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首页> 外文期刊>Limnology >Hypolimnetic turbulence generation associated with superposition of large-scale internal waves in a strongly stratified lake: Lake Biwa, Japan
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Hypolimnetic turbulence generation associated with superposition of large-scale internal waves in a strongly stratified lake: Lake Biwa, Japan

机译：激流湍流的产生与强分层湖中大型内部波的叠加有关：日本琵琶湖

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摘要

A 48-h microstructure experiment captured the variation of turbulence in Lake Biwa, Japan, during a strong stratification period, 1 week after a typhoon event. A free-fall microstructure profiler (TurboMAP) and a fine-scale profiler (F-probe) were deployed. An array of five ADCPs positioned close to the experiment site provided current measurements associated with the internal-wave field for a period of one week. Strong winds related to the passage of a typhoon close to the lake generated two low-frequency internal waves: a Kelvin wave and an inertial wave. Both waves were in the first baroclinic mode. This study pictures the superposition of two large-scale internal waves and a stronger current resulting from the two waves being in phase. The synchronization of the waves provoked enhanced shear in the hypolimnion, more than 10 m above the bottom, as well as high dissipation (10−7 W kg−1) and vertical diffusivity reaching 10−4 m2 s−1. The enhanced shear event seems to be related to the current amplitude since it occurred when the current amplitude was increased by the diel wind. Assuming the same turbulence intensity for the enhanced hypolimnetic shear events, this superposition may affect nutrient transfer in the hypolimnion. Also, we witnessed sediment resuspension, consisting of high turbidity and high fluorescence intensity, likely due to a combination of bottom stress and enhanced turbulence.
机译：一项48小时的微结构实验捕获了在台风事件发生后1周的强烈分层期间，日本琵琶湖的湍流变化。部署了自由下落的微结构轮廓仪（TurboMAP）和小尺寸轮廓仪（F-probe）。五个ADCP排列在靠近实验地点的位置，可在一周内提供与内部波场相关的电流测量值。与台风在湖附近通过有关的强风产生了两个低频内波：开尔文波和惯性波。两个波都处于第一斜斜模式。这项研究描绘了两个大型内部波的叠加以及由于两个波同相而产生的更强的电流。波的同步引起了下层斜面上的剪切力增强，高于底部10 m以上，并且高耗散（10-7 W kg-1）和垂直扩散率达到10-4 m2 s-1。增强的剪切事件似乎与电流幅度有关，因为它是在由diel风增加电流幅度时发生的。假设相同的湍流强度用于增强的低边剪剪切事件，则这种叠加可能会影响低边剪中的养分转移。此外，我们目睹了沉积物的重新悬浮，包括高浊度和高荧光强度，这可能是由于底部应力和湍流增强共同作用的结果。

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