嘉陵江西河水体2013年冬季COD分布特性及其成因探讨

The Distribution Characteristics of COD of Nan Chong West River System in Winter in 2011 and the Causes

西河不仅是嘉陵江的的重要支流,更是革命老区南充的母亲河.由于城市工业化及人口的增加,生活污水、工业废水和垃圾总量成倍增长,直接构成对西河的严重污染,尤其是COD污染.作者通过对西河流经市区流域上中下游四个监测断面共8个监测点进行的监测调查,运用内梅罗指数法和变异系数法评价分析了COD变化规律、发展趋势及其成因.结果显示:西河COD污染严重,Ⅴ类水质超标率高达100%以上,各断面之间COD含量差异显著,断面层内COD含量变化幅度较大,区域含量变化呈西北部向东南部先逐级递增后逐渐递减以及近岸水域大于远岸的趋势.

The West River is not only the branch of the Jialinjiang River, but also the mother river of Nanchong. With the industrialization of urbanization and the sharply increasing inurban population, rapid growth in total amount of sewage, industrial waste water and garbage have polluted the West River seriously, especially COD pollution. In this paper, a total of eight monitoring points on the basin of the West River through the urban middle and lower rea- ches of the four monitoring sections were monitored. The Nemerow index and coefficient of variation method were used to evaluate and analyze the COD variation and development trend as well as the causes, which can provide ad- vice and basic data for the West River pollution prevention. The results showed that the river was seriously pollu- ted, and grade of V exceeded the rate of 100%. The difference of the COD content was significant among each sec- tion, and the COD content has big variations in the fauh plane. The regional content of COD gradually decreased from northwest to southeast, and the COD content of coastal waters was greater than that of the far shore.