汉江干流水质现状与变化趋势分析

对汉江干流水质现状进行了分析评价并探讨了主要监测指标的变化趋势。指出汉江水质以 、 类为主,总体较好,襄樊白家湾以上河段的水质明显好于下游河段,水质相对较差的断面主要是城镇控制断面。汉江主要污染物是总磷。水质在不同水期的变化为:平水期好于丰水期,丰水期好于枯水期。16年间,高锰酸盐指数和氨氮分别有37.5%和25%的断面年均值呈上升趋势。

The Water Quality and Change Tendency Analysis for Hanjiang River Trunk Stream

This paper presents the present status and change tendency for trunk stream of Hanjiang River. The monitoring data shows that water quality of the River in general is quite good and meets the class II and III of National Surface Water Criteria. The water quality in upper reaches of Baijiawan Section, Xiangfan is evidently better than that in lower reaches. Relative poorer water quality sections are mainly located within cities and towns, and with total phosphorus as major pollutant. The water quality in different water seasons changed as mean season better than wet season and wet season better than dry season. 16 years' data shows that 37.5% and 25% sections for annual average value of permanganate and ammonia nitrogen is increasing.