Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction (2011) / Chapter Skim
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28 CHAPTER 4. SCOUR CONDITIONS One method for classifying abutment scour depends on abutment location in a channel, the relative erodibilities of sediments forming the main-channel bed and soils forming the floodplain (see Figure 2-10)
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29 Figure 4-1. Abutment-scour conditions: Scour Condition A - hydraulic scour of the main channel bed causes bank failure, which causes a failure of the face of the abutment embankment (a)
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30 The three scour conditions may occur also for wing-wall abutments. However, a couple of additional erosion processes can result in failure of the main-channel bank and the approach embankment: 1.
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31 Figure 4-2. Field example of Scour Condition A
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32 Figure 4-4. Field example of Scour Condition C for a wing-wall abutment.
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33 the approach embankment. This scour mechanism differs from those discussed in Chapter 4, and is less common; 3.
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