基于典型降雨TN入库过程的水库水质响应数值模拟分析  

Simulated research of reservoir water quality response under typical rainfall

作　　者：袁燕[1] 韩龙喜[1] 孙杨[1] 陈奇良[1] 程林[1] 王琰[1] 

机构地区：[1]河海大学环境学院,南京210098

出　　处：《安全与环境学报》2014年第3期189-193,共5页Journal of Safety and Environment

基　　金：水利部公益性行业科研专项(201101031)

摘　　要：以东北某大型水库为例,应用MIKE3软件,根据夏季典型降雨入库过程,模拟了水库水动力场。根据面源污染物入库质量浓度的时间变化特征,以TN为代表因子,对TN入库的动态过程进行了三维数值模拟。结果表明:面源污染物TN质量浓度与降雨量和入库流量有较强的相关关系;强降雨初期是面源污染的高峰期;在空间分布上,TN污染团中心在12 h、42 h、60 h、78 h时迁移扩散至入库口下游0.42 km、2.25 km、3.33 km、4.04 km;在时间尺度上,TN表层在对应时刻超标范围分别为0.98 km2、2.72 km2、3.71 km2、4.77 km2,污染团中心的质量浓度逐渐降低,分别为3.6 mg/L、3.1 mg/L、2.5 mg/L、2.1 mg/L。The article presents a new approach to coping up the sudden non-point source pollution during the summer typical rainfall. In recent years, random source pollutions have taken place in different parts of China, bringing about severe impacts on the water source quality, which makes it of great importance to study the pouring and diffusion of sudden non-point source pollution so as to effectively control such unwanted disasters. This paper has taken a large reservoir in Liaoning, a northeast province in China as a a case study sample. In doing so, we have adopted a software known as MIKE3 to simulate the hydrodynamic field of reservoirs based on the rainfall process with the observed data collected in 2012. Taken into full account of the temporal weather change factors of the random source pollutant concentration, we have taken a 3D hydrodynamic water quality model to perform our simulation of the dynamic process of TN＇s migration and diffusion. The results of our simulation indicate that the TN concentration tends to be highly correlated with the rainfall and inflow water volume in correlated coefficient figures of 0.709 8 and 0.643 respectively. At the beginning stage of a heavy rain there used to be a peak period of non-point source pollution. The spatial distributions of the polluted cluster central downstream in the reservoir were 0.42 km, 2.25 km, 3.33 km and 4.04 km which were supposed to be corresponding to intervals of 12 h, 42 h, 60 h and 78 h after raining in the area under study. Temporally speaking, the area of TN＇s surface layers that exceeded the standard level were supposed to be 0.98 km^2 , 2.72 km^2 , 3.71 km^2 and 4.77 km^2 , respectively. And, in turn, the concentrations of the polluted cluster centers would be 3.6 mg/L, 3.1 mg/L, 2.5 mg/L and 2.1 mg/L. Thus, knowing thoroughly the reservoir water volume quantitatively in situ as well as the spatial distribution of pollutants through the numerical simulation can surely help to provide a scientific support decision for non-point source contro

关 键 词：环境工程学 典型降雨 TN 水库 三维 数值模拟 面源 

分 类 号：X524[环境科学与工程—环境工程]