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

Table 6

The normalized value of original variables.

	ZpH	ZDO	ZCODMn	ZCODCr	ZBOD5	ZNH3-N	ZTP	ZTN	Z_rs
Qihe River	0.03	0.37	−0.76	−0.70	−0.70	−0.51	−0.63	−0.62	−0.55
Baihe River	0.33	0.39	−0.81	−0.76	−0.84	−0.53	−0.55	−0.72	−0.55
Duhe River	0.09	0.23	−0.55	−0.59	−0.67	−0.49	−0.55	−0.65	0.00
Tianhe River	0.93	0.94	−0.44	−0.44	−0.32	−0.27	−0.05	−0.41	−0.55
Langhe River	−0.45	−0.39	0.00	−0.01	−0.32	−0.43	−0.55	−0.33	0.55
Shending River	−1.77	−1.88	1.98	2.07	2.49	2.60	2.29	2.36	−1.10
Sihe River	−2.49	−2.39	1.96	2.05	1.89	2.44	2.63	2.10	−0.55
Jianhe River	1.53	0.73	1.07	1.44	1.01	−0.30	−0.21	−0.12	−0.55
Jiangjun River	0.63	0.75	−0.52	−0.62	−0.54	−0.49	−0.38	−0.59	2.19
Taohe River	0.39	−0.09	−1.05	−0.80	−0.71	−0.51	−0.72	−0.81	−0.55
Taogou River	0.39	1.30	−0.69	−0.66	−0.64	−0.52	−0.63	−0.92	0.00
Quyuan River	0.39	0.32	−0.77	−0.64	−0.46	−0.26	−0.05	−0.04	−1.10
Xianghe River	0.87	0.31	−0.86	−0.78	−0.62	−0.48	−0.55	0.07	0.55
Laoguan River	−0.33	−0.80	0.66	0.25	0.54	0.08	−0.13	−0.03	0.55
Guanshan River	−0.63	−0.52	−0.07	−0.26	−0.41	−0.20	−0.21	−0.45	−0.55
Jianghe River	0.15	0.72	0.87	0.44	0.29	−0.14	0.29	1.16	2.19