近十年淮河流域化学需氧量和氨氮浓度变化特征

发布时间：2018-01-28 13:08

本文关键词： 淮河流域化学需氧量氨氮变化特征　出处：《节水灌溉》2016年12期 　论文类型：期刊论文

【摘要】：采用国家地表水环境质量监测网2006-2015年的数据,对淮河流域近十年地表水主要减排指标化学需氧量和氨氮浓度的变化特征进行了初步分析。结果表明:淮河干流水质优于主要支流和沂沭泗水系。淮河干流和主要支流的化学需氧量年均浓度呈现波动变化,氨氮年均浓度则均呈现显著下降趋势;而沂沭泗水系的化学需氧量和氨氮年均浓度均呈现显著下降趋势。淮河干流、主要支流和沂沭泗水系的化学需氧量浓度年内变化和季节没有特别明显的相关性;氨氮浓度年内变化则呈现出相似的季节变化特征,丰水期浓度低于枯水期浓度。污染物排放量的逐年递减是淮河流域近十年地表水质改善的重要原因。
[Abstract]:Data from the National Surface Water Environmental quality Monitoring Network for 2006-2015 are used. The variation characteristics of chemical oxygen demand (COD) and ammonia-nitrogen concentration (NH3-N) in surface water of Huaihe River basin in recent ten years are analyzed. The results show that:. The water quality of the main stream of the Huaihe River is better than that of the main tributaries and the Yishusi River system. The average annual concentration of the chemical oxygen demand of the main stream and the main tributary of the Huaihe River fluctuates. The average annual concentration of ammonia nitrogen decreased significantly. However, the chemical oxygen demand (COD) and the average annual concentration of ammonia and nitrogen in the Yishusi River showed a significant downward trend. There was no significant correlation between the annual variation and the season of the concentration of COD in the main stream, the main tributary of the Huaihe River and the Yishu River system. The annual variation of ammonia nitrogen concentration shows a similar seasonal variation, and the concentration in high water period is lower than that in dry season, and the decrease of pollutant discharge is an important reason for the improvement of surface water quality in Huaihe River Basin in recent ten years.
【作者单位】：中国环境监测总站;国家投资项目评审中心;
【分类号】：P343.1
【正文快照】： 淮河流域面积约为27万km2,以废黄河为界,分成淮河和沂沭泗两大水系,流域面积分别为19和8万km2。涉及湖北、河南、安徽、江苏和山东5省。流域多年平均年降水量为875mm,多年平均地表水资源量约为595亿m3。流域降水分布不均,6-8月降水最多,集中了全年的40%~65%。淮河流域总面积占

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