INVESTIGATION OF SCOUR AT SELECTED BRIDGE CROSSINGS IN ALASKA

SCOUR WAS STUDIED AT A BRIDGE ON THE KNIK RIVER, ALASKA, DURING THIS PERIOD. AN INSIGNIFICANT AMOUNT OF SCOUR, BOTH GENERAL AND LOCAL, OCCURRED DURING THE PEAK FLOW OF THE RIVER AT THE NEW HIGHWAY CROSSING. IT WAS DETERMINED THAT: (1) THERE IS NO NEED TO INSTRUMENT A BRIDGE PIER TO MEASURE LOCAL SCOUR, (2) IF THE STREAM IS SUITABLE FOR USE OF A BOAT, MAGNITUDE OF SCOUR CAN BE DETERMINED WITH A BOAT- MOUNTED TRANSDUCER AND RECORDING FATHOMETER, AND (3) IF A BOAT CANNOT BE USED, SOUNDINGS CAN BE MADE WITH A BOOM AND A SOUNDING WEIGHT OR A TRANSDUCER WHICH IS INCORPORATED INTO A SOUNDING WEIGHT AND SUSPENDED BELOW THE WATER SURFACE. IT IS SUGGESTED THAT A NETWORK OF BRIDGE SITES BE ESTABLISHED FOR FLOOD-SCOUR SURVEILLANCE THAT ARE WIDELY LOCATED TO INCREASE THE LIKELIHOOD OF EXPERIENCING A FLOOD. DATA COLLECTED OVER A WIDE RANGE OF CONDITIONS SHOULD ALLOW THE VERIFICATION OF EXPERIMENT RESULTS OF SCOUR OBTAINED BY LABORATORY STUDIES UNDER CONTROLLED CONDITIONS.

• Supplemental Notes:
  • Progress RePT, 28 PP, 18 FIG
• Corporate Authors:

  Department of the Interior

  1849 C Street, NW
  Washington, DC  United States  20240

  U.S. Geological Survey

  F Street Between 18th and 19th Street, NW
  Washington, DC    20244
• Authors:
  • Leveen, L S
• Publication Date: 1967-4

Subject/Index Terms

• TRT Terms: Boats; Bridge abutments; Bridge piers; Data collection; Depth; Highway bridges; Laboratory studies; Rivers; Scour; Sounding; Transducers
• Old TRIS Terms: Depth indicators; Discharge rate
• Subject Areas: Bridges and other structures; Highways; Hydraulics and Hydrology; Marine Transportation;

Filing Info

• Accession Number: 00208352
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 8 1994 12:00AM