Using Depth-Normalized Coordinates to Examine Mass Transport Residual Circulation in Estuaries with Large Tidal Amplitude Relative to the Mean Depth
Using Depth-Normalized Coordinates to Examine Mass Transport Residual Circulation in Estuaries with Large Tidal Amplitude Relative to the Mean Depth
复制标题
使用深度归一化坐标检查潮汐幅度相对于平均深度较大的河口的物质输送剩余环流
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Stacey
中科院分区：
文献类型：
--
作者：
S. Giddings;S. Monismith;D. Fong;M. Stacey
潮汐幅深比大的河口残馀（潮下）环流剖面图往往非常复杂，与传统的河口重力环流剖面图不同。本文描述了在潮汐振幅与平均深度相当的河口中，深度归一化的σ-坐标系如何比固定的垂直坐标系更能说明剩余环流剖面的物理解释。深度归一化坐标允许拉格朗日残差的近似，经验正交函数（EOF）分析的性能，沿流动量方程中整个深度项的估计，以及潮汐平均动量平衡的计算。由于斯托克斯波传输速度在所有深度都指向上游，因此相对于欧拉平均值，剩余质量传输速度具有增强的两层交换流。而观测到的σ-坐标剖面类似于重力环流，压力和摩擦力…
AbstractResidual (subtidal) circulation profiles in estuaries with a large tidal amplitude-to-depth ratio often are quite complex and do not resemble the traditional estuarine gravitational circulation profile. This paper describes how a depth-normalized σ-coordinate system allows for a more physical interpretation of residual circulation profiles than does a fixed vertical coordinate system in an estuary with a tidal amplitude comparable to the mean depth. Depth-normalized coordinates permit the approximation of Lagrangian residuals, performance of empirical orthogonal function (EOF) analysis, estimation of terms in the along-stream momentum equations throughout depth, and computation of a tidally averaged momentum balance. The residual mass transport velocity has an enhanced two-layer exchange flow relative to an Eulerian mean because of the Stokes wave transport velocity directed upstream at all depths. While the observed σ-coordinate profiles resemble gravitational circulation, and pressure and fricti...