| The installation of green roofs,high albedo roofs and solar roofs can alleviate the energy crisis caused by urbanization and the destruction of urban thermal environment.In this study,the parameterization scheme of solar panels was added to the WRF model,and the effects of high albedo roofs,green roofs and solar roofs in summer on summer high temperature,winter meteorological factors and strong convective precipitation in summer were analyzed.The results show:(1)In summer,high albedo roofs,green roofs and solar roofs can reduce the near-surface temperature.The high albedo roof mainly reduces the solar short-wave radiation in the heated urban area by increasing the albedo.The average temperature is reduced by 0.6°C when the albedo is 0.8.The solar panel converts the received short-wave radiation into electrical energy to cause cooling,and the solar roof with a power generation efficiency of 60% can reduce the average temperature of 2 m by 0.5 ?;The green roof changes the energy distribution by evaporation to reduce the sensible heat,thus reducing the near-surface temperature.The 100% covered green roof reduces the average temperature of 2 m by 0.5 °C.In winter,solar panel roofs and high albedo roofs cool the near-surface temperatures,and green roofs cause nighttime near-surface temperatures increases and the temperature difference between day and night decreases.(2)In summer,high albedo roofs,green roofs and solar roofs can reduce daytime temperatures below 800 m in the boundary layer.The green roof cooling effect is most significant at 0.6 °C;nighttime temperature drop is 0.1 °C.The high albedo roof and solar roof in winter resulted in a significant temperature drop of 400 m in the boundary layer,the solar panel with a power generation efficiency of 60% decreased by a maximum of 0.4 °C,the albedo with a albedo of 0.8 reduced by 0.5 °C,and the 100% covered green roof.The temperature is raised in the boundary layer from 7:00 to 10:00,and the temperature is lowered from about 0.1 to 0.2 °C from 11:00 to 15:00.The installation of three roofs can reduce the height of the summer and winter boundary layers;in summer,the solar roof with 60% power generation can reduce the height of the daytime boundary layer by about 200 m,and the high albedo roofs and green roofs also reduce the boundary layer height by 300 m.(3)In summer,the installation of all three roofs can improve the comfort of the human body,and the green roof is most effective for improving the comfort of the human body.In winter,the effects of the three roofs on human comfort during the day are basically the same,but the green roof will greatly increase the comfort of the human body at night.(4)When the solar panel power generation efficiency is 40% in summer,the power generation is 6.3 T·Wh,which offsets the electricity consumption of the whole society during the simulation period;the solar panels with 40% power generation efficiency in winter can basically offset the electricity consumption of the whole society,but the precipitation Due to the reduced amount of radiation during the weather,solar panels generate less power and cannot offset social power consumption.(5)Solar roofs with 20% power generation efficiency will increase the cumulative precipitation in urban areas,while solar roofs with 40% and 60% power generation efficiency have no significant impact on urban cumulative precipitation.High albedo roofs with different albedo and different proportions of green roofs will change the precipitation range and precipitation center of urban area,but there is no good consistency. |
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