SCOUR AT A SUBMERGED ROCK DIKE, WILLAPA BAY, WASHINGTON

This paper describes scour at a submerged rock structure on the coast of Washington. The SR-105 Emergency Stabilization Project was constructed in the summer of 1998 to protect a stretch of state highway from destruction because of shore erosion. The structure consists of a rubble-mound groin and dike. The rock groin extends approximately 1,600 ft from the shore. A submerged rock dike at the end of the groin functions in part as toe protection. The dike structure is 500 ft long at the crest and is built from 157,000 cu yd of rock placed by bottom dump barge. The rock structure has induced relocation of a deep tidal channel 500 to 2000 ft further from the shore. The project performs as expected and reduces erosion along an extremely erosive shoreline northwest of the project site. Scour has developed in the vicinity of the toe of the structure. This scour was expected and the design incorporates a "launched-toe" feature to accommodate the predicted scour. Monitoring since construction shows that the structure has maintained its integrity. However, maintenance may be necessary should the scour continue and a maintenance concept design has been developed.

• Supplemental Notes:
  • The proceedings are available on CD-ROM.
• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011
• Authors:
  • Sultan, N
  • Phillips, R
  • Bermudez, H
• Conference:
  • First International Conference on Scour of Foundations
  • Location: College Station, Texas
  • Date: 2002-11-17 to 2002-11-20
• Publication Date: 2002

Language

• English

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 719-733

Subject/Index Terms

• TRT Terms: Countermeasures; Dikes; Erosion control; Groins (Hydraulics); Maintenance; Monitoring; Scour; Shore protection
• Geographic Terms: Willapa Bay (Washington)
• Subject Areas: Bridges and other structures; Design; Highways; Hydraulics and Hydrology; Maintenance and Preservation; Marine Transportation; Safety and Human Factors; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00977055
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 5 2004 12:00AM