ADCP Measurements of Momentum Balance and Dynamic Topography in a Constricted Tidal Channel
ADCP Measurements of Momentum Balance and Dynamic Topography in a Constricted Tidal Channel
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DOI：
10.1175/jpo2836.1
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发表时间：
2006-02
影响因子：
3.5
通讯作者：
R. Vennell
中科院分区：
文献类型：
--
作者：
R. Vennell
摘要通过入口的潮汐流的动力学还没有完全了解，观测是稀缺的，因为小的空间尺度上的流量变化。本文给出了第一个详细的测量的二维结构的潮流和动力学项的动量方程内的潮汐入口，从而提高了对潮汐入口的物理学的理解。在180 cm s−1的峰值流中，近稳态的动量平衡主要由水平平流和压力梯度控制，底摩擦起次要作用。在静水中，局部加速度和压力梯度之间存在平衡。数值积分的ADCP测得的条款的动量方程产生60米分辨率的动态地形，显示了7厘米的变化，在洪水高峰与伯努利方程一致。由于摩擦，表面地形形成了一个线性斜坡，在600 m处的不可逆水头损失峰值为2 cm。从ADCP中提取了潮汐速度...
Abstract The dynamics of tidal flow through inlets are not fully understood; observations are scarce because of the small spatial scales over which the flow varies. This paper gives the first detailed measurements of the 2D structure of tidal currents and the dynamical terms of the momentum equation within a tidal inlet, leading to an improved understanding of the physics of tidal inlets. In the 180 cm s−1 peak flow the near-steady-state momentum balance is dominated by horizontal advection and the pressure gradient, with bottom friction playing a secondary role. At slack water, there is a balance between local acceleration and the pressure gradient. Numerical integration of the ADCP-measured terms in the momentum equation yields 60-m- resolution dynamic topography that shows a 7-cm variation at peak flood consistent with Bernoulli’s equation. The surface topography because of friction forms a linear ramp with a peak irreversible head loss of 2 cm over 600 m. Tidal velocities were extracted from the ADCP ...