Collaborative Research: Asymmetric Circulation in Wind-Driven Bays

在墨西哥下加利福尼亚半岛加利福尼亚湾一侧的巴伊亚康塞普西翁收集了环流和相关物理变量的观测资料。最初研究的第一个目标是通过观察来描述在一个相对较深、混合良好、半封闭的海湾中，旋转是如何影响风力驱动的环流的。我们正在提交这些结果以供发表。原计划只在混合良好的冬季进行的观察期延长到全年，包括高度分层的夏季。扩展的数据集使我们有机会描述水柱分层时海湾的物理情况。本研究的重点是三个独立的时间尺度：与分层发生和消亡有关的季节周期、内部潮汐、正压和斜压潮。最初研究的第二个目标是建立一个分析模型来表示潮汐驱动的环流以及摩擦和旋转对河口水流的影响。这些任务现在已经完成。在冬季观测结果的激励下，我们建议建立三维随时间变化的风驱动流分析模型，包括平流的影响，并将潮汐模拟工作扩展到包括分层盆地。更广泛的影响小型沿海盆地（海湾、河口、泻湖）的生态和社会重要性与其规模不成比例。在许多其他重要的生态功能中，泻湖和河口是候鸟的中转站，是种类繁多的动植物的托儿所，也是太平洋灰鲸等海洋哺乳动物交配和产仔的场所。与此同时，这些水体也受到了人为活动的深刻影响。许多（如果不是全部的话）被用作污水和受污染的水进入海洋的通道。在过去的三年里，我们与圣地亚哥县几个泻湖的工程顾问和非专业团体建立了联系，并与他们进行了会谈。我们计划通过提供免费的建议和咨询来进一步发展这些协会。为了缓和，So。加州爱迪生公司正在对圣地亚哥北部的圣地亚哥潟湖进行8000万美元的修复。在这里，我们建议与海岸环境公司合作，该公司负责项目的科学管理，同时我们为圣地亚哥潟湖保护协会和其他倡导团体提供建议。这个项目将使我们能够与高中生一起参加暑期实践活动，并继续我们与佛罗里达州小学的推广工作。此外，这项研究代表了美国科学家（包括少数民族代表）和墨西哥科学家之间的合作。这项研究将继续加强少数群体对科学的参与。它将培养一名研究生和一名博士后，并使包括少数民族本科生在内的许多人接触到最先进的数据收集、分析和数值模型的应用。它将促进墨西哥的国际合作和能力建设，并将大大提高pi在研究生和本科阶段教授的课程。

Intellectual MeritObservations of circulation and related physical variables have been collected in Bahia Concepcion, on the Gulf of California side of the Baja California peninsula in Mexico. The first goal of the original study was to describe through observations how rotation affects the wind-driven circulation in a relatively deep, well-mixed, semi-enclosed bay. We are in the process of submitting those results for publication. The period of observations, originally planned to last only through the well-mixed winter season, was extended to the entire year, including the highly stratified summer season. The extended data set gives us the opportunity to describe the physics of the bay when the water column is stratified. This study focuses on three separate time scales: the seasonal cycle associated with the onset and demise of stratification, the internal tides, and the barotropic and baroclinic seiches. The second goal of the original study was to develop an analytical model to represent the circulation driven by tides and the effects of friction and rotation on the estuarine flow. Those tasks are now complete. Motivated by the results of the winter observations we propose here to develop analytical models of three-dimensional time-dependent wind-driven flow, including the effect of advection, and to extend the tidal modeling effort to include stratified basins.Broader ImpactsThe ecological and societal importance of small coastal basins (bays, estuaries, lagoons) is outof proportion with their size. Among many other important ecological functions, lagoons and estuaries serve as way stations for migrating birds, as nurseries for an immense variety of fauna and flora and as mating and calving grounds for marine mammals such as the Pacific gray whale. At the same time these water bodies have been deeply impacted by anthropogenic activities. Many, if not all, are used as pathways through which sewage and contaminated waters are introduced into the ocean. In the past three years we have developed contacts with and given talks to engineering consultants and lay groups who are stewards of several lagoons in San Diego county. We plan to further develop these associations by providing free advice and consultation. By way of mitigation, The So. Cal. Edison company is undertaking an eighty million dollar restoration of San Dieguito Lagoon, north of San Diego. Here we propose to work with Coastal Environments, the consultancy charged with the scientific management of the project at the same time as we advise the San Dieguito Lagoon conservancy and other advocate groups. This project will allow us to participate in summer hands-on activities with high school students, and continue our outreach efforts with Florida elementary schools. In addition, this study represents a collaboration between scientists from the USA, including a minority representative, and Mexican scientists. The study will continue to enhance the participation of minority groups in science. It will train one graduate student and one Post-Doc and expose many others, including minority undergraduates, to state-of-the-art data collection, analysis and the application of numerical models. It will facilitate international cooperation and capacity building in Mexico and will also greatly enhance the courses taught by the PIs at graduate and undergraduate levels.