Model help:BackwaterWrightParker
BackwaterWrightParker
This is used to calculate backwater curves in sand-bed streams, including the effects of both skin friction and form drag due to skin friction.
Model introduction
This program calculates backwater curves over a sand-bed stream with a specified spatially constant bed slope S. The calculation uses the hydraulic resistance formulation of Wright and Parker (2004) (but without the flow stratification correction).
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 |
|---|---|---|
| Qww | flow discharge | m3 / s |
| B | channel width | m |
| D50 | median size of bed sediment | mm |
| D90 | size of bed sediment such that 90% is finer | mm |
| Rr | submerged specific gravity of sediment | - |
| S | bed slope | - |
| xid | downstream water surface elevation | m |
| L | reach length | m |
| M | number of spatial intervals |
Output
| Symbol | Description | Unit |
|---|---|---|
| x | downstream distance | m |
| η | bed elevation | m |
| xi | water surface elevation | m |
| H | flow depth | m |
| Hs | flow depth due to skin friction | m |
Notes
Note on input parameters: xid may take any value as long as the downstream Froude number < 1. The program cannot compute supercritical curves.
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
- Wright, S. and G. Parker, 2004, Flow resistance and suspended load in sand-bed rivers: simplified stratification model, Journal of Hydraulic Engineering, 130(8), 796-805.
Links
Any link, eg. to the model questionnaire, etc.
