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针对甲藻能够主动垂向移动的特点,将传统一维箱体模型修正成7层垂向结构,增加拉格朗日粒子在不同层之间的质量交换模拟甲藻的垂向移动,使用欧拉方法模拟水体中其余环境变量的变化,研究赤潮发生期间甲藻的垂向移动和水体中溶解氧浓度变化之间的关系。以香港吉奥湾为例,对2001年多纹膝沟甲藻赤潮进行了模拟分析;以叶绿素a和溶解氧两个指标对模型进行验证。结果表明:叶绿素a和溶解氧的垂向浓度分布的模拟值和实测值基本符合;赤潮期间甲藻发生明显的垂向迁移,其呼吸、生长速率有所增加,水体中溶解氧浓度迅速下降。对传统箱体模型的垂向分层有助于了解赤潮期间水体垂向上微生物和溶解氧分布的差异,为进一步研究赤潮发生机制提供了参考依据。
According to the characteristic that dinoflagellate can take the initiative to move vertically, the traditional one-dimensional box model is modified into a seven-layer vertical structure to increase the vertical movement of the dinoflagellate by the mass exchange between different layers of Lagrangian particles. Pull method to simulate the changes of the remaining environmental variables in the water to study the relationship between the vertical movement of dinoflagellates and the change of dissolved oxygen concentration in the water during the occurrence of red tide. Taking Jiao’ao Bay in Hong Kong as an example, the red tide of Prorocentrum korshinskii in 2001 was simulated and analyzed. Chlorophyll a and DO were used to validate the model. The results showed that the simulated values of the vertical concentration distribution of chlorophyll a and dissolved oxygen were in good agreement with the measured values. There was a significant vertical migration of dinoflagellate during the red tide period, and the respiration rate and growth rate increased while the dissolved oxygen concentration decreased rapidly. The vertical stratification of the traditional tank model helps to understand the differences of vertical distribution of dissolved oxygen and dissolved oxygen in the water bodies during the red tide, which provides a reference for further research on the mechanism of red tide occurrence.