Collaborative Research: Mixing and Circulation in a Buoyant Coastal Plume

合作研究：漂浮的沿海羽流中的混合和循环

• 批准号: 0220446
• 负责人: Richard Garvine
• 金额: --
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0220446&HistoricalAwards=false
• 关键词: Collaborative; Research; Mixing; Circulation; Buoyant

0220446 GarvineMixing and circulation in the Delaware Coastal Current (DCC), a buoyant coastal jet, will be studied using a combination of numerical modeling and field work (moorings, rapid surveys, and purposeful dye releases) followed by analysis and interpretation of results from the two approaches. Working hypotheses are that mixing between the coastal buoyant discharge and ambient shelf waters is larger during upwelling than downwelling events, that this mixing during upwelling is primarily concentrated at the offshore plume boundary, and that the conservation of buoyancy is principally a balance between horizontal advection and vertical diffusion. Moorings will include standard current meters and bottom-mounted acoustic Doppler current profilers (ADCPs). There will be 5 moorings, three parallel to the DCC and three perpendicular. Multiple conductivity-temperature-depth recorders (CTDs) and temperature sensors will also be deployed on both taut and slack moorings. At the northernmost mooring, two ADCPs will allow estimation of the Reynolds stresses using Stacey's method. ADCP bin spacing will be 0.5 m allowing resolution of 1m eddies. Forty-five kilograms of Rhodamine dye will be released during each upwelling or downwelling event selected for study. This dye will be traced for 4-5 days. There will be two cruises and mooring deployments. One upwelling dye study will occur during year 1 and one upwelling and one downwelling experiment during year two. A previously utilized version of ECOM3d, configured for the DCC, will be used to analyze the dye study results. Significant effort will be devoted to comparing different turbulent closure schemes. After the model is calibrated, it may be used for sensitivity studies. Careful comparison and interpretation of field and model results will conclude the study.

0220446在特拉华州沿海电流（DCC）的GarvineMix和循环（一种浮力的沿海喷气机）将使用数值建模和现场工作（摩尔河，快速调查和有目的的染料释放）的组合进行研究，然后对两种方法的分析和解释进行分析和解释。 工作假设是，在上升过程中，沿海浮力排放和环境架子水之间的混合比下降事件要大，因此上升过程中的这种混合主要集中在近海羽界，而浮力的保护主要是水平对流和垂直扩散之间的平衡。 系泊设备将包括标准的电流仪表和底部安装的声学多普勒电流剖面厂（ADCP）。 将有5个系泊设备，三个平行于DCC和3个垂直线。 多个电导率 - 温度深度记录器（CTD）和温度传感器也将在绷紧和松弛的系泊上部署。 在最北端的系泊期，两个ADCP将允许使用Stacey的方法估算雷诺应力。 ADCP箱间距将为0.5 m，允许分辨率为1M涡流。 在选择进行研究的每个上升或下降事件期间，将释放45公斤的若丹明染料。 该染料将被追溯4-5天。 将有两次巡游和系泊部署。 一项上升的染料研究将在1年级进行，而在第二年则进行了一项上升的染料研究。 为DCC配置的先前使用的ECOM3D版本将用于分析染料研究结果。 重大努力将致力于比较不同的湍流闭合方案。 校准模型后，它可用于灵敏度研究。 仔细的比较和模型结果将得出结论。