基于FBM法追踪秦皇岛海域赤潮迁移扩散

发布时间：2018-04-26 04:33

  本文选题：秦皇岛海域 + FBM　； 参考：《中国环境科学》2016年08期

【摘要】：在Delft3D-FLOW模型模拟水动力的基础上,基于FBM粒子追踪法建立和验证赤潮迁移扩散模型.模拟了秦皇岛海域潮流和风生流,分析了风生流对赤潮迁移扩散的作用,对比分析了FBM法、拉格朗日法和常规布朗运动法在赤潮迁移扩散模拟中的特性,测试了模型Hurst指数的敏感性并得出其在赤潮模拟中的合理取值范围.主要结论为:1秦皇岛海域的赤潮主要随潮流的涨落而往复移动,一个涨落潮周期内赤潮的净迁移距离较小;2秦皇岛海域夏季潮流较弱,但风对赤潮迁移具有一定影响,易产生东北向风生流,导致赤潮更易往东北方向迁移;3Hurst指数较明显地影响粒子云的扩散范围,Hurst指数取0.80±0.03能比较真实地模拟秦皇岛海域赤潮的迁移扩散;4FBM法可模拟赤潮的non-Fickian扩散现象,使其模拟的粒子云扩散范围和分布形状明显优于拉格朗日法和常规布朗运动法.
[Abstract]:Based on the hydrodynamic simulation of Delft3D-FLOW model, the red tide migration and diffusion model was established and verified by FBM particle tracing method. The effects of wind current on red tide migration and diffusion in Qinhuangdao sea area are simulated, and the characteristics of FBM method, Lagrangian method and conventional Brownian motion method in the simulation of red tide migration and diffusion are compared and analyzed. The sensitivity of the model Hurst exponent was tested and the reasonable value range of the model was obtained in the simulation of red tide. The main conclusions are as follows: the red tide in Qinhuangdao area moves back and forth with the fluctuation of tidal current, the net migration distance of red tide in a fluctuation tide period is smaller than that in Qinhuangdao Sea area, but the wind has a certain influence on the red tide migration. Easy to produce northeast wind flow, As a result, the red tide can migrate more easily to the northeast direction. The Hurst exponent of 0.80 卤0.03 can simulate the non-Fickian diffusion of the red tide in Qinhuangdao sea area. The diffusion range and distribution shape of the simulated particle cloud are obviously superior to those of the Lagrangian method and the conventional Brownian motion method.
【作者单位】： 同济大学土木工程学院水利工程系;广西壮族自治区交通规划勘察设计研究院;上海海洋大学海洋科学学院;
【基金】：国家海洋公益项目(201305003)
【分类号】：X55
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本文编号：1804516