连云港入海河流水质变化及评价

Changes in Water Quality of Rivers Entering the Sea in Lianyungang and Evaluation

基于“十三五”期间连云港市入海河流的水质监测数据,采用单因子评价法探讨连云港市15条入海河流的污染状况,采用Spearman秩相关系数法检验连云港市15条入海河流2016—2020年水质的相关系数和斜率,判断其是否有变化以及相应的变化程度。结果表明:2020年连云港市入海河流断面水质优Ⅲ比例达80%,符合Ⅳ类水质的断面有2个,符合Ⅴ类水质的有1个,无劣Ⅴ类断面,主要污染指标高锰酸盐指数、五日生化需氧量、化学需氧量、氟化物呈显著好转趋势,氨氮、总磷呈好转趋势。

Based on the water quality monitoring data of the rivers entering the sea in Lianyungang City during the 13th Five-Year Plan period,the single-factor evaluation method was used to explore the pollution status of the 15 rivers entering the sea in Lianyungang City,and the Spearman rank correlation coefficient method was used to test the correlation coefficients and slopes of the water quality of the 15 rivers entering the sea in Lianyungang City from 2016 to 2020 to determine whether there were changes and the corresponding degree of changes.The results show that in 2020,the water quality of the river sections in Lianyungang City reaches 80%,and there are 2 sections in line with Class Ⅳ water quality,1 section in line with Class Ⅴ water quality,and there is no poor Class Ⅴ section,and the main pollution indicators of permanganate index,five-day biochemical oxygen demand,chemical oxygen demand and fluoride show a significant improvement,and ammonia nitrogen and total phosphorus show an improvement.