城市河流大气复氧系数规律研究

An Experimental Study on Reaeration Coefficient in Urban River Water Bodies

以上海市的蒲汇塘河流为研究对象,通过环形水槽开展河水的静态大气复氧试验和动态大气复氧试验。静态条件下蒲汇塘河水的大气复氧系数为0.087 d^-1,动态条件下的大气复氧系数在4.83~48.68 d^-1 之间。将流速与复氧系数的试验测定值进行统计分析,得出二者呈幂函数关系,其表达式为k2=485.36 u^2.38。

Taking Puhuitang River in Shanghai as the research object, a series of steady and dynamic tests was carried out through an annular water tank. Under steady conditions, the reaeration coefficient in Puhuitang River water was 0.087 d^-1, whilst the range of that varied between 4.83 ~ 48.68 d^-1 under dynamic conditions. When current velocities and related observed values of reaeration coefficient in the tests were statistically analysed, it was concluded that there was a power function relation in between with the expression being as k2=485.36 u^2.38.