REFLECTED WAVES IN LAKE WASHINGTON

SOME PHENOMENA ON THE SHORELINE OF LAKE WASHINGTON HAVE BEEN REPORTED TO BE CAUSED BY WAVES REFLECTED FROM THE EVERGREEN POINT /FLOATING/ BRIDGE. AN EXPLORATORY OR PHASE I STUDY WAS UNDERTAKEN TO ASCERTAIN THE LIMITS OF REFLECTED WAVES AND THEIR FREQUENCY AS RELATED TO WIND SPEED AND DIRECTION. WIND DATA FROM THREE OFFICIAL RECORDING STATIONS WERE UTILIZED TO DETERMINE PROBABLE WIND-WAVE CONDITIONS. FOUR SETS OF AERIAL PHOTOGRAPHS WERE TAKEN UNDER DIFFERENT WIND CONDITIONS FOR THE PURPOSES OF OBTAINING WAVE LENGTHS AND GENERAL PATTERNS. A PORTABLE SENSING UNIT WAS USED TO MEASURE WAVE HEIGHT AND FREQUENCY FROM PIERS EXTENDING INTO THE LAKE FROM SELECTED SHORE LOCATIONS. THESE MEASUREMENTS WERE FOUND TO AGREE FAVORABLY WITH PREDICTIONS FROM STANDARD TECHNIQUES. A 16-MM. MOTION PICTURE FILM WAS TAKEN UNDER A MODERATE WIND CONDITION TO SHOW SOME OF THE TYPICAL PHENOMENA ADJACENT TO THE BRIDGE AND THE SHORELINE. AN ANALYSIS WAS DEVELOPED TO DESCRIBE THE ADVANCE OF A WAVE TRAIN AGAINST A WIND. PREDICTIONS OF THE DECAY WITH DISTANCE OF SUCH A WAVE BASED ON THIS ANALYSIS FIT FIELD OBSERVATIONS QUITE REALISTICALLY. GENERALIZED INTERPRETATIONS WERE MADE FOR THE INTERACTION OF THE REFLECTED WAVES WITH THE SHORELINE AND SHORELINE STRUCTURES. THE POSSIBILITIES OF APPLYING A PNEUMATIC OR HYDRAULIC BREAKWATER TO DISSIPATE THE WAVES AT THE BRIDGE WERE INVESTIGATED IN CONSIDERABLE DETAIL. THE SCARCITY OF KNOWN EXPERIMENTAL DATA FOR THE DEEP WATER WAVES ENCOUNTERED, PRECLUDED A POSITIVE CONCLUSION ON REQUIRED DIMENSIONS WITHOUT TEST DATA. /AUTHOR/

  • Supplemental Notes:
    • Hpr, State HR-253
  • Corporate Authors:

    University of Washington, Seattle

    Seattle, WA  USA  98195
  • Authors:
    • Richey, E P
    • Nece, R E
  • Publication Date: 1966-7

Subject/Index Terms

Filing Info

  • Accession Number: 00203960
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Dec 1 1994 12:00AM