SCOUR AT BRIDGE WATERWAYS

THIS IS THE FIFTH IN A SERIES OF NCHRP REPORTS DESIGNED TO COLLECT, ANALYZE, AND SYNTHESIZE SCATTERED INFORMATION ON A SINGLE PROBLEM OF BROAD INTEREST. IN 1969 A STUDY WAS MADE OF EXISTING PRACTICES AND LITERATURE AND MORE THAN 100 ORGANIZATIONS WERE SURVEYED TO DETERMINE PRESENT METHODS OF DEALING WITH THE PROBLEM OF DISPLACEMENT OF STREAM BED MATERIAL BY STREAM OR TIDAL CURRENTS OCCURRING NATURALLY, AS A RESULT OF CHANNEL CONSTRUCTION, OR FROM CHANGES IN THE FLOW PATTERN. (ORDINARILY THE GREATEST SCOUR OCCURS DURING THE LARGEST FLOODS.) TWO TYPES OF SCOUR---THE CLEAR-WATER CASE IN WHICH MATERIAL IS REMOVED FROM THE SCOUR HOLE AND NOT REPLACED, AND THE SEDIMENT-TRANSPORTING CASE IN WHICH THE SCOUR HOLE IS CONTINUOUSLY SUPPLIED WITH MATERIAL FROM THE SEDIMENT LOAD CARRIED IN THE STREAM BED---ARE DIFFERENTIATED, AND METHODS OF ESTIMATING SCOUR FOR EACH CASE ARE REVIEWED. MEASURES ARE DISCUSSED FOR COMBATTING SCOUR IN PREDESIGN STUDIES, DESIGN, CONSTRUCTION, AND REPAIR. PARTICULAR ATTENTION IS GIVEN TO MEANS OF PREDICTING SCOUR AND ASSIGNING RISK FACTORS. A SELECTED BIBLIOGRAPHY OF 58 REFERENCES IS APPENDED, AS IS A LIST OF THE RESEARCH, ENGINEERING, RAILROAD, AND HIGHWAY ORGANIZATIONS THAT RESPONDED TO THE QUESTIONNAIRE ON WHICH THE REPORT IS BASED.

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    • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Rept No 5, 37 PP, 16 FIG, 4 TAB, 5 APP
  • Publication Date: 1970

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  • Media Type: Digital/other
  • Pagination: 37p
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    Open Access (libre)

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  • Accession Number: 00204323
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Jul 12 1971 12:00AM