Pier scour countermeasures

Riprap is the most commonly employed countermeasure where bridge piers need to be protected against possible undermining by scour. An extensive review of available design techniques revealed a wide range of equations and proposed design procedures but no generally accepted method for riprap sizing and implementation. The aim of this study was to develop a design procedure for riprap protection at piers which can be used in most river environments. The failure mechanisms and stability of riprap layers around cylindrical and rectangular shaped piers were examined in a comprehensive experimental study. The study assessed the importance of various riprap, flow, sediment, and pier parameters. A riprap size prediction formula was developed based on an allowable maximum local scour depth of up to 20 per cent. This equation has been incorporated in a design approach which was tested through a model study of the Hutt Estuary Bridge. (a) A thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy.

• Corporate Authors:

  University of Auckland

  Private Bag
  Auckland 1,   New Zealand 
• Authors:
  • Lauchlan, C
• Publication Date: 1999

Language

• English

Media Info

• Pagination: 1 VOL (VARIOUS PAGINGS)

Subject/Index Terms

• TRT Terms: Bridge piers; Bridges; Design; Erosion; Maintenance; Mathematical models; Prevention; Rivers; Soil mechanics; Structures
• ITRD Terms: 3455: Bridge; 3434: Bridge pier; 9011: Design (overall design); 3355: Engineering structure; 5275: Erosion; 1088: Inland waterway; 3847: Maintenance; 6473: Mathematical model; 9149: Prevention; 5755: Soil mechanics
• Subject Areas: Bridges and other structures; Design; Geotechnology; Maintenance and Preservation; Security and Emergencies; I24: Design of Bridges and Retaining Walls; I42: Soil Mechanics; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 01095207
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, ATRI
• Created Date: Apr 25 2008 8:47AM