Frontogenesis at Estuarine Junctions
Frontogenesis at Estuarine Junctions
复制标题
河口交界处的锋生
DOI：
10.1007/s12237-020-00697-1
复制
发表时间：
2020
影响因子：
2.7
通讯作者：
Geyer, W. Rockwell
中科院分区：
文献类型：
--
作者：
Corlett, W. Bryce;Geyer, W. Rockwell
观测的纽瓦克湾，一个子河口网络的特点是多个路口，揭示了前产生的潮汐流通过过渡通道的几何形状。所有的前线大大有助于沿通道河口的异质性，大多数都与通道的几何形状和潮汐速度相移的变化。落潮时，由于向海航道的突然扩张，在河口附近形成了一个抬离锋。而形成，前增强的潮汐速度相移，涨潮持续在主河口，直到90分钟后，在子河口落潮开始。落潮期间，在通道-侧通道交界处形成第二抬离锋，并通过主通道和侧通道之间的斜压和正压潮汐速度相移引起的侧斜压环流增强。横向环流也分叉沿通道落潮流在表面上，产生一个表面锋以上的抬离锋。在纽瓦克湾的顶部，落潮期间在两个支流河口的汇合处形成第二表面锋。该汇合锋通过邻近支流河口的高速旋转穿过主要淡水源口，并通过横向应变和混合在大部分落潮期间维持。虽然整体分层的纽瓦克湾将其归类为一个部分混合的河口，前划分的密度结构的子河口成一系列的几乎均匀的片段，一个特征，更经常与峡湾。
Observations of Newark Bay, a sub-estuary network characterized by multiple junctions, reveal that fronts are generated by tidal flow through transitions in channel geometry. All fronts substantially contribute to along-channel estuarine heterogeneity, and most are associated with both changes in channel geometry and tidal velocity phase-shifts. A lift-off front forms at the mouth of the sub-estuary during ebb tide in response to the abrupt seaward channel expansion. While forming, the front is enhanced by a tidal velocity phase-shift; flood tide persists in the main estuary until 90 min after the start of ebb tide in the sub-estuary. A second lift-off front forms during ebb tide at a channel–side-channel junction and is enhanced by a lateral baroclinic circulation induced by baroclinic and barotropic tidal velocity phase-shifts between the main channel and side channel. The lateral circulation also bifurcates the along-channel ebb flow at the surface, generating a surface front above the lift-off front. At the head of Newark Bay, a second surface front forms during ebb tide at the confluence of two tributary estuaries. This confluence front is rotated across the mouth of the primary fresh water source by high velocities from the adjacent tributary estuary and is maintained through much of ebb tide by lateral straining and mixing. Although the overall stratification of Newark Bay would categorize it as a partially mixed estuary, the fronts divide the density structure of the sub-estuary into a series of nearly homogeneous segments—a characteristic that is more often associated with fjords.
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DOI：
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发表时间：
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