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Eulerian and lagrangian transport time scales of a tidal active coastal basin

机译：潮汐活跃沿海盆地的欧拉和拉格朗日运输时间尺度

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摘要

In this work the flushing features of a tidal active coastal basin, the Venice lagoon, have been investigated. The water transport time scale ('ITS) has been computed by means of both an eulerian and a lagrangian approach. The obtained results have been compared in order to identify the main differences between the two methods. The eulerian water transport time (WRT) scale has been computed through the definition of the remnant function of a passive tracer released inside the lagoon whereas the lagrangian water transport time (WTT) scale has been computed tracking the trajectories of simulated particles released inside the basin. Both the methodologies rely on computer modeling. A 2D hydrodynamic model based on the finite element method has been used. The model solves the shallow water equations on a spatial domain that represents the whole Adriatic Sea and the Venice lagoon. Numerical computations show that the two techniques, when applied to a tidal active coastal basin, characterized by a complex morphology and dynamic, are differently influenced by the tidal variability. In particular, the type and the phase of the tidal forcing at the beginning of the computation strongly influence the WTTs distribution within the basin. On the other hand, the WRTs computation is not affected by the tidal forcing variability.
机译：在这项工作中，已经研究了潮汐活跃沿海盆地威尼斯泻湖的冲刷特征。通过欧拉方法和拉格朗日方法已经计算了水运输时间尺度（'ITS）。为了确定两种方法之间的主要区别，对获得的结果进行了比较。通过定义泻湖内部释放的被动示踪剂的残余函数来计算欧拉水迁移时间（WRT）尺度，而通过追踪盆地内部释放的模拟粒子的轨迹来计算拉格朗日水迁移时间（WTT）尺度。两种方法都依赖于计算机建模。使用了基于有限元方法的二维流体动力学模型。该模型在代表整个亚得里亚海和威尼斯泻湖的空间域上求解浅水方程。数值计算表明，两种技术应用于潮汐活跃沿海盆地时，其形态和动力复杂，受潮汐变化的影响不同。特别是，在计算开始时的潮汐强迫的类型和阶段会强烈影响盆地内WTT的分布。另一方面，WRT的计算不受潮汐强迫变化的影响。

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