Analysis About Key Indicators of High Density Blocks in the New Central District from the Perspective of Mitigating Urban Heat Island: A Study at Guangzhou

Abstract

Blocks located in the new central district are characterized as high density. For a typical block in Guangzhou city measurement showed that during the summertime, heat island effect is a severe problem. Urban construction causes the formation of an urban heat island, and the statutory Regulatory Detailed Planning is the basis for both urban construction and government management. There is a certain relationship between the planning and heat island intensity. Key indicators of Regulatory Detailed Planning which affect heat island intensity were put forward. They were named Floor Area Ratio (FAR), Building Density(BD) and Greenery Ratio (GR). Related urban planning specification files of different cities were used for summarizing control requirements of the key indicators from the perspective of government management. These indicators were compared with the planning and the actual situation of new central district cases in Guangzhou city. Meanwhile, ENVI-met the numerical simulation software was employed, which accurately describes the urban micro-environment, quantifying the urban heat island effects of typical blocks. Through this quantitative process the respective contribution of the above key indicators to control heat island intensity was evaluated. The result showed that FAR and GR are outstanding in improving thermal environment.