters=****** THERE SEEMS TO BE A BUG IN THE FORM HERE ******* | ||
This component computes the following variables, as grids: | |||
*Q = discharge [m^3/s] | *Q = discharge [m^3/s] | ||
*u = flow velocity [m/s] | *u = flow velocity [m/s] | ||
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{{Process description model | {{Process description model | ||
|Describe processes represented by the model=The diffusive wave method for flow routing in the channels of a D8-based river network. | |Describe processes represented by the model=The diffusive wave method for flow routing in the channels of a D8-based river network. | ||
|Describe key physical parameters and equations=****** THERE | |Describe key physical parameters and equations=****** THERE SEEMS TO BE A BUG IN THE FORM HERE ******* | ||
Main equations used by this component: | Main equations used by this component: | ||
ΔV(i,t)= Δt * [ R(i,t) Δx Δy - Q(i,t) + Σk Q(k,t) ] = change in water volume [m^3], mass conservation | ΔV(i,t)= Δt * [ R(i,t) Δx Δy - Q(i,t) + Σk Q(k,t) ] = change in water volume [m^3], mass conservation | ||
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(Source: TopoFlow HTML Help System) | (Source: TopoFlow HTML Help System) | ||
|Describe length scale and resolution constraints=Recommended grid cell size is around 100 meters, but can be parameterized to run with a wide range of grid cell sizes. DEM grid dimensions are typically less than 1000 columns by 1000 rows. | |Describe length scale and resolution constraints=Recommended grid cell size is around 100 meters, but can be parameterized to run with a wide range of grid cell sizes. DEM grid dimensions are typically less than 1000 columns by 1000 rows. | ||
|Describe time scale and resolution constraints=The basic stability condition is: dt < (dx / u_min), where dt is the timestp, dx is the grid cell size and u_min is the smallest velocity in the grid. This ensures that flow cannot cross a grid cell in less than one time step. Typical timesteps are on the order of seconds to minutes. Model can be run for a full year or longer, if necessary. | |Describe time scale and resolution constraints=The basic stability condition is: dt < (dx / u_min), where dt is the timestp, dx is the grid cell size and u_min is the smallest velocity in the grid. This ensures that flow cannot cross a grid cell in less than one time step. Typical timesteps are on the order of seconds to minutes. Model can be run for a full year or longer, if necessary. |
Revision as of 01:02, 16 February 2010
Contact
Name | Scott Peckham |
Type of contact | Model developer |
Institute / Organization | CSDMS, INSTAAR, University of Colorado |
Postal address 1 | 1560 30th street |
Postal address 2 | |
Town / City | Boulder |
Postal code | 80305 |
State | Colorado |
Country | USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property. |
Email address | Scott.Peckham@colorado.edu |
Phone | 303-492-6752 |
Fax |
TopoFlow-Channels-Diffusive Wave
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