Epsiodic Events and Cross-Margin Transport in the Great Lakes: HF Radar Observations of Currents, Winds and Waves

小行星9726683 将根据以下公告进行研究： 机会（NSF 97 - 38）在五大湖海岸研究。 这项合作研究项目的研究人员来自13个 学术和政府研究机构正在进行 NSF Coastal Ocean Processes（CoOP） NOAA沿海海洋计划。 这个为期5年的研究计划将侧重于以下方面的重要性： 近岸-近海输运的幕式事件及随后的 生态后果。该研究旨在：（1）确定 控制跨边界的流程（近岸到离岸） 生物、化学和地质材料的运输 五大湖的沿海边缘，并2）发展和 测试科学的评估策略，量化， 预测多种应力的影响， 人为的，在五大湖或选定的沿海次区域。 受污染沉积物与上覆层之间的紧密耦合 水存在于湖泊和沿海生态系统中， 沉积物再悬浮。密歇根湖的卫星观测 说明了每年近海-近海 运输，一个10公里宽的羽状再悬浮物质延伸 沿着湖的南岸延伸了沿着200多公里。初步 有证据表明，这一幕式事件可能是主要的 密歇根湖的跨边缘沉积物运输机制。 这种类型的事件会影响地球化学的再循环 重要物质，生态系统响应，跨等深线 五大湖的交通。该计划的结果将是 适用于许多沿海地区的类似事件。 这项全面的跨学科研究将实施一项 综合观测计划和数值模拟工作， 确定、量化和开发冬春季再悬浮事件的预测工具，并评估该事件的影响 对BIMS迁移转化和湖泊生态的影响。 本研究的这一部分侧重于真实的时间测量， 观测所需的关键空气和水变量， 建模和预报活动，特别是地面 洋流、风和海浪， 目标.将部署两个多频高频雷达装置 沿着密歇根湖下游的海岸，以提供真实的时间 近地表海流和海流切变、风的观测 方向和波高在约2500平方米的面积。公里. 靠近密歇根湖下游海岸线。这项工作将 有助于理解偶发事件的总体目标 和跨边缘运输在五大湖和发展一个 便携式资料同化临近预报系统 下密歇根州的结果。

9726683 Vesecky Research will be undertaken in response to an Announcement of Opportunity (NSF 97-38)for Coastal Studies in the Great Lakes. This collaborative research project between investigators from 13 academic and government research institutions is being conducted under the auspices of the NSF Coastal Ocean Processes (CoOP) program and the NOAA Coastal Ocean Program. This 5-year research program will focus on the importance of episodic events on nearshore-offshore transport and subsequent ecological consequences. The study seeks to 1) determine what processes control the cross-margin (inshore to offshore) transport of biological, chemical, and geological materials in the coastal margins of the Great Lakes, and to 2) develop and test scientific strategies for assessing, quantifying, and predicting the impacts of multiple stresses both natural and anthropogenic, in the Great Lakes or selected coastal sub- regions. A tight coupling between contaminated sediments and overlying water exists in lakes and coastal ecosystems through the process of sediment resuspension. Satellite observations in Lake Michigan illustrate an annually recurrent episode of nearshore-offshore transport, a 10 km wide plume of resuspended material extending over 200 km along the southern shores of the lake. Preliminary evidence indicates that this episodic event may be the major mechanism for cross-margin sediment transport in Lake Michigan. This type of event impacts recycling of biogeochemically important materials (BIMS), ecosystem responses, cross-isobath transport in the Great Lakes. The program results will be applicable to similar events in many coastal areas. This comprehensive, interdisciplinary study will implement an integrated observational program and numerical modeling effort to identify, quantify, and develop prediction tools for the winter- spring resuspension event and to assess the impact of this event on the transport and transform ation of BIMS and on lake ecology. This component of the study focuses on real time measurements of key air and water variables necessary for the observational, modeling and forecasting activities, in particular surface currents, winds and waves that are pertinent to the overall objectives. Two multifrequency HF radar units will be deployed along the shore of lower Lake Michigan to provide real time observations of near surface current and current shear, wind direction and wave height over an area of about 2500 sq. km. adjacent to the lower Lake Michigan shoreline. This work will contribute to the overall goals of understanding episodic events and cross-margin transport in the Great Lakes and developing a portable data assimilation nowcast/forecast system based on the lower Michigan results.