Interaction between a bubble plume and the near field in a stratified lake

A steady-state bubble-plume model is evaluated using full-scale temperature, salinity and dissolved oxygen data collected in a Swiss Lake. The data revealed a plume-generated near-field environment that differed significantly from the ambient far-field water column properties. A near-field torus of reduced stratification developed around the six plumes, the extent of which is on the same lateral scale as the horizontal dislocations generated by persistent 1st-mode seiching. The plume fallback water was found to penetrate much deeper than expected, thereby maintaining reduced vertical gradients in the near-field torus. The plume entrains a portion of the fallback water leading to short-circuiting, which generates a complex plume-lake interaction and reduces far-field downwelling relative to the upward plume flow. As the integral plume model incorporates the entrainment hypothesis, it is highly sensitive to the near-field environmental conditions. After identifying appropriate near-field boundary conditions, the plume model predictions agree well with the field observations.


Editor(s):
Lee, Joseph H. W.
Lam, K. M.
Published in:
Environmental Hydraulics and Sustainable Water Management, 411-416
Year:
2005
Publisher:
Taylor & Francis Group
ISBN:
0415365465
Keywords:
Note:
04068; 1858 KB
Laboratories:




 Record created 2013-06-28, last modified 2018-04-26


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