Oceanographic and Water-Quality Measurements collected south of Marthas Vineyard, MA, November-December 2015

Two platforms were deployed at adjacent sites near the Marthas Vineyard Coastal Observatory (MVCO) to compare their ability to measure bottom shear stress. One platform was a low-profile (20 cm-high) sled, and the other platform was a large (2.5-m high) quadpod. Both platforms supported a pair of single-point acoustic-Doppler current meters and an acoustic-Doppler current profiler. On the sled, the instruments were mounted close to the seafloor and looked upward; on the quadpod, the instruments were mounted about 1.5 m above the bottom and looked downward. The quadpod also supported an upward-looking five-beam acoustic Doppler current profiler and instruments to measure temperature, salinity, and turbidity. This dataset was collected primarily to evaluate methods for measuring bottom shear stress, but it also provides useful information on waves, currents, and sediment transport.

两台观测平台布设于玛莎葡萄园岛海岸观测站（Marthas Vineyard Coastal Observatory, MVCO）邻近的站点中，用于对比二者测量底切应力（bottom shear stress）的能力。其中一台为高度20厘米的低矮型滑撬式平台，另一台为高度2.5米的高大四脚架平台（quadpod）。两台平台均搭载了两台单点声学多普勒海流计（single-point acoustic-Doppler current meters）与一台声学多普勒海流剖面仪（acoustic-Doppler current profiler）。滑撬平台上的仪器安装于贴近海底的位置，朝上布设；四脚架平台上的仪器则安装于海底上方约1.5米处，朝下布设。四脚架平台额外搭载了一台朝上布设的五波束声学多普勒海流剖面仪（five-beam acoustic Doppler current profiler），以及用于测量温度、盐度与浊度的观测仪器。本数据集的采集初衷主要为评估底切应力的测量方法，同时也可提供与海浪、海流及泥沙输运相关的有效观测信息。