Collaborative Research: Mixing and Circulation in a Buoyant Coastal Plume

0220345 Houghton混合和流通在特拉华州沿海流（DCC），一个浮力沿海射流，将研究使用数值模拟和现场工作（系泊，快速调查，有目的的染料释放）的组合，然后分析和解释的结果，从两种方法。 工作的假设是，沿海浮力排放和周围大陆架沃茨之间的混合是在上升流比下降流事件，这种混合在上升流主要集中在近海羽流边界，浮力的保护主要是水平平流和垂直扩散之间的平衡。 系泊设备将包括标准海流计和海底声学多普勒海流剖面仪。 将有5个系泊处，三个平行于DCC，三个垂直于DCC。 多个电导率-温度-深度记录仪（CTD）和温度传感器也将部署在拉紧和松弛的系泊系统上。 在最北端的系泊处，两个ADCP将允许使用Stacey方法估计雷诺应力。 ADCP面元间距为0.5 m，允许分辨率为1 m涡流。 在选择用于研究的每个上升流或下降流事件期间，将释放45公斤的罗丹明染料。 这种染料将被追踪4-5天。 将有两个巡航和停泊部署。 第1年将进行一项上升流染料研究，第2年将进行一项上升流和一项下降流实验。 将使用之前使用的为DCC配置的ECOM 3d版本分析染料研究结果。 大量的工作将致力于比较不同的湍流封闭方案。 模型校准后，可用于敏感性研究。 仔细比较和解释现场和模型结果将结束研究。

0220345 HoughtonMixing 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.