Model help:RecircFeed: Difference between revisions
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| Ntimes | | Ntimes | ||
| total number of sets in a run | | total number of sets in a run | ||
| - | |||
|- | |||
| f | |||
| backwater number | |||
| - | |||
|- | |||
| e | |||
| initial dimensionless mean bed elevation | |||
| m | |||
|- | |||
| T | |||
| ratio of normal to critical Shield stress | |||
| - | |||
|- | |||
| S | |||
| initial normalized slope | |||
| - | |||
|- | |||
| t | |||
| dimensionless time step | |||
| - | |||
|- | |||
| p | |||
| number of prints | |||
| - | |||
|- | |||
| i | |||
| number of iterations per print | |||
| - | |||
|- | |||
| x | |||
| dimensionless downstream coordinate | |||
| - | |||
|- | |||
| η | |||
| dimensionless bed elevation | |||
| - | |||
|- | |||
| Sl | |||
| bed slope | |||
| - | |||
|- | |||
| q<sub>bT</sub> | |||
| dimensionless bedload transport | |||
| - | |||
|- | |||
| H | |||
| dimensionless water depth | |||
| - | |||
|- | |||
| SNup | |||
| upstream end normalized slope | |||
| - | |||
|- | |||
| SNdown | |||
| downstream end normalized slope | |||
| - | | - | ||
|- | |- | ||
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==Notes== | ==Notes== | ||
This program is meant for use with laboratory flumes, and allows the user to choose either a recirculating flume or a feed flume. | |||
The inputted Froude number must be less than 1 (i.e. the flow is assumed to be subcritical); if it is not the program will alert the user and automatically quit. | |||
In the outputs file, the normalized slopes upstream and downstream are below the dimensionless eta values, scroll down to find them. | |||
At equilibrium the ratio between the bed slope and the slope at normal flow will both equal 1 | |||
==Examples== | ==Examples== | ||
Revision as of 11:52, 2 May 2011
RecircFeed
This provide a calculator for approach to equilibrium in recirculating and feed flumes
Model introduction
This program provides two modules for studying the approach to mobile-bed normal equilibrium in recirculating and sediment-feed flumes containing uniform sediment.
The module "Recirc" implements a calculation for the case of a flume that recirculates water and sediment. The module "Feed" implements a calculation for the case of flume which receives water and sediment feed.
Model parameters
Uses ports
This will be something that the CSDMS facility will add
Provides ports
This will be something that the CSDMS facility will add
Main equations
A list of the key equations. HTML format is supported; latex format will be supported in the future
| Symbol | Description | Unit |
|---|---|---|
| Fro | Froude number at normal mobile-bed equilibrium | - |
| nt | exponent in the sediment transport relation | - |
| FI | dimensionless flume number describing the ratio of normal flow depth to the elevation drop across the flume at normal flow | - |
| ηtilinit | initial value of the dimensionless mean bed elevation (used only in the case of sediment feed) | - |
| τr | geometric standard deviations | - |
| SNI | initial scaled bed slope (ratio of initial bed slope to bed slope at normal flow) | - |
| M | number of spatial intervals in the reach | - |
| dt | dimensionless time step | - |
| Nstep | total number of time steps in a set | - |
| Ntimes | total number of sets in a run | - |
| f | backwater number | - |
| e | initial dimensionless mean bed elevation | m |
| T | ratio of normal to critical Shield stress | - |
| S | initial normalized slope | - |
| t | dimensionless time step | - |
| p | number of prints | - |
| i | number of iterations per print | - |
| x | dimensionless downstream coordinate | - |
| η | dimensionless bed elevation | - |
| Sl | bed slope | - |
| qbT | dimensionless bedload transport | - |
| H | dimensionless water depth | - |
| SNup | upstream end normalized slope | - |
| SNdown | downstream end normalized slope | - |
Notes
This program is meant for use with laboratory flumes, and allows the user to choose either a recirculating flume or a feed flume.
The inputted Froude number must be less than 1 (i.e. the flow is assumed to be subcritical); if it is not the program will alert the user and automatically quit.
In the outputs file, the normalized slopes upstream and downstream are below the dimensionless eta values, scroll down to find them.
At equilibrium the ratio between the bed slope and the slope at normal flow will both equal 1
Examples
An example run with input parameters, BLD files, as well as a figure / movie of the output
Follow the next steps to include images / movies of simulations:
- Upload file: http://csdms.colorado.edu/wiki/Special:Upload
- Create link to the file on your page: [[Image:<file name>]].
See also: Help:Images or Help:Movies
Developer(s)
References
Key papers
