东江中上游主要控制断面水质变化特征

The characteristics of water quality change for the main control sections in the middle and upper reaches of East River

根据2001-2007年东江干流中上游博罗站、河源站和龙川站的监测资料,采用季节性Kendall检验方法,对CODMn、BOD5和NH3-N等水质参数的浓度变化趋势进行分析,结果表明:(1)3个断面的BOD5浓度都呈高度显著上升趋势;(2)龙川断面CODMn和NH3-N的浓度变化不显著,而河源和博罗断面CODMn的浓度呈显著下降趋势、NH3-N浓度呈显著上升趋势;(3)中游主要控制断面水质变化速率大于上游;(4)水质变化受流量的影响相对较小,主要是由陆域污染物排放量的变化所引起的.

Changes of the concentrations of CODMn, BOD5 and NH3-N from main sections of the middle and upper reaches of East River were identified, by using the method of seasonal Kendall test for water quality data from Longchuan, Heyuan and Boluo monitoring stations during 2001-2007. The results suggest that： （1） the concentrations of BOD5 increase significantly at all stations; （2） the concentrations of CODMn and NH3-N do not display a significant trend at Longchuan control section, and the concentrations of CODMn showed a decreasing trend and NH3-N showed an increasing trend at both Heyuan and Boluo control sections; （3） change in the rate of water quality from the middle reaches is larger than that from the upper reaches; （4） the water quality change is mainly influenced by the change of waste discharge.