摘要
通过建立水质模型与微囊藻属浮力调节模型相结合的复合模型,模拟微囊藻属在静止水体中的迁移轨迹.模拟结果表明:微囊藻属在不同水深的水体中呈现不同的迁移轨迹.当水深较浅,大量光强可以直射水底时,不同直径大小的微囊藻群体均沉降在水底;当水深较深时,不同直径大小的微囊藻群体均在水深方向周期性上浮下沉运动.群体直径大小决定微囊藻属的垂向迁移幅度,直径越大的微囊藻群体在水深方向的迁移幅度越大.消光系数决定微囊藻属的迁移中心位置,消光系数小,微囊藻属在水深较深处运动;消光系数大,微囊藻属在靠近水面处运动.
In this paper,a mathematical model coupling buoyancy regulation model and hydrodynamic model was developed to simulate the trajectory of Microcystis colonies in calm water.The simulation results showed that Microcystis present different movement trajectories in water with different depths.In shallow water where large amounts of incident light could reach at the bottom of water,all the Microcystis colonies,whatever size they have,stayed at the bottom.However,in deep water,again whatever size they have,Microcystis colonies made periodical movements.The simulation results revealed that colony size was the main factor that determined the trajectory amplitude in the vertical.The Microcystis colony with larger size would reach deeper positions and also reach water surface.Extinction coefficients determined the movement position.If the extinction coefficient was small,Microcystis colonies would move in the deeper position.On the contrary,if the extinction coefficient was large,the colonies would move near the water surface.
作者
俞茜
陈永灿
刘昭伟
YU Qian;CHEN Yong-can;LIU Zhao-wei(China Institute of Water Resources and Hydropower Research, Beijing 100038, China;Center of Disaster Reduction of the Ministry of Water Resources, Beijing 100038, China;School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第5期1915-1921,共7页
China Environmental Science
基金
国家科技支撑项目(2015BAB07B09)
国家自然科学基金资助项目(51579130,91647116)
教育部创新团队发展计划(IRT13025)
关键词
微囊藻属
迁移轨迹
浮力调节
消光系数
数值模拟
Microcystis
migration trajectory
buoyancy regulation
extinction coefficient
numerical simulation
作者简介
责任作者, 副教授, liuzhw@mail.tsinghua.edu.cn
