影响河流水质DO和COD变化规律的新探讨  

New Discussion on Changing Rules of DO and COD of River Water Quality Research

作　　者：臧海燕[1] 刘德富[1] 彭辉[1] 熊锐[1] 

机构地区：[1]三峡大学土木水电学院

出　　处：《灾害与防治工程》2005年第2期73-77,共5页Disaster and Control Engineering

摘　　要：Streeter-Phelps模型在某些特定水域的应用受到限制,其主要原因是复氧系数的取定多在水流速度较大情况下得到的,而未考虑水面波动对复氧系数的影响。另外,在实际研究过程中发现COD变化的规律出现异常:在离排污口相当远的水域,COD随时间变化趋势并不是指数衰减,而是在某个常值附近微小摆动,以往任何修正过的Streeter-Phelps模型都无法解释这个现象。经研究表明:考虑波动效应后,对复氧系数进行修正能得到较好的模型计算结果;同时,COD变化规律不仅可以弄清楚,而且可以为进一步研究排污规律和泥沙运动提供科学依据。In some special water areas the utility of Streeter-Phelps Model suffers limitation because confirming re-aeration coefficient often comes from tests in rivers with fast water flow speed rather than considering the wavy effects. Furthermore, in factual research the changing rule of COD appears abnormity. In some water areas far from pollution source the value of COD changing with time doesn't accord with exponential attenuation rule but slightly sways in a certain value. This phenomenon can not be explained by former modified Streeter-Phelps models. After research it indicates that through modifying the re-aeration coefficient good calculation results will be obtained. Similarly, the changing rule of COD not only can make clear but also provide scientific evidence to further studying rules of pollution ejection and sediment motion.

关 键 词：Streeter-Phelps模型 复氧系数 水面波动 溶氧浓度 

分 类 号：X522[环境科学与工程—环境工程]