Turbulence and Vertical Mixing Phenomena in Stratified Water Areas

Research work concerning vertical mixing processes in stratified water areas is briefly reviewed. Attention is focused on vertical mixing phenomena which are found in the hydraulic engineering field, such as estuaries, lakes, reservoirs, land locked bays, etc. From the view point of the mixing mecha...

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Published inJAPANESE JOURNAL OF MULTIPHASE FLOW Vol. 6; no. 2; pp. 132 - 148
Main Author MICHIOKU, Kohji
Format Journal Article
LanguageEnglish
Japanese
Published Osaka City THE JAPANESE SOCIETY FOR MULTIPHASE FLOW 1992
Japan Science and Technology Agency
Subjects
Entrainment
Hydraulics
Richardsonnumber
Stratified flow
Turbulence structure
Vertical mixing
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Summary:Research work concerning vertical mixing processes in stratified water areas is briefly reviewed. Attention is focused on vertical mixing phenomena which are found in the hydraulic engineering field, such as estuaries, lakes, reservoirs, land locked bays, etc. From the view point of the mixing mechanism, entrainment processes are classified into three categories, i.e., (1) shear induced entrainment (Stype), (2) entrainment due to eddy convection and diffusion in the mechanical stirring fied (DM-type) and (3) entrainment due to thermal convection (DT-type). The turbulence structure and entrainment mechanism for each case are examined and discussed. Experimental and analytical work on entrainment relationships is shown for several types of stratified flow fields among which shear-free turbulence generated by an oscillating grid, stratified shear flows, wind-induced mixing and turbulent penetrative convection are included.
ISSN:0914-2843
1881-5790
DOI:10.3811/jjmf.6.132