The author conducted experiments to quantify the effect of channel geometry on local scour at bridge abutments crossing compound river channels. The data apply to abutments that extend into the main channel. A multiplying factor represents the channel geometry effects. This factor, K, has the effect of reducing the scour depth from that in the "corresponding" rectangular channel--that channel which has the same overall width as the compound channel and the same depth as the main channel of the compound section. The author observed as much as threefold reductions in scour depth from that in the corresponding rectangular channel. Also, the multiplying factor, as determined by a simple expression involving the cross-section geometry and roughness of the main and flood channels, is consistent with the experimental data. An expression for the equivalent length of abutment in a compound channel is proposed as well.


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  • Accession Number: 00715315
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 8 1996 12:00AM