AERATION PERFORMANCE OF RECTANGULAR PLANFORM LABYRINTH WEIRS

Maintenance of a high level of dissolved oxygen is important in natural rivers and in some water treatment processes. This can be enhanced by creating turbulence in the water. One method of producing such turbulence is via the overflow jets downstream of weir structures. The aeration characteristics of straight weirs have been measured and analyzed by a number of investigators. However, labyrinth weirs, which are cranked in planform, have received little attention in this respect. The aeration performance of a weir under a particular set of flow conditions is largely determined by the characteristics of the overall jet. The geometry of labyrinth weirs provides increased sill length and often results in the overfall jets colliding with each other, both of which may lead to increased aeration. A series of laboratory experiments were run on rectangular planform labyrinth weirs. These showed that, although detailed geometry of the weir was not important, the labyrinth weirs aerated significantly better than an equivalent straight weir, particularly at low drop heights.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8675387
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Wormleaton, P R
  • Tsang, C C
• Publication Date: 2000-5

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 456-465
• Serial:
  • Journal of Environmental Engineering
  • Volume: 126
  • Issue Number: 5
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9372
  • Serial URL: http://ojps.aip.org/eeo

Subject/Index Terms

• TRT Terms: Aeration; Dissolved gases; Experiments; Geometry; Laboratory tests; Oxygen; Pollution control; Rectangles; Rivers; Turbulence; Water pollution; Weirs
• Uncontrolled Terms: Labyrinth weirs; Planform
• Subject Areas: Environment; Marine Transportation;

Filing Info

• Accession Number: 00794058
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 23 2000 12:00AM