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sigaskell

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About sigaskell

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  1. Has anyone attempted to model the effect that floating vessels may have on flow dynamics in 2D? I am dealing with an estuarine river site with permanent docks alongside the banks. There are large (>20 m wide, >150 m in length) barge vessels and ships frequently docked through the project reach and the draft of these boats would ordinarily reduce the depth of the river in the dock area by 50%. I am modelling in 2D so one thought I have had would be to incorporate a geometry modification whereby the depth of water is reduced to that between the keel of the boats and the river bed. However, I also wonder if I need to account for the fact that there would likely be greater drag underneath these boats than would otherwise occur with a reduced depth (i.e. because underneath the boat there would be drag from both the hull and the river bed rather than drag only at the river bed if there was open air above). This would be accounted for by increasing Manning's roughness slightly. Any thoughts, research or feedback would be greatly appreciated. Thanks!
  2. I have a project where I am looking to map shear stresses through a reach of river in 2D. Available bathymetry for the river does not extend much more than 300 m upstream of the section of river that I am interested in (the river is approximately 400 m wide and 10 - 20 m deep) and obtaining more data for the upstream part of the river is not going to be possible due to cost constraints. The model would be run under bankfull conditions (no bank overtopping). Is there any research or general pointers anyone can give me about how to test how reasonable the results would be with such a short distance from the upstream BC to the area of interest?
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