IMPROVED FLOW THROUGH BRIDGE WATERWAYS BY ENTRANCE ROUNDING

As part of a larger study of the hydraulics of single-span arch bridges, the improvement to the waterway flow that can be obtained by rounding the entrance of the opening has been investigated in the laboratory using hydraulic models. Both curved and chamfered entrances to bridges with arched and rectangular waterways have been evaluated. It was found that a rounded entrance was usually superior to a chamfer. The improvement in discharge or reduction in afflux that can be obtained in channel flow is often less than 5%, but increases quickly and becomes significant once the waterway is submerged. At high stages almost any form of rounding is beneficial and provides an effective means of increasing the hydraulic efficiency of a bridge. (A)

• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • HAMILL, L
• Conference:
  • PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS: MUNICIPAL ENGINEER
• Publication Date: 1997-3

Language

• English

Media Info

• Features: References;
• Pagination: p. 7-21
• Serial:
  • Volume: 121
  • Issue Number: 1

Subject/Index Terms

• TRT Terms: Arch bridges; Flow; Hydraulic properties; Hydrologic phenomena; Intersection elements; Mathematical models; Scale models; Shape; Structural models; Water
• Uncontrolled Terms: Entrances
• Geographic Terms: United Kingdom
• ITRD Terms: 3427: Arch bridge; 4323: Discharge (flow); 426: Entrance; 4748: Hydraulic properties; 6473: Mathematical model; 6205: Model (not math); 9073: Shape; 8119: United Kingdom; 4355: Water
• Subject Areas: Bridges and other structures; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00738262
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jul 30 1997 12:00AM