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The baroclinic response to wind in a small two-basin lake

机译：两盆小湖对风的斜压响应

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摘要

Field data and two linear layered models were used to examine the baroclinic response to wind in a small elongated two-basin lake, Amisk Lake (Alberta, Canada). For the first vertical baroclinic mode, wind-forced horizontal modes were simulated using a dynamic two-layer variable cross-section (TVC) model. The first horizontal mode, H1, was found to dominate the exchange between the two basins of Amisk Lake. The highest velocities associated with H1 occurred in the constricted channel connecting the two basins. This high velocity led to strong damping which brought H1 in near-resonance with the diurnal wind despite a difference in periods. Along with H1, the second horizontal mode, H2, was detected at a thermistor mooring. The TVC showed that H2 resulted from the coupling between along-thalweg wind distribution and the bathymetry of Amisk Lake. The damping for H2 was found to be weaker than for H1, likely because of weaker bottom drag in the connecting channel. The evolution of vertical H1 modes were simulated using a multi-layered box model. In response to wind pulses, the first vertical mode V1H1 initially dominated over higher vertical modes causing two-layer exchange. Following the faster decay of V1H1, higher vertical modes shifted the exchange to three and more layers. Our study shows the importance of the coupling between wind stress distribution and lake bathymetry in exciting horizontal modes, reveals the effect of damping on resonance with wind, and explains the evolution of exchange associated with vertical modes.
机译：现场数据和两个线性分层模型用于检查小型拉长的两盆湖泊Amisk Lake（加拿大艾伯塔省）对风的斜压响应。对于第一个垂直斜压模式，使用动态两层可变横截面（TVC）模型模拟​​了风力水平模式。发现第一个水平模式H1主导了Amisk湖两个盆地之间的交换。与H1相关的最高速度出现在连接两个盆地的狭窄通道中。如此高的速度导致了强烈的阻尼，尽管周期有所不同，但H1却与日风产生了近似的共振。与H1一起，在热敏电阻系泊处检测到第二种水平模式H2。 TVC显示H2是由沿thalweg风分布和Amisk湖的测深仪之间的耦合产生的。发现H2的阻尼比H1的阻尼弱，这可能是因为连接通道的底部阻力较弱。使用多层盒模型模拟了垂直H1模式的演变。响应于风脉冲，第一垂直模式V1H1最初在较高的垂直模式上占主导地位，从而导致两层交换。随着V1H1的衰减更快，更高的垂直模式将交换移至三层及更多层。我们的研究表明，在令人兴奋的水平模式下，风应力分布与湖测深之间耦合的重要性，揭示了阻尼对风共振的影响，并解释了与垂直模式相关的交换的演化。

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  • 来源
    《Aquatic Sciences》 |2013年第2期|213-233|共21页
  • 作者

    Y. E. Imam; B. E. Laval; G. A. Lawrence;

  • 作者单位

    Department of Civil Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada;

    Department of Civil Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada;

    Department of Civil Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lake hydrodynamics; wind-driven; baroclinic modes; amisk lake; resonance; damping;

    机译：湖泊水动力风力驱动斜压模式阿米斯克湖谐振;阻尼;

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