Browse > Article
http://dx.doi.org/10.7780/kjrs.2022.38.6.1.31

A Numerical Study on the Effects of Urban Forest and Street Tree on Air Flow and Temperature  

Kang, Geon (Supercomputer Center, Pukyong National University)
Choi, Wonsik (Major of Environmental Atmospheric Sciences, Division of Earth and Environmental System Sciences, Pukyong National University)
Kim, Jae-Jin (Major of Environmental Atmospheric Sciences, Division of Earth and Environmental System Sciences, Pukyong National University)
Publication Information
Korean Journal of Remote Sensing / v.38, no.6_1, 2022 , pp. 1395-1406 More about this Journal
Abstract
This study investigated the effects of the urban forest and street trees on flow and temperature distribution in the Daegu National Debt Redemption Movement Memorial Park. For this, we implemented tree-drag and tree-cooling parameterization schemes in a computational fluid dynamics (CFD) model and validated the simulated wind speeds, wind directions, and air temperatures against the measured ones. We used the wind speeds, wind directions, air temperatures predicted by the local data assimilation and prediction system (LDAPS) as the inflow boundary conditions. To investigate the flow and thermal characteristics in the presence of trees in the target area, we conducted numerical experiments in the absence and presence of trees. In the absence of trees, strong winds and monotonous flows were formed inside the park, because there were no obstacles inducing friction. The temperature was inversely proportional to the wind speed. In the presence of trees, the wind speeds(temperatures) were reduced by more than 40 (5)% inside the park with a high planting density due to the tree drag (cooling) effect, and those also affected the wind speeds and temperatures outside the park. Even near the roadside, the wind speeds and temperatures were generally reduced by the trees, but the wind speeds and air temperatures increased partly due to the change in the flow pattern caused by tree drag.
Keywords
Urban forest and street trees; Computational fluid dynamics; Drag effects; Cooling effects; Flow and temperature changes;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Kang, G., J.-J. Kim, and W. Choi, 2020. Computational fluid dynamics simulation of tree effects on pedestrian wind comfort in an urban area, Sustainable Cities and Society, 56: 102086. https://doi.org/10.1016/j.scs.2020.102086   DOI
2 Patankar, S. V., 1980. Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York, NY, USA, p. 197.
3 Versteeg, H.K. and W. Malalasekera, 1995. An Introduction to Computational Fluid Dynamics: The Finite Volume Method, Longman Scientific & Technical, New York, NY, USA, p. 257.
4 Yakhot, V., S.A. Orszag, S. Thangam, T.B. Gatski, and C.G. Speziale, 1992. Development of turbulence models for shear flows by a double expansion technique, Physics of Fluids, 4(7): 1510-1520. https://doi.org/10.1063/1.858424   DOI
5 Vos, P.E., B. Maiheu, J. Vankerkom, and S. Janssen, 2013. Improving local air quality in cities: to tree or not to tree?, Environmental Pollution, 183: 113-122. https://doi.org/10.1016/j.envpol.2012.10.021   DOI
6 Gromke, C., B. Blocken, W. Janssen, B. Merema, T. van Hooff, and H. Timmermans, 2015. CFD analysis of transpirational cooling by vegetation: Case study for specific meteorological conditions during a heat wave in Arnhem, Netherlands, Building and Environment, 83: 11-26. https://doi.org/10.1016/j.buildenv.2014.04.022   DOI
7 Balczo, M., C. Gromke, and B. Ruck, 2009. Numerical modeling of flow and pollutant dispersion in street canyons with tree planting, Meteorologische Zeitschrift, 18(2): 197. https://doi.org/10.1127/0941-2948/2009/0361   DOI
8 Bruse, M. and H. Fleer, 1998. Simulating surface-plant-air interactions inside urban environments with a three dimensional numerical model, Environmental Modelling & Software, 13(3-4): 373-384. https://doi.org/10.1016/S1364-8152(98)00042-5   DOI
9 Buccolieri, R., J.L. Santiago, E. Rivas, and B. Sanchez, 2018. Review on urban tree modelling in CFD simulations: Aerodynamic, deposition and thermal effects, Urban Forestry & Urban Greening, 31: 212-220. https://doi.org/10.1016/j.ufug.2018.03.003   DOI
10 Castro, I.P. and D.D. Apsley, 1997. Flow and dispersion over topography: a comparison between numerical and laboratory data for two-dimensional flows, Atmospheric Environment, 31(6): 839-850. https://doi.org/10.1016/S1352-2310(96)00248-8   DOI
11 Toparlar, Y., B. Blocken, B. Maiheu, and G.J.F. Van Heijst, 2017. A review on the CFD analysis of urban microclimate, Renewable and Sustainable Energy Reviews, 80: 1613-1640. https://doi.org/10.1016/j.rser.2017.05.248   DOI