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Abstract
By extracting and simplifying the characteristics of commercial streets with arcades (Qilou) in Nanning, the tissue map of Qilou streets which reflects the urban morphology, including the road network form, block scale, building scale and other characteristics in a hot and humid area is obtained. In addition, the sunshine simulation is performed by using sunshine design software in an environment comprising streets with arcades to simulate street sunlight environments under various conditions. The relationship among street height-to-width ratio, sunshine hours, and street orientation angle is achieved by nonlinear fitting analysis. Then, a model is established to adjust the street height-to-width ratio based on sunshine requirement and street orientation. The finding indicated that when the street is north–south, it is suggested that the street height-to-width ratio is 0.95–1.13 to reduce sunshine hours effectively, and when the street is east–west, it is proposed that one side of the street should have a recessed space to improve the thermal conditions. The results of this study can serve as the specific guidelines that can be adopted in the redesign and reformation of commercial streets with arcades to achieve thermal comfort of Qilou streets in hot and humid areas.
Highlights
Streets are the basic organizational units of urban structure and city life, and the patterns of the streets affect their thermal environment
Understanding the relationships among the parameters such as the height-to-width ratio of buildings along a street, sunshine hours and street orientation will enable improved thermal environments to be incorporated into city design and planning
As available solar radiation measured data do not meet the needs of Qilou street redesign, by analyzing the sunshine conditions on summer days for Qilou streets in the traditional commercial area of Nanning, this study explores the relationship among street height-to-width ratio, sunshine hours and street orientation, since it greatly influences the thermal comfort and urban heat island mitigation (UHI) mitigation of urban commercial block
Summary
Streets are the basic organizational units of urban structure and city life, and the patterns of the streets affect their thermal environment. Street heightto-width ratio, orientation, and other urban morphology features affect the thermal environment [1,2,3,4,5]. Creating a comfortable thermal environment for streets is one of the demands and significant goals for forming virtuous city-pattern organizations [6]. Understanding the relationships among the parameters such as the height-to-width ratio of buildings along a street, sunshine hours and street orientation will enable improved thermal environments to be incorporated into city design and planning
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