The Hydromechanics of Sediment Traps in the Oceanic Environment: Key to Accurate Particle Flux Measurements

海洋环境中沉积物捕集器的流体力学：精确测量颗粒通量的关键

• 批准号: 8813436
• 负责人: Giselher Gust
• 金额: $ 37.46万
• 依托单位: University of South Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-11-15 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8813436&HistoricalAwards=false
• 关键词: Hydromechanics; Sediment; Traps; Oceanic; Environment

An In situ investigation of the relationship between sediment trap collection efficiency and trap hydrodynamics will be conducted for sediment trap designs, cone shaped and cylindrical, which are integral to the Global Ocean Flux initiative in the Atlantic Ocean. The studies will include a careful assessment of moored versus drifting sediment trap collection systems at the Bermuda site where long term observations are in progress. The independent variable in this investigation is sediment trap geometry, while the dependent variables are trap hydrodynamics and collection efficiency. In situ hydrodynamic observations will be obtained using laboratory-calibrated self-contained instrument packages (HDS) which record both flow and well shearing stress in a non-obstrusive way at critical locations inside and outside the traps. One of the principal products of the work will be a simple, easy-to-use, flow-field sensor package which can be applied to Global Ocean Flux investigations. By linking particle accumulation rates with In situ hydrodynamic observations in and around sediment traps, it is expected that fluid-dynamic bias can be removed and flux rates inferred which are functionally equivalent to those provided by an ideal, non- obtrusive collection device.

沉积物之间关系的现场调查 捕集器收集效率和捕集器流体动力学将是 针对沉淀物收集器设计进行，锥形和圆柱形， 这是全球海洋流动倡议的组成部分， 大西洋 这些研究将包括仔细评估 系泊与漂流沉积物收集系统 正在进行长期观察的百慕大站点。 的 本次调查自变量为泥沙圈闭 几何，而因变量是陷阱流体力学 收集效率。 现场水动力观测 将使用实验室校准的自含式 记录流量和油井的仪器包（HDS） 在关键位置以非阻塞方式产生的剪应力 在陷阱的内外。 的主要产品之一 这项工作将是一个简单的，易于使用的，流场传感器包 可应用于全球海洋通量调查。 通过 将颗粒累积速率与原位流体动力学联系起来 在沉积物收集器内和周围的观察，预计， 可以去除流体动力学偏差，并推断通量率， 在功能上等同于由理想的、非理想的 一个很显眼的收集装置