The Internal Seiches in Gullmar Fjord. Part I: Dynamics
The Internal Seiches in Gullmar Fjord. Part I: Dynamics
复制标题
古尔玛峡湾的内塞西斯 (Internal Seiches)。
DOI：
--
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
B. Liljebladh
中科院分区：
文献类型：
--
作者：
L. Arneborg;B. Liljebladh
摘要利用高分辨率的锚泊资料，研究了古尔马峡湾1-3天周期的内假潮运动。一个简单的分析三层模型，考虑到阻塞的盆地水在窗台的内部假潮的周期和结构进行了很好的描述。估计了假潮强迫和阻尼的能量收支。内部假潮是由表面的直接风应力和频率接近假潮的内部海岸波强迫产生的，后者的贡献稍大一些。内部假潮阻尼的e-折叠时间尺度近似等于假潮周期，这意味着假潮被有效地阻尼，但也意味着为了维持观测到的假潮运动，强迫必须处于近共振状态。在盆地水中，假潮表现为大的垂直运动和明显的上升相位传播。相位的传播与一个连续的，而不是严格的层…
Abstract Internal seiche motions with period 1–3 days in Gullmar Fjord are investigated based on mooring data with high vertical and time resolution. The period and structure of the internal seiches are well described by a simple analytical three-layer model taking into account blocking of the basin water at the sill. Energy budgets for forcing and damping of the seiches are estimated. The internal seiches are forced by direct wind stress on the surface and by internal coastal waves of frequency close to the seiches, the latter contribution being a little larger. The e-folding timescale for the internal seiche damping is approximately equal to the seiche periods, which means that the seiches are effectively damped, but also that the forcing must be in near resonance in order to maintain the observed seiche motions. In the basin water the seiches manifest themselves with large vertical motions and clear upward phase propagation. The phase propagation is related with a continuous, rather than strictly layer...