摘要
利用汉江中下游干流河段例行监控断面2001-2011年水质监测资料中的高锰酸盐指数、氨氮和总磷3项水质指标,对汉江中下游干流水质状况、时空变化趋势进行分析和评价。研究结果表明:(1)汉江中下游干流水质总体状况良好,除罗汉闸断面总磷为Ⅲ类,其余断面各项水质指标均为Ⅱ类;(2)2001-2011年,沈湾、罗汉闸断面氨氮浓度显著下降趋势;余家湖断面高锰酸盐指数、氨氮和总磷浓度显著下降趋势;泽口断面高锰酸盐指数浓度显著下降趋势;(3)汉江干流河段高锰酸盐指数、氨氮和总磷等3项水质指标在白家湾断面以上相对较低,余家湖断面以下相对较高,中游河段水质优于下游。
Analyzing and estimating the quality and the spatial and temporal variation trend of the middle and lower reaches of Hanjiang River mainstream by using routine monitoring data of the concentration of permanganate index, ammonia nitro-gen and total phosphorus in 2001-2011. The results showed that:(1)the water quality of middle and lower reaches of Han-jiang River mainstream was good on the whole and the water quality index concentrations are Ⅱclass except the concentration of total phosphorus was Ⅲ class in Lohan Brake section;(2)In 2001-2011, the concentration of ammonia nitrogen declined significantly in Shenwan and Lohan Brake monitoring section; the concentration of permanganate index, ammonia nitrogen and total phosphorus declined significantly in Yujiahu monitoring section; the concentration of permanganate index declined significantly in Zekou monitoring section;(3)the concentration of permanganate index, ammonia nitrogen and total phosphorus was lower above Baijiawan monitoring section relatively and was higher below Yujiahu monitoring section relatively, the wa-ter quality was better in middle reaches of Hanjiang River than of the lower reach.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2016年第S1期428-432,共5页
Environmental Science & Technology
关键词
汉江中下游
水质
变化趋势
middle and lower reaches of Hanjiang River
water qualiy
variation trend
