Reduction of Waste Water in Erhai Lake Based on MIKE21 Hydrodynamic and Water Quality Model

Table 4

The reductions of pollution load in Erhai Lake 𝑡/𝑎.

Hydrological period number	Wet period			Normal period			Dry period
	TN	TP	CODcr	TN	TP	CODcr	TN	TP	CODcr
1	70.74	3.64	—	44.43	1.67	—	16.74	0.75	39.65
2	317.37	27.24	—	187.45	17.88	—	92.69	5.23	186.02
3	39.75	1.37	—	29.02	0.74	—	13.32	0.33	24.38
4	54.01	4.03	—	43.36	2.09	—	17.01	1.02	23.77
5	20.64	2.00	—	15.80	1.26	—	7.54	0.62	13.54
6	36.37	1.25	—	29.61	1.51	—	10.32	0.60	10.35
7	177.96	14.88	—	146.67	9.69	—	52.09	4.02	59.90
8	54.04	3.69	—	44.62	3.15	—	31.39	1.65	18.09
9	9.19	1.01	—	6.87	0.95	—	4.72	0.48	5.39
10	13.33	1.58	—	9.83	1.04	—	6.68	0.49	7.67
11	10.45	1.46	—	8.08	1.09	—	5.65	0.49	3.65
12	16.02	1.36	—	12.81	1.67	—	8.55	0.70	6.84
13	30.13	2.85	—	24.38	2.48	—	17.11	1.25	23.95
14	21.44	1.82	—	16.77	2.02	—	11.74	0.95	14.15
15	18.36	1.95	—	14.73	1.61	—	10.45	0.73	8.35
16	10.38	0.84	—	7.60	0.49	—	4.87	0.25	2.26
17	12.93	0.81	—	9.26	1.06	—	6.41	0.48	4.01
18	17.69	0.90	—	12.26	1.09	—	7.54	0.49	6.18
19	9.42	0.78	—	6.98	0.62	—	4.51	0.30	3.58
20	12.36	1.42	—	8.20	0.93	—	5.52	0.43	4.97
21	11.36	1.20	—	8.37	0.82	—	5.60	0.44	9.91
22	27.59	2.13	—	17.38	1.14	—	11.27	0.65	14.30
23	32.39	3.51	—	22.38	2.76	—	14.95	1.32	21.43
24	15.13	1.64	—	10.67	1.20	—	7.43	0.65	10.71
Total	1039.04	83.38	—	737.90	59.32	—	374.07	24.32	523.05

“—” is Δ𝑄_𝑖<0, and the amount of pollutants into lake is less than water environmental capacity.