Computer Simulation of Larval Transport Through Tidal Channels: Role of Vertical Migration
Computer Simulation of Larval Transport Through Tidal Channels: Role of Vertical Migration
复制标题
幼虫通过潮汐通道运输的计算机模拟：垂直迁移的作用
DOI：
10.1006/ecss.1993.1040
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发表时间：
1993
影响因子：
2.8
通讯作者：
A. Stoner
中科院分区：
文献类型：
--
作者：
N. Smith;A. Stoner
摘要利用二维计算机模型研究了潮道中仔鱼的长期净平流输运。模拟是在一年的时间周期为Adderley通道在巴哈马群岛的Exuma珊瑚礁，和阿兰萨斯通行证在得克萨斯州墨西哥湾沿岸。在这两个位置的潮汐条件分别占主导地位的半日和昼夜成分。幼虫运输模拟的产品的预测潮流和幼虫浓度在每五层。幼虫的垂直分布是垂直迁移和湍流扩散的函数，垂直迁移的作用是将幼虫集中在顶层和底层，湍流扩散往往会产生垂直均匀的浓度。湍流混合的效果是负相关的幼虫的垂直游泳能力，并大大减少了较慢的游泳者的净运输。光和潮汐相线索迁移被认为是。昼夜迁移的结果，在一个独特的年度周期的运输幼虫，作为昼夜潮汐成分周期的相位与光明和黑暗的条件。然而，很少有长期的净运输。根据潮汐阶段的迁移产生一个可以忽略不计的年度周期，但大量的准稳定净运输的幼虫表示为两个研究地点。在其他模拟中，引入非潮汐流来代表淡水外流和低频河口-陆架交换，并将未指定的保留机制纳入模型。对于这些研究地点，非潮汐运输和幼虫滞留占主导地位的垂直迁移的影响。
Abstract A two-dimensional computer model is used to investigate the long-term net advective transport of larvae in tidal channels. Simulations are made over l-year time periods for Adderley Channel in the Exuma Cays of the Bahama Islands, and Aransas Pass on the Texas Gulf coast. Tidal conditions at these two locations are dominated by semi-diurnal and diurnal constituents, respectively. Larval transport is simulated by the product of the predicted tidal current and the larval concentration in each of five layers. The vertical distribution of larvae is a function of vertical migration, which acts to concentrate larvae in top and bottom layers, and turbulent diffusion, which tends to produce vertically uniform concentrations. The effect of turbulent mixing is inversely related to the vertical swimming ability of the larvae and reduces substantially the net transport of slower swimmers. Both light and tidal phase cued migrations are considered. Diel migration results in a distinct annual cycle in the transport of larvae, as diurnal tidal constituents cycle in and out of phase with light and dark conditions. However, little long-term net transport is indicated. Migration according to tidal phase produces a negligible annual cycle, but a substantial quasi-steady net transport of larvae is indicated for both study sites. In other simulations, non-tidal currents are introduced to represent freshwater outflow and low-frequency estuarine-shelf exchanges, and unspecified retention mechanisms are incorporated into the model. For these study sites, both non-tidal transport and larval retention dominate the effect of vertical migration.