Journal of Japan Society on Water Environment
Online ISSN : 1881-3690
Print ISSN : 0916-8958
ISSN-L : 0916-8958
Technical Report
Field Experiment in Forced Water Circulation of Shallow Layer by Advanced Submergible Aerator in Reservoir (Visualization of Directly Destructed Thermocline and Examination of Effect of Air-Opening Configuration on Water Entrainment)
Yuji IWAMATSUAkinori NAKATAKiminori KOSAKATomonobu SATOMasataka YAMAGISHI
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2014 Volume 37 Issue 2 Pages 63-70

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Abstract
In Hiyoshi Reservoir (Kyoto Prefecture, Japan), two submergible aerators were installed in 1997 and have been used for the elimination of the anaerobic layer in the deep reservoir. In 2009, one of these aerators was modified as a trial, to circulate water in the shallow layer of the reservoir, so as to release spent air (oxygen-poor air) from the top of the aerator into the shallow layer. As a performance evaluation test, a field study of shallow layer circulation was conducted during the summer in 2010, under the condition of a strong thermocline existing at a depth of around 5 m. In the field test, water temperature distribution was measured within a 20 m radius around the aerator and at water depths of 0 to 20 m, during both the operation and idling of the aerator. Secondly, the velocity distribution of radial flow was measured around the aerator to clarify the water entrainment due to the air plume. As a result, it was confirmed that the thermocline was destroyed within a 10-13 m radius during operation, a horizontal cold flow (intrusion) was observed at the depth of the bottom, a cold dome resulted from thermocline destruction, and a newly developed air parcel shredder enhanced the water entrainment effect.
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© 2014 Japan Society on Water Environment
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