---
OA_type: closed access
_id: '22561'
abstract:
- lang: eng
  text: "Urban tree planting is an effective strategy to reduce temperature locally
    and eventually mitigate Urban Heat\r\nIsland. Although its cooling effects have
    been widely reported, understanding of coupling effects of street\r\nmorphologies
    and tree characteristics on thermal environment is insufficient, especially in
    high-density cities. A\r\nparametric study is conducted to investigate effects
    of leaf area index (LAI = 1.0,2.0,3.0,4.0,5.0,6.0) and tree\r\ncrown radius (rtree
    = 2.0,3.4,4.4,5.0 m) on thermal environment inside streets with various aspect
    ratios (street\r\nheight/width, H/W = 1.0–5.0). A mechanistic urban canopy model
    Urban Tethys-Chloris (UT&C) is selected and\r\nintegrated with a new semi-empirical
    wind parameterization based on drag coefficients and frontal area densities\r\nof
    buildings and trees. Modified UT&C is validated by a unique and controllable scaled
    outdoor experiment. The\r\nresearch outputs can be summarized as follows: (1)
    Calculated air temperature (Ta), wind speed (V), and thermal\r\ncomfort indices
    (Mean Radiant Temperature (Tmrt) and Universal Thermal Climate Index (UTCI)) are
    in good\r\nagreement with results from scaled outdoor experiments, while slight
    overestimation of relative humidity (RH)\r\noccurs in tree cases; (2) Increasing
    LAI and rtree both bring stronger cooling effects by up to 20.2 ◦C (Tmrt) and\r\n4.0
    ◦C (UTCI); (3) Narrower streets weaken trees’ cooling effects and increasing LAI
    and rtree could be less\r\nefficient for higher H/W than lower H/W; (4) LAI =
    4.0 and rtree = 5.0 m are optimal for wide streets (H/W =\r\n1.0–3.0) to provide
    maximum UTCI cooling (about 4.0 ◦C), while LAI = 4.0 and rtree = 3.4 m are suggested
    for\r\nnarrow streets (H/W = 3.0–5.0). Our study provides useful information on
    evidence-based urban tree selection\r\nstrategies for urban planning and design. "
article_number: '111006'
article_processing_charge: No
article_type: original
author:
- first_name: Taihan
  full_name: Chen, Taihan
  last_name: Chen
- first_name: Naika
  full_name: Meili, Naika
  last_name: Meili
- first_name: Simone
  full_name: Fatichi, Simone
  id: cf8e546b-a9b0-11f0-a43b-aa89ed1b56d6
  last_name: Fatichi
- first_name: Jian
  full_name: Hang, Jian
  last_name: Hang
- first_name: Puay Yok
  full_name: Tan, Puay Yok
  last_name: Tan
- first_name: Chao
  full_name: Yuan, Chao
  last_name: Yuan
citation:
  ama: Chen T, Meili N, Fatichi S, Hang J, Tan PY, Yuan C. Effects of tree plantings
    with varying street aspect ratios on the thermal environment using a mechanistic
    urban canopy model. <i>Building and Environment</i>. 2023;246. doi:<a href="https://doi.org/10.1016/j.buildenv.2023.111006">10.1016/j.buildenv.2023.111006</a>
  apa: Chen, T., Meili, N., Fatichi, S., Hang, J., Tan, P. Y., &#38; Yuan, C. (2023).
    Effects of tree plantings with varying street aspect ratios on the thermal environment
    using a mechanistic urban canopy model. <i>Building and Environment</i>. Elsevier.
    <a href="https://doi.org/10.1016/j.buildenv.2023.111006">https://doi.org/10.1016/j.buildenv.2023.111006</a>
  chicago: Chen, Taihan, Naika Meili, Simone Fatichi, Jian Hang, Puay Yok Tan, and
    Chao Yuan. “Effects of Tree Plantings with Varying Street Aspect Ratios on the
    Thermal Environment Using a Mechanistic Urban Canopy Model.” <i>Building and Environment</i>.
    Elsevier, 2023. <a href="https://doi.org/10.1016/j.buildenv.2023.111006">https://doi.org/10.1016/j.buildenv.2023.111006</a>.
  ieee: T. Chen, N. Meili, S. Fatichi, J. Hang, P. Y. Tan, and C. Yuan, “Effects of
    tree plantings with varying street aspect ratios on the thermal environment using
    a mechanistic urban canopy model,” <i>Building and Environment</i>, vol. 246.
    Elsevier, 2023.
  ista: Chen T, Meili N, Fatichi S, Hang J, Tan PY, Yuan C. 2023. Effects of tree
    plantings with varying street aspect ratios on the thermal environment using a
    mechanistic urban canopy model. Building and Environment. 246, 111006.
  mla: Chen, Taihan, et al. “Effects of Tree Plantings with Varying Street Aspect
    Ratios on the Thermal Environment Using a Mechanistic Urban Canopy Model.” <i>Building
    and Environment</i>, vol. 246, 111006, Elsevier, 2023, doi:<a href="https://doi.org/10.1016/j.buildenv.2023.111006">10.1016/j.buildenv.2023.111006</a>.
  short: T. Chen, N. Meili, S. Fatichi, J. Hang, P.Y. Tan, C. Yuan, Building and Environment
    246 (2023).
das_tickbox: '1'
date_created: 2026-07-27T12:30:24Z
date_published: 2023-12-01T00:00:00Z
date_updated: 2026-08-12T08:37:07Z
day: '01'
doi: 10.1016/j.buildenv.2023.111006
extern: '1'
fulldoi: https://doi.org/10.1016/j.buildenv.2023.111006
intvolume: '       246'
keyword:
- Urban canopy model
- Scaled outdoor experiment
- Street aspect ratio
- Urban vegetation
- Pedestrian thermal comfort
language:
- iso: eng
month: '12'
oa_version: None
publication: Building and Environment
publication_identifier:
  eissn:
  - 1873-684X
  issn:
  - 0360-1323
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: Effects of tree plantings with varying street aspect ratios on the thermal
  environment using a mechanistic urban canopy model
type: journal_article
user_id: ba8df636-2132-11f1-aed0-ed93e2281fdd
volume: 246
year: '2023'
...