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Publication Number:  FHWA-HRT-17-013     Date:  February 2017
Publication Number: FHWA-HRT-17-013
Date: February 2017

 

Hydraulic Performance of Shallow Foundations for The Support of Vertical-Wall Bridge Abutments

APPENDIX B. EQUILIBRIUM SCOUR MAPS FROM THE PHYSICAL EXPERIMENTS

This appendix contains graphical representations of scour depth maps from the physical experiments.

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is in the center of the channel between the abutments and downstream of the contraction, with a scoured area downstream of the contraction. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 100. Graphic. Run 1—HEC-23 DG 14 for bridge abutments.

 

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is throughout the center of the channel between the abutments and downstream of the contraction abutments, with a scoured area downstream of the contraction. Upstream of the contraction the scour is more rounded than is apparent from run 3. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 101. Graphic. Run 2—HEC-23 DG 18 for bottomless culverts.

 

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is in the channel adjacent to the abutments, with the scour hole wrapping around the upstream and downstream corners of the abutments. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 102. Graphic. Run 3—Field installation with riprap side sloped against abutment wall.

 

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is in the channel adjacent to the abutments with the scour hole wrapping around the upstream and downstream corners of the abutments. The scour holes are wider and deeper than for run 3. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 103. Graphic. Run 4—Riprap side sloped against abutment wall with WR= y0.

 

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is in the channel adjacent to the abutments and downstream of the contracted section with the scour hole wrapping around the upstream and downstream corners of the abutments. The scour holes are shallower than for run 3. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 104. Graphic. Run 5—Flush apron level with channel bed with WR= y0.

 

This is the plan view of the digitized equilibrium scour map. Scour near the abutments has been limited by the riprap apron. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 105. Graphic. Run 6—Proposed buried full bridge opening width with W1/W2=1.55.

 

This is the plan view of the digitized equilibrium scour map. Deepest scour is in the center of the channel between the abutments and upstream of the contraction. Significant mounding of sediment has occurred downstream of the opening. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 106. Graphic. Run 7—No riprap apron with W1/W2 = 4.1.

 

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is in the center of the channel between the abutments and upstream of the contraction, but is limited by the level buried riprap apron. Significant mounding of sediment has occurred downstream of the opening. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 107. Graphic. Run 8—Proposed buried full bridge opening width with W1/W2 = 4.1.

 

This figure is the plan view of the digitized equilibrium scour map. Deep scour is in the center of the channel between the abutments, but is limited by the riprap, which, in this case, slopes down toward the center of the channel. Downstream of the contraction scour is slightly deeper.
1 inch = 2.54 mm.
Figure 108. Graphic. Run 9—Proposed buried full bridge opening width with W1/W2 = 4.1.

 

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is in the center of the channel between the abutments and upstream of the contraction. Significant mounding of sediment has occurred downstream of the opening. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 109. Graphic. Run 10—No riprap apron with W1/W2 = 4 and a 30-degree skew angle.

 

This figure is the plan view of the digitized equilibrium scour map. Deepest scour is in the center of the channel between the abutments and upstream of the contraction, but is limited by the riprap apron. Significant mounding of sediment has occurred downstream of the opening. (1 inch = 2.54 mm.)
1 inch = 2.54 mm.
Figure 110. Graphic. Run 11—Proposed buried full bridge opening width with W1/W2 = 4.1 and a 30‑degree skew angle.

 

 

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