Please use this identifier to cite or link to this item:
https://hdl.handle.net/11681/13151
Title: | Depth-averaged numerical modeling for curved channels |
Authors: | Bernard, Robert S. Schneider, Michael L. (Michael Lee) |
Keywords: | Bendway Numerical model Open channel Secondary flow Turbulence Velocity distribution Hydraulics Hydrodynamics Mathematical models Secondary flow correction STREMR (computer program) |
Publisher: | Hydraulics Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
Series/Report no.: | Technical report (U.S. Army Engineer Waterways Experiment Station) ; HL-92-9. |
Description: | Technical Report Abstract: Without some correction for the interaction between lateral curvature and vertically nonuniform velocity, depth-averaged numerical models cannot predict the gradual migration of high velocity toward the outside of channel bends. Conventional depth-averaging does not account for the curvature-induced secondary flow that gives rise to the migration. To remedy this deficiency, a secondary flow correction (SFC) has been developed and incorporated in the two-dimensional STREMR code. The secondary governing equation contains two empirical coefficients, and these have been adjusted to make STREMR predictions agree with observed velocity profiles for a single 270-deg bend. Without further adjustment, the SFC yields comparable accuracy for multiple-bend predictions in two other channels with depth, curvature, and bottom friction different from the 270-deg case. This suggests that the SFC may be useful in general for bendways with small curvature, gentle side slope, and moderate bottom friction. |
Rights: | Approved for public release; distribution is unlimited. |
URI: | http://hdl.handle.net/11681/13151 |
Appears in Collections: | Technical Report |
Files in This Item:
File | Description | Size | Format | |
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TR-HL-92-9.pdf | 2.12 MB | Adobe PDF | View/Open |