A Comprehensive Method for Water Environment Assessment considering Trends of Water Quality

Table 8

Scores of the tributaries of the Danjiangkou Reservoir and pollution rankings.

Tributary	Score
	rs	Factor 1	Factor 2	PC1	PC2	Comprehensive	Ranking
Qihe River	−0.80	−0.734	−0.659	−1.92	−0.69	−1.75	14
Baihe River	−0.80	−0.807	−0.634	−2.11	−0.66	−1.91	15
Duhe River	−0.60	−0.577	−0.185	−1.51	−0.19	−1.33	11
Tianhe River	−0.80	−0.534	−0.209	−1.4	−0.22	−1.24	10
Langhe River	−0.40	−0.093	0.246	−0.24	0.26	−0.18	6
Shending River	−1.00	2.245	−0.921	5.88	−0.96	4.95	2
Sihe River	−0.80	2.296	−0.847	6.02	−0.88	5.07	1
Jianhe River	−0.80	0.268	0.585	0.7	0.61	0.69	5
Jiangjun River	0.20	−0.271	1.871	−0.71	1.95	−0.35	7
Taohe River	−0.80	−0.845	−0.801	−2.21	−0.84	−2.02	16
Taogou River	−0.60	−0.766	0.091	−2.01	0.09	−1.72	13
Quyuan River	−1.00	−0.583	−0.985	−1.53	−1.03	−1.46	12
Xianghe River	−0.40	−0.517	0.465	−1.35	0.48	−1.1	9
Laoguan River	−0.40	0.401	0.378	1.05	0.39	0.96	4
Guanshan River	−0.80	−0.250	−0.832	−0.65	−0.87	−0.68	8
Jianghe River	0.20	0.769	2.438	2.01	2.54	2.09	3