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首页> 外文期刊>Ocean Dynamics >Numerical modelling of circulation and dispersion processes in Boulogne-sur-Mer harbour (Eastern English Channel): sensitivity to physical forcing and harbour design
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Numerical modelling of circulation and dispersion processes in Boulogne-sur-Mer harbour (Eastern English Channel): sensitivity to physical forcing and harbour design

机译：滨海布洛涅（东英吉利海峡）的环流和扩散过程的数值模拟：对物理强迫和港口设计的敏感性

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摘要

The MARS-3D model in conjunction with the particle tracking module Ichthyop is used to study circulation and tracer dynamics under a variety of forcing conditions in the eastern English Channel, and in the Boulogne-sur-Mer harbour (referred to hereafter as BLH). Results of hydrodynamic modelling are validated against the tidal gauge data, VHF radar surface velocities and ADCP measurements. Lagrangian tracking experiments are performed with passive particles to study tracer dispersal along the northern French coast, with special emphasis on the BLH. Simulations revealed an anticyclonic eddy generated in the harbour at rising tide. Tracers, released during flood tide at the Liane river mouth, move northward with powerful clockwise rotating current. After the high water, the current direction changes to westward, and tracers leave the harbour through the open boundary. During ebb tide, currents convergence along the western open boundary but no eddy is formed, surface currents inside the harbour are much weaker and the tracer excursion length is small. After the current reversal at low water, particles are advected shoreward resulting in a significant increase of the residence time of tracers released during ebb tide. The effect of wind on particle dispersion was found to be particularly strong. Under strong SW wind, the residence time of particles released during flood tide increases from 1.5 to 6 days. For release during ebb tide, SW wind weakens the southward tidally induced drift and thus the residence time decreases. Similar effects are observed when the freshwater inflow to the harbour is increased from 2 to 10 m3/s during the ebb tide flow. For flood tide conditions, the effect of freshwater inflow is less significant. We also demonstrate an example of innovative coastal management targeted at the reduction of the residence time of the pathogenic material accidentally released in the harbour.
机译：MARS-3D模型与粒子跟踪模块Ichthyop一起用于研究东英吉利海峡和滨海布洛涅（以下简称BLH）在各种强迫条件下的循环和示踪动力学。根据潮汐仪数据，VHF雷达表面速度和ADCP测量结果验证了流体动力学模型的结果。拉格朗日跟踪实验是使用被动粒子进行的，以研究示踪剂在法国北部沿海的扩散，特别是BLH。模拟显示出在涨潮时在港口产生的反气旋涡。在连恩河河口洪水期间释放的示踪剂，以强大的顺时针旋转电流向北移动。高水位过后，水流方向向西改变，示踪剂通过开放边界离开港口。在退潮期间，水流沿西部开放边界汇聚，但没有形成涡流，海港内的地表电流弱得多，示踪剂偏移长度小。在低水位逆流之后，颗粒向岸平流，导致退潮期间释放的示踪剂的停留时间显着增加。发现风对颗粒分散的影响特别强。在强西南风作用下，洪潮期间释放的颗粒的停留时间从1.5天增加到6天。为了在退潮期间释放，西南风减弱了南向潮汐引起的漂移，因此停留时间减少了。在退潮期间，流入港口的淡水从2增加到10 m3 / s时，观察到类似的效果。对于潮汐条件，淡水流入的影响较小。我们还展示了一个创新的沿海管理示例，旨在减少意外释放在港口的病原体的停留时间。

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