Analysis of water pollution load in Qinghai Yellow River basin and the concentration variation of nitrogen and phosphorus based on PCA
Based on the water quality data of five monitoring sections in the Qinghai section of the Yellow River Basin in 2023,the principal component analysis of the five water quality monitoring indicators of pH,turbidity,permanganate index,total phosphorus and total nitrogen was carried out to calculate the comprehensive score of the principal component of sections.Water quality change trend of sections was obtained by Spearman rank correlation analysis method.Pollution load and variance contribution of index to the principal component of each section was analyzed,then factors with higher contribution rate were obtained.In dry season concentration variation of the fac-tors was analyzed,as well as in normal season and wet season.The results showed that water quality factors have a small variation in Qinghai Yellow River Basin.The five sections of water pollution ranked from heavy to light,Za-malong>Runze Bridge>Thar Bridge>Jintan>Ganchongkou.Except the water quality of Jintan showed a sta-ble trend,and the concentration of water pollution in other sections increased with season.The indicators with the highest contribution rate to pollution were total phosphorus,total nitrogen and permanganate index.The total phos-phorus concentration and permanganate index concentration was generally higher in autumn than in spring.The dis-tribution of total nitrogen concentration in normal season,wet season and dry season were different.
万方数据
维普
