Spatiotemporal Variation Characteristics of Water Pollution and the Cause of Pollution Formation in a Heavily Polluted River in the Upper Hai River

Table 4

Rotated component matrix and contributions of pollutant sources in the flood season.

Parameters	Variance factors (VFs)			Contribution percentage (%)			R^2
	VF1	VF2	VF3	VF1	VF2	VF3
pH	−0.825	−0.391	−0.214	57.68	27.36	14.96	0.88
DO	−0.698	−0.031	−0.660	51.39	—	48.61	0.92
CODCr	0.655	0.536	0.374	41.83	34.28	23.88	0.86
BOD5	0.210	0.902	0.182	18.91	81.09	—	0.86
NH3–N	0.327	0.152	0.922	23.32	10.87	65.80	0.98
TP	0.784	0.265	0.420	53.40	18.04	28.56	0.86
F^−	0.239	0.920	0.013	20.62	79.38	—	0.90
Total variance (%)	34.57	31.35	24.00	—	—	—	—
Cumulative variance (%)	34.57	65.92	89.92	—	—	—	—