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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Managing deltas : Bubble plume towed in salt-stratified water
Bubble plume towed in salt-stratified water
Author : ROB UITTENBOGAARD(1), JOHN CORNELISSE(2), SCOTT SOCOLOFSKY(3) & YANN FRIOCOURT(4)
ABSTRACT
This paper reports on a part of our research on the application of bubble plumes for reducing the intrusion of seawater in
a 15m deep salt-stratified tidal channel (the Rotterdam Waterway in The Netherlands). We set the relevant prototype
conditions at 15m depth, 1.5 m/s maximum current and 1 psu/m maximum salt-stratification.
The prime objective of this part of our research is to determine the efficiency of converting (air-compressor) energy into
increasing the potential energy of a salt-stratified current under prototype conditions, e.g., reducing the stratification by
mixing.
In stagnant density-stratified water, the vertical transport of water by bubble plumes has been explored, although mostly
at small laboratory scales. Estimates for the energy efficiency of the bubble plume for upward transport and mixing of
denser water in stagnant density-stratified water are presented in (Zic et al., 1990; Lemckert & Imberger, 1992; Asaeda
& Imberger,1993; Socolofsky & Adams 2003).
For the first time we explored the essential properties of a bubble plume in a salt-stratified current by the equivalent case
of a bubble plume towed through stagnant water salt-stratified at 10 psu/m. We ran laboratory experiments at 0.7m
water depth in a canal at Texas A&M and at 2.5m water depth in Deltares¡¯ 50m long water-soil tank; the bubble plume
was towed up to 0.4 m/s. From the change in density profile per tow run we derive the vertical salt-mass transport of the
bubble plume as well as the efficiency of converting the energy provided by expanding bubbles into potential energy of
density-stratified water. In addition, by using 4 different camera viewing directions, by dye injection in front of the plume
at several different depth levels, as well as, by velocity recordings we observed the plume angle, the plume¡¯s non-circular
cross section when towed, and the flow pattern around the plume
File Size : 1,409,577 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Managing deltas
Date Published : 19/08/2015
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