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

Abstract

[1] 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 plume, the extent of which is on the same lateral scale as the horizontal dislocations generated by persistent first-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.

Discovery of a natural CO2seep in the German North Sea: Implications for shallow dissolved gas and seep detection

“…The density of the plume water is, however, slightly altered because of the increased concentrations of dissolved CO 2 (increases density) or CH 4 (decreases density), and is accounted for in the state equations. Modifying a well‐established bubble plume model [ Wüest et al , 1992; McGinnis et al , 2004], we investigate the behavior of both CO 2 and CH 4 driven bubble plumes.…”

“…The plume model theory and assumptions are detailed by Wüest et al [1992], with the key variables and the associated six simultaneous differential equations given in Table 2 and the range of input values listed in Table 3. The following overview of the model is summarized from McGinnis et al [2004] and Wüest et al [1992]. The model is based on horizontally integrated equations for conservation of mass, momentum, heat, salinity and gases [ McDougall , 1978].…”

Bubble plume modelling with new functional relationships

“…However, it is relevant in bubble plume applications related to deep lakes and reservoirs (e.g. Wüest et al 1992, McGinnis et al 2004.…”

“…1). These plumes are used for many environmental engineering applications , McGinnis et al 2004, Lima Neto et al 2008a, 2008b, 2008c.…”

3-D Numerical Investigation on Oxygen Transfer in a Horizontal Venturi Flow with Two Holes

“…A lower value usually causes a serious environmental issue for a body of water, including decreasing the capacity of creatures living within it to grow, reproduce, and survive [1]. To improve DO concentration in lakes and rivers and prevent water quality deterioration, aeration is commonly used [2][3][4]. As a simple device, the Venturi meter is widely applied in industrial applications to control the flow rate of fluids.…”