胡莉 何文杰 董明君 陈昱霖

摘要 为了解倒水河红安段水质污染情况，以倒水河红安段为研究对象，通过水质监测，结合综合污染指数评价法，分析倒水河红安段水质时空变化特征及水质污染情况。主要的研究结果如下：倒水河红安段流域水体中COD、NH3-N、TP的浓度分别为5.92～24.56、0.06～3.52、0.00～0.99 mg/L，枯水期超标现象最严重，多出现在中下游的城关镇、高桥镇和八里湾镇。对倒水河红安段干流上的13个监测断面进行水质评价，发现倒水河红安段在枯、丰、平3个水期均存在不同程度的超标情况，其中以枯水期水质最差，丰水期和平水期较好。

关键词 倒水河;红安县;时空变化;水质评价;综合污染指数评价

中图分类号 X824 文献标识码 A

文章编号 0517-6611（2021）01-0070-03

doi：10.3969/j.issn.0517-6611.2021.01.018

Abstract In order to understand the water quality pollution situation of Daoshui River in Hongan County，this paper took Daoshui River in Hongan County as the research object，through water quality monitoring，combined with the comprehensive pollution index evaluation method，analyzed the temporal and spatial change characteristics of water quality and the status of water quality pollution in Daoshui River in Hongan County.The main research results were as follows：the concentration range of COD，NH3-N and TP in Daoshui Rivers basin in Hongan County was 5.92-24.56，0.06-3.52 and 0.00-0.99 mg/L，respectively.The phenomenon of exceeding the standard was the most serious in the low water period，and most of it occurred in Chengguan Town，Gaoqiao Town and Baliwan Town in the middle and lower reaches.The water quality of 13 monitoring sections on the main stream of Daoshui River in Hongan County was evaluated.It was found that the water quality of Daoshui River in Hongan County exceeded the standard in different degrees in dry，wet and normal periods，among which the water quality was the worst in dry period，and better in wet and normal periods.

Key words Daoshui River;Hongan County;Spatiotemporal variation;Water quality assessment;Comprehensive pullution index evaluation

倒水河起源于大別山南麓，全长163.3 km，流域面积1 793 km2。倒水河红安段自北向南流动，北从七里坪镇入境，南至太平桥镇出境，全长102.8 km，流域面积1 163.83 km2，占全流域面积的65%。倒水河是红安县的母亲河，备用水源地，同时兼具工农业用水、城市泄洪、服务周边居民活动需求等重要功能。倒水河是长江流域的重要支流之一，红安段设有1个国控水质监测断面[5]，为冯集断面，水质保护目标为Ⅲ类。以倒水河红安段为研究对象，通过对倒水河红安段流域水质监测和数据分析，明确其水质时空变化特征，从而为倒水河红安段污染治理提供科学依据，在长江大保护战略背景下，具有十分重要的现实意义[1-4]。

1 监测断面布置与水样采集

倒水河红安段流域涉及七里坪镇、杏花乡、华家河镇、上新集镇、城关镇、二城镇、高桥镇、永佳河镇、八里湾镇、觅儿寺镇和太平桥镇共11个乡镇。……