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Molecular Tagging Techniques for Stratified Flow: Application to Boundary Mixing

Molecular Tagging Techniques for Stratified Flow: Application to Boundary Mixing
分层流的分子标记技术:在边界混合中的应用
批准号:
1067270
负责人:
Chris Rehmann
金额:
$25.0万
依托单位:
依托单位国家:
美国
项目类别:
Standard Grant
财政年份:
2011
资助国家:
美国
项目状态:
已结题
起止时间:
2011-09-01 至 2015-08-31

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中文摘要
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英文摘要
1067270RehmannThe transport of heat, salt, and contaminants is important to measure and predict in environmental flows. For example, water quality in lakes depends on vertical transport of heat and contaminants, and the transport of heat and salt in the ocean affects the global climate. To improve the measurement and modeling of transport, molecular tagging velocimetry and thermometry (MTV&T), which has been applied successfully in other engineering flows, will be extended for use in stratified flows. The technique will be applied in a laboratory model of mixing driven by internal waves at the boundary of lakes and oceans. Specific objectives of the project are to (1) extend MTV&T to salt-stratified flow, (2) quantify turbulence and mixing generated by long waves, and (3) determine the effect of intermittent forcing on the mixing and transport.The intellectual merit of the proposed research comes from the ability to measure the mixing and turbulence in a boundary layer generated by internal waves in more detail than previously possible; MTV&T will provide two-dimensional fields of velocity, concentration, and flux while avoiding some of the pitfalls of other techniques. The proposed laboratory experiments start with a well-studied case to verify the molecular tagging technique and then extend previous laboratory work to study other factors that are important in interpreting field measurements. Concurrent field measurements will guide the design of the laboratory experiments and test the results from the lab. The proposed work exploits PI Rehmann's experience with measurements and modeling of boundary mixing and PI Hu?s expertise in advanced flow measurement and visualization techniques. The broader impacts include training a graduate student, conducting outreach to schools, and applying molecular tagging methods to stratified flow. The outreach uses the connections that Rehmann and Hu have established with Iowa schools and programs to broaden the participation of underrepresented groups. Also, the proposed project involves the first application of the molecular tagging method to a stratified flow of environmental importance; because previous field measurements have shown that boundary mixing can control the basin-wide vertical transport in lakes and oceans, these experiments will provide valuable information for modeling contaminant transport in the environment. Furthermore, once the proposed work demonstrates the usefulness of molecular tagging for boundary mixing, it can be used in laboratory models of many other stratified flows in the environment.
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Predicting fate and transport of antibiotic resistance genes in streams
  • 批准号:
    2241853
  • 项目类别:
    Standard Grant
  • 资助金额:
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  • 财政年份:
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  • 负责人:
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  • 依托单位:
A Model for Turbulence in Strongly Stratified Natural Flows
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  • 项目类别:
    Standard Grant
  • 资助金额:
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  • 财政年份:
    2010
  • 负责人:
    Chris Rehmann
  • 依托单位:
Transport by Intrusions Generated by Boundary Mixing
  • 批准号:
    0647253
  • 项目类别:
    Standard Grant
  • 资助金额:
    $0.0万
  • 财政年份:
    2007
  • 负责人:
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  • 依托单位:
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  • 项目类别:
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  • 资助金额:
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  • 批准年份:
    2011
  • 负责人:
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