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TUFLOW 2D Hydraulic Structures: Difference between revisions

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What is the recommended method for representing a railway ballast area in TUFLOW?
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Unfortunately, we have no data beyond the ends.
* hB/T ratios of less than 2 represent a very unusual bridge sitting low to the ground, and the peak FLC may increase above the end value (FLC of 0.42) in a way that doesn't follow the research trend or extrapolation. For these cases we would recommend using CFD modelling to obtain a more informed value. Alternatively, computing an FLC based on pressure flow might be considered.
* For hB/T ratios of greater than 6, the FLC is likely to continue to decrease, but probably not significantly. Clamping to the end value (FLC of 0.20) might be considered the more conservative approach (if the primary concern is flood levels upstream of the bridge).<br>
 
== What is the recommended method for representing a railway ballast area in TUFLOW? ==
The recommended approach to representing a railway ballast area in TUFLOW is to model it as a soil layer with high infiltration and high hydraulic conductivity (both horizontal and vertical).
 
Define the soil layer thickness
 
* Set the bottom elevation of the soil layer approximately 1m below the surface to ensure it has a consistent thickness.
* Modify the soil elevation under the rail embankment
 
Adjust the soil layer to create a flat surface beneath the embankment.
 
* Use GIS layers to define the base elevation in this area.
 
* Ensure the elevation points align correctly with the embankment shape.
 
Specify the soil type
 
* Assign a distinct soil type to the embankment area using a polygon.
 
* Differentiate it from the surrounding soil types for better representation.<br>
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