RIVERBANK STABILITY ANALYSIS. II: APPLICATIONS

Bank retreat occurs by a combination of lateral erosion by the flow and mass failure under gravity. A new analysis of bank erosion and failure is developed, using a critical shear-stress concept to account for lateral erosion and a slope stability criterion for mass failure. In this paper, we apply the analysis to two problems of bank retreat often encountered by practicing engineers dealing with alluvial channels. The first application is to the prediction of degradation downstream of a dam for the case in which bed lowering causes bank instability. We show that rapid bank retreat can occur once the threshold height for mass failure of the banks is reached. This supplies sediment to the flow, tends to limit the depth of degradation, and drives complex response downstream. The second application is to the modeling of flow in channel bends and the prediction of the equilibrium cross section. We show that scour depth at the other bank may be limited by the critical bank height. If scouring causes the outer bank to fail, then the channel will migrate laterally rather than scour down vertically. The analysis presented here can be used to predict the equilibrium cross section and migration rate incorporating bank stability considerations. It could also be used to predict the likely increase in scour depth resulting from outer bank stabilization in a bendway.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8672558
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Thorne, C R
  • Osman, A M
• Publication Date: 1988-2

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 151-172
• Serial:
  • Journal of Hydraulic Engineering
  • Volume: 114
  • Issue Number: 2
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9429
  • Serial URL: https://ascelibrary.org/journal/jhend8

Subject/Index Terms

• TRT Terms: Cohesive soils; Cross sections; Depth; Equilibrium (Mechanics); Erosion; Failure; Flow; Highway curves; Scour; Shear stress; Stability analysis; Streambeds
• Uncontrolled Terms: Degradation; Lateral loads
• Old TRIS Terms: Bends; Channels; River beds
• Subject Areas: Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00468182
• Record Type: Publication
• Report/Paper Numbers: ASCE Paper 22171
• Files: TRIS
• Created Date: Apr 30 1988 12:00AM