港池内水溶性和悬浮性物质水交换能力研究  

Water exchange capability of the soluble substance and the suspended particle in a harbor

作　　者：杨舒奕 赵树明[1,2] 尤学一[1] YANG Shu-yi ZHAO Shu-ming YOU Xue-yi(School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China Tianjin Urban Planning and Design Institute, Tianjin 300201, China)

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]天津城市规划设计研究院,天津300201

出　　处：《安全与环境学报》2016年第6期332-336,共5页Journal of Safety and Environment

基　　金：天津市滨海新区科技计划项目(2012-XJR23017)

摘　　要：港池内外水交换能力是关系到海港水环境的主要因素,以天津南港东港池为例,应用环境流体水动力学模型EFDC,采用大、小2层模型嵌套方式,构建了天津港及南港水动力模型。采用保守性示踪剂输运扩散法及粒子追踪2种方法,研究不同特性(水溶性、颗粒)污染物在港池的水交换能力,计算了各子区域的水体更新时间及粒子驻留时间,得到各子区域水交换能力。结果表明,南港东港池口门及中部区域水交换能力较强,港池底部水交换能力很弱。对于可溶性组分来说,西侧水体更新能力强于东侧;对于悬浮性组分来说,东侧水体中悬浮物比西侧更容易交换至外海,港池内可溶性物质的交换能力要强于悬浮性颗粒。This paper deals with a study of the water exchange capability of the different kinds of pollutants in a harbor by taking the east basin of Nangang harbor in Tianjin as a case study sample to build our multi-nested grid model. Since the sea water exchange capacity is an important indicator of the physical self-purification ability for the marine area, the present study is expected to offer a great help for the evaluation and prediction of the marine environment quality. In hoping to realize the hydrodynamic high-resolution simulation of the port, the open boundary condition of Nangang harbor has been obtained from the simulated result of outer model. In our study, we have adopted the method of conser- vative tracer transport diffusion and the particle tracking to study the water exchange capacity of different kinds of pollutants, with the water exchange capacity obtained by calculating the water update time and residence time of the particles. The results of our study show that the water exchange capacity of the entrance part and middle part in the east basin is stronger whereas the tail part turns to be weaker. The results of our measurement of the different features of the pollutants exchange capacity show somewhat difference. Furthermore, we have found that the water renewal ability of the western part turns to be better than that of the eastern part for the soluble substance and the descending order of the water exchange ability in each subareas： Ⅰ〉 Ⅲ〉 Ⅱ〉 Ⅳ 〉Ⅴ 〉 Ⅵ. In comparison with the suspended solids in the eastern part, it would be easier for the water to exchange to the coast than those in the western one and the diffusion ability of the suspended particle in each subarea proves also in a descending order as Ⅱ〉 Ⅰ〉 Ⅵ 〉Ⅲ 〉 Ⅴ 〉 Ⅵ.Thus, it can be seen that the exchange capacity of the soluble substance is better than the suspended particles there in the harbor.

关 键 词：环境学 EFDC模型 水交换 示踪剂扩散 粒子追踪 

分 类 号：X55[环境科学与工程—环境工程]