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...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 2000-05, Vol.126 (5), p.456-465
Main Authors: Wormleaton, Peter R, Tsang, Chau Chiu
Format: Article
Language:English
Subjects:
Aeration
Applied sciences
Dissolution
Earth sciences
Earth, ocean, space
Environment
Environmental engineering
Equivalence
Exact sciences and technology
Freshwater
Geochemistry
Height
Hydrology
Hydrology. Hydrogeology
Jets
Maintenance
Mineralogy
Oxygen
Pollution
Rivers
Sewerage works: sewers, sewage treatment plants, outfalls
Silicates
TECHNICAL PAPERS
Turbulence
Water geochemistry
Water treatment
Water treatment and pollution
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Summary: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.
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)0733-9372(2000)126:5(456)