沣河2001—2009年水质变化特征

利用沣河沣峪、沣河口、严家渠、三里桥4个监测断面2001—2009年的水质监测资料和沣河秦渡镇的水文资料,采用季节性Kendall检验方法,对CODMn、BOD5和NH3-N的变化趋势进行分析。结果表明:中上游监测断面的水质变化趋势不显著,下游断面的CODMn、BOD5和NH3-N均呈显著减小趋势;整条河流的CODMn、BOD5和NH3-N均显著减小,年平均减小速率分别为0.5460、.330、0.031 mg/L;水质变化主要是由入河污染物量的变化引起的,受流量的影响相对较小。

Characteristics of Water Quality Change During 2001 -2009 of Fenghe River

Changes of the concentrations of CODMn,BOD5 and NH3-N at 4 main sections of Fenghe River were identified by seasonal Kendall test based on its water quality and hydrological data of Qindu town during 2001-2009.The results show that the water quality parameters do not display a significant trend at 2 monitoring sections of the middle and upper reaches,while the concentrations of CODMn,BOD5 and NH3-N show a significant decreasing trend at 2 monitoring sections of the lower reach;the Regional Kendall test of Fenghe River shows a consistent decreasing regional trend,the estimated average decreasing rate of CODMn,BOD5 and NH3-N are 0.546mg/L,0.330mg/L and 0.031 mg/L per year,respectively;the water quality change is mainly influenced by the change of waste discharge,while there is only a little relationship existed between water quality change and flux from up-stream.