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Response of Bed Shear Stress in Open-Channel Flow to a Sudden Change in Bed Roughness [Brief]
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2024-10-01
[PDF-516.82 KB]
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Edition:Research Brief
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Abstract:Sudden changes in bed roughness can occur in many situations in open-channel flows. These changes can occur naturally in a river or stream due to sediment sorting or near a river crossing from that of the original riverbed to that of the riprap protection and vice versa. In the laboratory, a flume with a smooth bottom can abruptly change to a sediment bed in the test section where sediment erosion is being studied. In these situations, the response of flow characteristics, such as turbulence intensity and bed shear stress, to the roughness transition has an engineering interest and needs to be understood. An improved understanding of these factors will lead to enhanced designs for highway infrastructure components such as culverts and bridge abutments and piers that are better able to withstand stresses and erosion.
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