Different Greening Schemes for Numerical Simulation Research on Summer Thermal Environment in Guangzhou Campus

Reasonable greening design can alleviate campus heat environment issues. This study uses the ENVI-met numerical model, combining observation and simulation methods, to analyze the thermal environment of three different greening schemes in typical areas of Guangzhou University campus. The results indicate that the outdoor thermal environment is significantly influenced by the underlying surfaces and vegetation. The temperature of brick-paved surfaces is 0.9°C higher than that of natural soil surfaces under tree shade. Numerical simulations also confirm that increasing the vegetation greening rate can effectively reduce outdoor air temperatures. When the greening rate increases to 40%, the outdoor average temperature decreases by 0.7°C, the relative humidity increases by about 4%, and wind speed shows little change. The cooling effect of vegetation extends up to 13 meters. As the greening rate increases (15%-40%), the average MRT (Mean Radiant Temperature) decreases from 50.6°C to 28.9°C, which is lower than the average ambient temperature, indicating better thermal comfort. The PET (Physiological Equivalent Temperature) decreases from 40.2°C to 30.0°C, with the proportion of "very hot" areas reducing by 36.8%, significantly improving thermal comfort in most areas. Therefore, changing the ground material and greening landscape design can effectively alter the outdoor wind and thermal environment of the campus, thereby affecting the thermal comfort of teachers and students.