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Aeration Performance of Triangular‐Notch Weirs
Author(s) -
Baylar A.,
Bagatur T,
Tuna A.
Publication year - 2001
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.2001.tb00334.x
Subject(s) - weir , aeration , hydraulic structure , turbulence , environmental science , flow (mathematics) , hydrology (agriculture) , mechanics , geotechnical engineering , geology , engineering , physics , geography , waste management , cartography
Hydraulic structures have an impact on the concentration of dissolved oxygen in a river system, even though the water is in contact with the structure for only a short period of time. The same oxygen transfer that would normally occur over several kilometres in a river can occur at a single hydraulic structure, because the flow over a structure is typically highly turbulent, resulting in increased interfacial renewal. Plunging overfall jets from weirs are a good example of this fact, and the aeration properties of such structures have been studied widely in the laboratory and field over a number of years. This technical note (a) describes triangular‐notch weirs having a different weir angle α and how they affect aeration performance, and (b) demonstrates that aeration efficiency decreases with increasing weir angle.