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Title:

A Study of Pavement Temperature and Near-Surface Thermal Environment: Field Experiment and Numerical Simulation

Accession Number:

01514921

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

In the process of urbanization, many natural surfaces are replaced by pavements. The interaction between pavement and urban climate leads to the dynamic change of pavement temperature field and near-surface thermal environment. This paper presents an investigation of pavement material properties on the near-surface thermal environment using both field experiment and numerical modeling. Considering the pavement and near-surface atmosphere as an interactive system, a three-dimensional numerical model was developed. The numerical model was validated using measured data from an experiment field. Then, the influence of pavement area, albedo(or reflectivity) and wind velocity on the near-surface air temperature was analyzed. Results show that when the wind speed is low, the air temperature difference (ΔTa) between a normal asphalt pavement surface and a reflective coating surface at 0.5m and 1.7m above the surface could reach 1.6° and 0.7°,respectively. When the albedo is the same, ΔTa increases with the increase of pavement area. However, when the pavement area is the same, ΔTa decreases with the increase of surface albedo, and there is a linear relationship. Moreover, a 3m/s boundary velocity, which can accelerate remarkably the heat exchange on top of two different pavements, is proposed. Practically, this indicates that the heat circulation between urban and suburban could be accelerated when the rural wind velocity reaches 3m/s or above. Thus, the city thermal environment could be improved and the effect of urban heat island be reduced.

Supplemental Notes:

This paper was sponsored by TRB committee AF000(2) Pavement Materials and the Urban Climate.

Monograph Accession #:

01503729

Report/Paper Numbers:

14-2760

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Zou, Xiaoling
Cong, Zhimin
Tang, Boming
Cao, Xuejuan
Yu, Xinhua

Pagination:

17p

Publication Date:

2014

Conference:

Transportation Research Board 93rd Annual Meeting

Location: Washington DC
Date: 2014-1-12 to 2014-1-16
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References

Uncontrolled Terms:

Material properties

Subject Areas:

Environment; Highways; Pavements; I15: Environment

Source Data:

Transportation Research Board Annual Meeting 2014 Paper #14-2760

Files:

TRIS, TRB, ATRI

Created Date:

Jan 27 2014 2:56PM