Forum | Bed Undulation Problems

You are in the forum topic » Bed Undulation Problems

If this is your first visit, be sure to check out the forum rules. You need to register and be logged in before you can post. Go to the forum area 'Model build ' or to the 'top level forum'

Quickview

Author

Thread

srakumar

Member

Location:
Registered: 13/01/2009

Bed Undulation Problems
Has anyone got the modelling experience of very undulating bed with big differences in elevations of around 10m up and down between the cross sections. This pertains to a estuary model where there are localised deep sections along the lenth of the river. Even the interpolated sections are also not helping to run the steady state model!. Any ideas on how to deal with the very undulating geometry between the cross sections.

14/10/2009 16:39

Link - Ip: Logged - Quote:

jonny

Member

Location:
Registered: 13/01/2009 Warnings: 0

You should try inserting narrow slots (pilot channels)with a base level at a constant grade between the undulations, or section of undulating bed.

The slots do not need to be more than 2cm wide and will therefore have a negligible impact on the river hydraulics.

hope this helps

15/10/2009 07:12

Link - Ip: Logged - Quote:

chrisw

Member

Location:
Registered: 13/01/2009 Warnings: 0

I'm not sure that I would leap to the narrow slot option as my first try.

I would make sure that the differences between sections were realistic and consistent with the steady flow (and downstream boundary) that you wish to solve for. In some estuaries there never would be a steady flow throughout the whole reach so you have to be sure that the model you are proposing is physically realistic. For such big variations in bed level you probably need a large minimum water level at the downstream boundary and probably also a large inflow at the upstream boundary. Ideally the upstream boundary would be located upstream of the tidal limit.

26/10/2009 12:09

Link - Ip: Logged - Quote:

Quick reply

You need to login before you can post.
If you are not registered on the site, register here.

Latest forum posts

» increasing dflood causes ...
» ISIS Mapper for TUFLOW ...
» Blockage unit
» Back flow at downstream ...
» ISIS v3.4 - Images not ...
» Importing Survey/Cross ...
» Importing Survey/Cross ...
» Blockage
» Orifice Linearisation ...
» ISIS Version 3.4 Beta

Forum topic area

You are in the forum topic » Bed Undulation Problems

Latest forum posts

Quick search

RSS Forum Feed