宝鸡主要河流水环境质量状况及变化趋势分析

Analysis on Change Trend of Water Environment Quality in Main Rivers in Baoji

通过对2006～2011年宝鸡主要河流嘉陵江、渭河及其主要支流金陵河、清姜河、石坝河水质监测结果进行分析．采用综合污染指数法对宝鸡主要河流水质现状进行评价，结果表明五条河流均能达到相应功能区水质要求指标；从五条河流各段面水质变化情况来看，上游的水质比下游的好，下游断面水质虽没有超过相应标准，但部分污染指标还是接近标准限值；从年际变化来看，2009年以来这五条河流的水质成逐年好转趋势，各条河流的特征污染指标主要为化学需氧量、五日生化需氧量、氨氮和挥发酚。

This paper uses compressive pollutants assessment approach and the monitoring data to evaluate the water quality of Baoji city five main rivers, namely Jianglingjiang River, Weihe River, and three branch rivers, that is Jinliangjiang River, Qingjianghe River and Shibahe River. The results show that the water quality reaches the related standard. The upstream water is better than the downstream. While the downstream water quality reaches the tandard, some pollutants are up to the standard limitation. From year 2009 on, the five river water quality is better than before, and the key pollutants are COD, BOD5 , NH3 -N and phenol.