Simulation-Based Optimisation for Urban Environmental Noise Coupled with Auditory and Visual Subjective Evaluation

Table 4

The average equivalent sound level reduction of each area compared with the current simulation results under different optimisation measures (dB (A)).

Zone	Noise barrier					Greenbelt					Combination arrangement					Total
	Weekdays daytime	Weekdays nighttime	Weekends daytime	Weekends nighttime	Overlay	Weekdays daytime	Weekdays nighttime	Weekends daytime	Weekends nighttime	Overlay	Weekdays daytime	Weekdays nighttime	Weekends daytime	Weekends nighttime	Overlay
Campus	2.20	1.78	1.99	1.84	7.81	1.45	1.42	1.48	1.56	5.91	1.83	1.68	1.82	1.72	7.05	20.77
Sports zone	2.43	2.84	2.44	2.89	10.06	1.11	1.31	1.18	1.44	5.04	2.29	2.43	2.33	2.55	9.6	24.7
Teaching zone 1	3.40	3.09	3.22	3.18	12.89	1.14	1.12	1.10	1.20	4.56	3.65	2.83	3.49	2.91	12.88	30.33
Teaching zone 2	3.12	1.59	2.07	1.66	8.44	3.01	1.89	2.03	2.02	8.95	2.77	1.70	1.75	1.71	7.93	25.32
Library	1.55	2.55	1.55	2.61	8.26	2.99	2.90	3.02	3.00	11.91	2.65	1.43	2.66	1.46	8.2	28.37
Dormitory 1	2.23	0.59	1.61	0.61	5.04	0.90	0.89	1.04	1.04	3.87	0.65	1.14	0.67	1.15	3.61	12.52
Dormitory 2	1.44	1.55	1.44	1.63	6.06	1.95	1.78	1.85	1.94	7.52	1.51	1.12	1.56	1.12	5.31	18.89
Test zone	0.11	0.06	0.11	0.10	0.38	0.39	0.50	0.51	0.63	2.03	0.10	0.06	0.12	0.10	0.38	2.79