AUV observations of mixing in the tidal outflow from a Scottish sea loch
AUV observations of mixing in the tidal outflow from a Scottish sea loch
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AUV 对苏格兰海湾潮汐混合的观测
DOI：
10.1109/auv.2010.5779670
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
C. Griffiths
中科院分区：
文献类型：
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作者：
T. Boyd;M. Inall;E. Dumont;C. Griffiths
从河口系统流出的淡水携带营养物质、沉积物、幼虫和其他物质进入沿海海洋，在那里它们与环境海水混合。洛赫Etive是这样一个河口的苏格兰西海岸，是由一个大的降雨集水区，并从其中流出强烈调制的潮汐基础。退潮时，淡水以脉冲形式离开洛赫，作为薄层释放到沿海海洋中，其前沿发展成波状孔或一系列具有强烈混合和相关夹带的内部孤立波。一艘Hydroid型600米深度自动潜水器配备了一个前置微结构传感组件，与系泊测量一起用于研究定期释放到沿海海洋中的薄淡水层的动态。在2009年冬季和2010年春季进行的观测，我们观察到湍流孔和内部孤立波Ardmucknish湾，入口附近的洛赫Etive。的孔和内部孤立波的抑郁症的通道与近地表水的垂直向下运动和湍流混合，增强超过2个数量级以上的背景。
Freshwater outflows from estuarine systems carry nutrients, sediments, larvae and other materials into the coastal ocean where they mix into ambient ocean water. Loch Etive is one such estuary on the west coast of Scotland that is fed by a large rainfall catchment area, and from which the outflow is strongly modulated on a tidal basis. Freshwater leaves the loch on the ebbing tide in a pulse released into the coastal ocean as a thin layer, the leading edge of which develops into an undular bore or a train of internal solitary waves with strong mixing and associated entrainment. A Hydroid 600 m depth-rated AUV equipped with a forward-mounted microstructure sensing package has been used in conjunction with moored measurements to study the dynamics of thin freshwater layers that are regularly released into the coastal ocean. During observations conducted in winter 2009 and spring 2010 we observed turbulent bores and internal solitary waves in Ardmucknish Bay, near the entrance to Loch Etive. The passage of the bores and internal solitary waves of depression were associated with downward vertical movement of near-surface water and turbulent mixing that was enhanced above background by over 2 orders of magnitude.