孙志林,杜利华,龚玉萌,郑佳芸,方诗标.长江口和杭州湾污染物稀释扩散及交汇数值模拟研究[J].海洋工程,2019,37(2):68~75
长江口和杭州湾污染物稀释扩散及交汇数值模拟研究
Numerical simulation of contaminant dilution and diffusion and convergence in Yangtze River estuary and Hangzhou Bay
  
DOI:10.16483/j.issn.1005-9865.2019.02.008
中文关键词:  长江口  杭州湾  污染物稀释扩散  交汇  径流量  水质模型
英文关键词:Yangtze River estuary  Hangzhou Bay  contaminant dilution and diffusion  converge  runoff  water quality model
基金项目:国家基金重大研究计划项目(91647209);国家重点研发计划(2016YFC0402305-02);国家水体污染控制与治理科技重大专项(2009ZX07424-001)
作者单位E-mail
孙志林 浙江大学 海洋学院浙江 杭州 310058 21534056@zju.edu.cn 
杜利华 浙江大学 海洋学院浙江 杭州 310058  
龚玉萌 浙江大学 海洋学院浙江 杭州 310058  
郑佳芸 浙江大学 海洋学院浙江 杭州 310058  
方诗标 浙江大学 海洋学院浙江 杭州 310058  
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中文摘要:
      河口水体中污染物稀释扩散是近海水环境研究的关键问题之一。针对长江口和杭州湾的污染物稀释扩散与交汇,利用有限体积法,建立了大范围二维潮流水质数学模型,结合拉格朗日法粒子追踪技术,模拟了不同径流下两河口的污染物(COD)稀释、扩散和交汇。结果表明,长江口石洞口排放的污染物口内经过10次往复运动,历时5天扩散至口门处,随后部分进入外海,另一部分经过6天扩散至杭州湾水域;杭州湾金山排放的污染物历时10天向上下游扩散约28 km,同时由北岸向南扩散约15 km。在各排污口同时排放COD浓度为100 mg/L的污水,交汇处COD达到相对稳定后,浓度增量约为1.2 mg/L,受长江口和杭州湾的影响之比约为5∶1。对不同径流量下COD稀释扩散进行模拟,得出径流量增大有助于污染物的稀释扩散。
英文摘要:
      Dilution and diffusion of pollutants in estuary is one of the key issues in offshore water environment research. In order to understand the dilution, diffusion and convergence of pollutants in the Yangtze estuary and Hangzhou bay, a two dimensional water quality model is established based on finite volume method. In addition, a Lagrangian particle tracking technology is used to simulate the dilution, diffusion and convergence of the contamination (COD) in the two estuaries under different runoffs. The results show that the pollutants discharged from the Shidongkou at the Yangtze River estuary experience 10 times of reciprocating motions, which spread to the mouth after 5 days, and then some of them enter the outer sea, the others spread to the Hangzhou Bay after 6 days; the pollutants discharged from Jinshan spreads to about 28 km in both upstream and downstream directions after 10 days, and spread to about 15 km from the north bank to the south simultaneously; when all outlets discharge sewage with COD concentration of 100 mg/L at the same time, the COD concentration increases to around 1.2 mg/L at the junction, which is about 5∶1 by the influence of the Yangtze River estuary and Hangzhou Bay. In addition, the COD dilution and diffusion under different runoffs are simulated, and the results indicate that the increase of runoff helps the pollution to spread.
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