Numerical Simulation of Local Climate Zone Cooling Achieved through Modification of Trees, Albedo and Green Roofs-A Case Study of Changsha, China

被引:42
作者
Chen, Yaping [1 ]
Zheng, Bohong [1 ]
Hu, Yinze [2 ]
机构
[1] Cent South Univ, Architecture & Art Sch, Changsha 410075, Peoples R China
[2] Hunan Univ, Business Sch, Changsha 410082, Peoples R China
关键词
local climate zones; ENVI-met; numerical simulation; thermal environment mitigation; URBAN HEAT-ISLAND; THERMAL COMFORT; AIR-TEMPERATURE; SHADE TREES; IMPACT; OUTDOOR; MICROCLIMATE; SURFACE; MITIGATION; ENVIRONMENT;
D O I
10.3390/su12072752
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
By exploring the cooling potential of tree quantity, ground albedo, green roofs and their combinations in local climate zone (LCZ)-4, LCZ-5, and LCZ-6, this study focuses on the optimum cooling level that can be achieved in open residential regions in Changsha. It designs and models 39 scenarios by integrating in situ measurement and ENVI-met numerical simulation and further compares cooling effects of various combinations of the cooling factors. The results show that (1) an increased number of trees and higher albedo are more effective compared to green roofs in reducing summer potential temperatures at street level (2 m high) in three LCZs. Negative correlations are observed in the pedestrian air temperature with trees and ground albedo; (2) the effects of cooling factors vary among different LCZ classes, with the increased 60% more trees leading to lower outdoor temperatures for LCZ-4 (0.28 degrees C), LCZ-5 (0.39 degrees C), and LCZ-6 (0.54 degrees C), while higher albedo of asphalt surface (increased by 0.4) is more effective in LCZ-4 (reaches to 0.68 degrees C) 14:00, compare to LCZ-5 (0.49 degrees C) and LCZ-6 (0.38 degrees C); (3) applying combined cooling methods can provoke air temperature reduction (up to 0.96 degrees C), especially when higher levels of tree quantities (increased by 60%) are coupled with cool ground materials (albedo increased by 0.4). The results can contribute useful information for improving thermal environment in existing residential regions and future residential planning.
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页数:23
相关论文
共 90 条
[1]   Evaluating the effect of trees on UHI mitigation and reduction of energy usage in different built up areas in Cairo [J].
Aboelata, Amir ;
Sodoudi, Sahar .
BUILDING AND ENVIRONMENT, 2020, 168
[2]   A comparison of thermal comfort conditions in four urban spaces by means of measurements and modelling techniques [J].
Acero, Juan A. ;
Herranz-Pascual, Karmele .
BUILDING AND ENVIRONMENT, 2015, 93 :245-257
[3]   Urban tree planting to maintain outdoor thermal comfort under climate change: The case of Vancouver's local climate zones [J].
Aminipouri, Mehdi ;
Rayner, David ;
Lindberg, Fredrik ;
Thorsson, Sofia ;
Knudby, Anders Jensen ;
Zickfeld, Kirsten ;
Middel, Ariane ;
Krayenhoff, E. Scott .
BUILDING AND ENVIRONMENT, 2019, 158 :226-236
[4]  
[Anonymous], 2010, IMPACT GREENING SYST
[5]  
[Anonymous], 2012, 22012 EEA
[6]  
[Anonymous], ENV RES LETT
[7]   The effect of tree shade and grass on surface and globe temperatures in an urban area [J].
Armson, D. ;
Stringer, P. ;
Ennos, A. R. .
URBAN FORESTRY & URBAN GREENING, 2012, 11 (03) :245-255
[8]   Thermal regulation capacity of a green roof system in the mediterranean region: The effects of vegetation and irrigation level [J].
Azenas, V. ;
Cuxart, J. ;
Picos, R. ;
Medrano, H. ;
Simo, G. ;
Lopez-Grifol, A. ;
Gulias, J. .
ENERGY AND BUILDINGS, 2018, 164 :226-238
[9]   Effect of pavement materials on surface temperatures in tropical environment [J].
Benrazavi, Rezvan Sadat ;
Dola, Kamariah Binti ;
Ujang, Norsidah ;
Benrazavi, Nour Sadat .
SUSTAINABLE CITIES AND SOCIETY, 2016, 22 :94-103
[10]   The outdoor microclimate benefits and energy saving resulting from green roofs retrofits [J].
Berardi, Umberto .
ENERGY AND BUILDINGS, 2016, 121 :217-229