Effects Of Road Geometry And Roadside Trees On Urban Road Thermal Performance In Penang

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Date
2016-06
Authors
Mirzaei, Nasibeh Faghih
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Abstract
This research investigates the effects of the physical road characteristics and roadside tree features on the road thermal performance in Penang, Malaysia; located in tropical region where there is high solar radiation intensity. The variables of urban road features studied include road width and road orientation. Accordingly, the effects of physical properties of roadside tree takes to accounts, including tree position, tree height, canopy density and tree distance from the road edges. The research methodology is quantitative in nature via fieldwork measurements to assess the road thermal performance. The study measures road surface temperature and air temperature above road surface in accordance with research objectives and hypotheses. The research findings illustrated the significant effects of road and tree characteristics on road surface temperature and air temperature. Based on road orientation and width, North West-South East wide roads had the highest average surface temperatures. However, North-South oriented narrow roads provide a better urban road microclimate. Moreover, tall trees with dense canopy had the most significant effect on road surface temperature reduction by providing high quality shade. The results also revealed remarkable differences of road thermal performance between road with trees and without trees. Finally, the conclusion from the potential cooling effects of roadside trees and road characteristics on the road thermal performance can be implemented as a guideline of urban road design in modification road microclimate in urban tropical region.
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The effects of the physical road characteristics and roadside tree features , on the road thermal performance in Penang,
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