Bridge Abutment Scour in Compound Channels

by Bruce W. Melville, Auckland Univ, Auckland, New Zealand,
Robert Ettema, Auckland Univ, Auckland, New Zealand,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Experiments are reported which quantify the effect of channel geometry on local scour at abutments for bridges crossing compound river channels. The channel geometry effects are represented by a multiplying factor (KG). It is shown that KG, 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. For design prediction, an expression for the equivalent length of abutment in a compound channel is proposed.

Subject Headings: Bridge abutments | Bridge design | Stream channels | River crossing | Cross sections | Hydraulic roughness | Floods | Hydrologic data

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