大鹏湾环境容量研究Ⅰ:自净能力模拟分析  

Studies on the environmental capacity of the Dapeng Bay,Part I:numerical study of water self-purification capacity

作　　者：夏华永[1] 李绪录[1] 韩康[2] 

机构地区：[1]国家海洋局南海工程勘察中心,广东广州510300 [2]国家海洋环境监测中心,辽宁大连110623

出　　处：《中国环境科学》2011年第12期2031-2038,共8页China Environmental Science

基　　金：我国近海海洋综合调查与评价专项(908-02-02-03)

摘　　要：在估算大鹏湾污染源强及统计海水污染物浓度的基础上,采用三维水动力模型及污染物扩散模型,模拟了大鹏湾的海水交换及污染物扩散过程,分析了大鹏湾海水交换与生化降解对自净能力的贡献.结果表明,大鹏湾潮差小,约为1m,潮流弱,污染物难于向湾外扩散,其物理自净能力差,湾内海水自净主要取决于生化降解.在吐露港海区与沙头角海区,污染排放较大,水深较小,海水难于交换,容易受到污染.Combined with estimation of the discharge fluxes of pollutant sources and statistical analysis of the pollutant concentration, this paper employed a 3D numerical model to simulate the pollutant transport and seawater exchange processes in the Dapeng Bay. The model results were utilized to calculate the seawater exchange rate and self-exchange period, and to analyze the contributions of seawater exchange and bio-chemical degradation to the self-purification in the bay. It was difficult for the pollutants inside the bay to transport out of the bay as the tidal range was as small as lm, and the tidal current was weak, thus the self-purification of the water in the bay relied mainly on the bio-chemical degradation, rather than on the seawater exchange between the inner bay and the outer bay. Both the water quality measurements and modeling results indicated that the waters in the Tolo Harbor and Shatoujiao were hard to be exchanged and susceptible to pollution due to large pollutant input and shallow water depth there.

关 键 词：大鹏湾 自净能力 扩散模型 海水交换 生化降解 

分 类 号：X26[环境科学与工程—环境科学]