TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions
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For example, the image below could be represented as a rectangular shaped screen located upstream or downstream of a culvert, modelled as a short zero length RF (rectangular culvert with fixed losses) channel using a 1d_nwk GIS layer.
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[[File:Trash_screen_schematic.png|alt=|300x300px]]
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== How can fishway baffles in a culvert be modelled? ==
<span style="color:red; font-weight:bold;">UNDER CONSTRUCTION</span>
Fishway baffles are barriers inside a culvert that slow the water and help fish swim through.
These approaches could be used to represent them inside a model:
* Short culvert with smaller opening.
** A short culvert section is added with its bottom and top levels set to match the fish baffle. The width is set to the total width of the fish passage gaps. This represents the reduced space for water to pass through.
* Two culverts in a row.
** Two culverts are connected in series. The first is the normal culvert, and the second is a very short culvert with a smaller opening sized to the fish baffle gaps.
For both options, sensitivity testing is recommended because at low flows the way the culvert is defined can change the results. These methods do not include turbulence or detailed 3D water movement around the baffles. If accurate fish passage flows are required, a CFD (3D) model can be used to determine the flows and those flows can then be applied using a 1D Q type channel.{{Tips Navigation
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