Seasonal evolution of the basin‐scale internal wave field in a large stratified lake
Seasonal evolution of the basin‐scale internal wave field in a large stratified lake
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大型层状湖泊盆地尺度内波场季节演化
DOI：
10.4319/lo.2000.45.7.1621
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发表时间：
2000
影响因子：
4.5
通讯作者：
Â. Saggio
中科院分区：
文献类型：
--
作者：
J. Antenucci;J. Imberger;Â. Saggio
1997年和1998年期间，使用从热敏电阻链和声学多普勒海流剖面仪收集的数据，在Kinneret湖（以色列）研究了水柱对不同分层和风强迫条件的响应。强烈的每日海风被发现产生垂直模式1内部开尔文波和垂直模式1，2和3的流域尺度内部庞加莱波。Kelvin波是内波场的主要分量，对近岸区域的沿岸速度起作用。在逆风靠近海岸的区域，速度主要由对风的强迫响应决定，并且在性质上是跨海岸的。在湖泊内部，Kelvin波对水平速度场的影响比更高的垂直模式Poincareé波要小。Kelvin波存在于共振和非强迫状态与风，而垂直模式1庞加莱波能量保持相对恒定，尽管在强迫条件的大的变化。高模庞加莱波的能量变化很大，无论是在日常和季节的时间尺度。结果表明，风能迫使多个流域尺度内波模式，在确定周期性受力系统中的后续内波响应时，必须考虑水柱中的先前运动。
The response of the water column to varying conditions of stratification and wind forcing was investigated in Lake Kinneret (Israel) using data collected from thermistor chains and acoustic Doppler current profilers during 1997 and 1998. The strong daily sea breeze was found to generate a vertical mode 1 internal Kelvin wave and basin‐scale internal Poincaré waves of vertical modes 1, 2, and 3. The Kelvin wave, the dominant component of the internal wave field, was responsible for alongshore velocities in the nearshore regions. In the upwind nearshore regions, velocities were dominated by the forced response to the wind and were cross‐shore in nature. In the lake interior, the Kelvin wave effect on the horizontal velocity field was minor compared to the higher vertical mode Poincareé waves. The Kelvin wave is shown to exist in resonant and nonforced states with the wind, whereas the vertical mode 1 Poincaré wave energy remained relatively constant, despite large variability in the forcing conditions. The energy in the higher mode Poincaré waves varied greatly, both on daily and seasonal timescales. The results demonstrate that the wind energy forces multiple basin‐scale internal wave modes and that prior motion in the water column must be considered when determining the subsequent internal wave response in periodically forced systems.