POWRE: Development of Instrumentation for In-Situ Measurement of Bottom Shear Stress Over Moveable Beds at LEO-15

POWRE：开发 LEO-15 可移动床上底部剪切应力原位测量仪器拟议的工作涉及开发多向剪切板，以便在位于新泽西州南部海岸近海 15 m 水深的长期生态系统观测站 (LEO-15) 研究区的可移动床上获得原位直接底部剪切应力测量。 这些类型的测量对于海洋科学家和工程师至关重要。 沉积物输送、浅水中波浪变换预测以及中观和大尺度水体循环的数值模型都需要河床剪应力的输入估计值。 目前，复杂流态下的时均床剪应力 EMBED 方程 2 的直接测量仍然无法实现；用于沉积物输送和波浪变换模型的 EMBED Equation.2 的估计是通过间接方法获得的。 首席研究员最近开发了一种在实验室中直接测量可移动床上的底部剪切应力的技术（Rankin，1997）。 该技术提供了底部剪切应力的直接、实时测量，并且不需要有关床上方边界层中的流动特征的信息； 因此它非常适合复杂的流态。 我建议继续开发用于 LEO-15 的剪切板装置。 拟议的仪器开发工作将以多种重要方式为我们对沉积物输送和海洋现场安装的了解以及国家学术研究基础设施做出贡献。 该装置的开发对于模拟沉积物迁移和水动力过程的物理海洋学家、研究疏浚技术和绘制受污染沉积物的命运和迁移的环境工程师以及检查底栖群落斑块动态的生物海洋学家都具有价值。 POWRE 奖将对 Rankin 博士的职业生涯产生重大影响。 作为一名新研究者，该奖项将为她提供一个机会，通过开发新仪器和使用最先进的海洋学现场设备来加强她的研究活动。 通过 POWRE 的客座教授计划，Rankin 博士将有机会与全国知名的海洋学家团队合作。

POWRE: Development of Instrumentation for In-Situ Measurement of Bottom Shear Stress over Moveable Beds at LEO-15 The proposed effort involves the development of a multi-directional shear plate to obtain in-situ direct bottom shear stress measurements over moveable beds at the Long-term Ecosystem Observatory (LEO-15) research area located offshore of the southern coast of New Jersey in 15 m of water. These types of measurements are of critical importance to ocean scientists and engineers. Numerical models for sediment transport, for the prediction of wave transformation in shallow water, and for the circulation of water bodies on meso- and large- scales, all require as input estimates of bed shear stress. At the present time, the direct measurement of the time-average bed shear stress, EMBED Equation.2 , under complex flow regimes remains unattainable; estimates of EMBED Equation.2 used for sediment transport and wave transformation models are obtained through indirect methods. A technique for the direct measurement of the bottom shear stress over a moveable bed in the laboratory was recently developed by the Principal Investigator (Rankin, 1997). This technique offers direct, real time measurements of the bottom shear stress and does not require information about the flow characteristics in the boundary layer above the bed; it is thus well suited for complicated flow regimes. I propose to continue the development of a shear plate device for use at LEO-15. The proposed instrumentation development effort will contribute in several significant ways to our knowledge of sediment transport and oceanographic field installation, and to the nation's academic research infrastructure. The development of this device will be of value to physical oceanographers modeling sediment transport and hydrodynamic processes, to environmental engineers studying dredging techniques and mapping the fate and transport of contaminated sediments and to biological oceanographers examining the patch dynamics of benthic communities. The POWRE award would have a significant impact on the career of Dr. Rankin. As a new investigator, this award will provide an opportunity to enhance her research activities through the development of new instrumentation and access to state-of-the-art oceanographic field equipment. Through POWRE's Visiting Professor program, Dr. Rankin will be afforded the opportunity to collaborate with a nationally known team of oceanographers.