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Design for Outdoor Comfort: Microcli...

Tan, Zheng.

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Design for Outdoor Comfort: Microclimatic Effects of Urban Trees under Different Sky View Factors in Subtropical High-Density Cities.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Design for Outdoor Comfort: Microclimatic Effects of Urban Trees under Different Sky View Factors in Subtropical High-Density Cities./
作者:	Tan, Zheng.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	246 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
Contained By:	Dissertation Abstracts International78-05B(E).
標題:	Environmental studies. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10297336
ISBN:	9781369410419

Design for Outdoor Comfort: Microclimatic Effects of Urban Trees under Different Sky View Factors in Subtropical High-Density Cities.
Tan, Zheng.

Design for Outdoor Comfort: Microclimatic Effects of Urban Trees under Different Sky View Factors in Subtropical High-Density Cities. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 246 p.

Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.

Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2016.

This item is not available from ProQuest Dissertations & Theses.

Less systematic research has been done on climatic urban planning and design for hot climates, particularly hot-humid, as compared with other climate types. The hot summers in the subtropics cause thermal discomfort, which is intensified by the urban heat island effect in heavily built-up areas. Use of urban greenery has been proposed as a mechanism for microclimate regulation, yet the thermal impact of such greenery in subtropical high-density urban environments has seldom been mentioned in literature. In this study, the microclimatic effect of urban trees was investigated in the context of high-density cities in a subtropical climate. The prevailing summer weather condition in the hot-humid subtropics is cloudy, and is expected to become predominant due to climate change. It will be of regional significance to include cloudy conditions in the study of mitigation strategies to increase climate resilience in these areas.

ISBN: 9781369410419Subjects--Topical Terms:

2122803
Environmental studies.

Design for Outdoor Comfort: Microclimatic Effects of Urban Trees under Different Sky View Factors in Subtropical High-Density Cities.
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300 $a 246 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
500 $a Adviser: Jin Yeu Tsou.
502 $a Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2016.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Less systematic research has been done on climatic urban planning and design for hot climates, particularly hot-humid, as compared with other climate types. The hot summers in the subtropics cause thermal discomfort, which is intensified by the urban heat island effect in heavily built-up areas. Use of urban greenery has been proposed as a mechanism for microclimate regulation, yet the thermal impact of such greenery in subtropical high-density urban environments has seldom been mentioned in literature. In this study, the microclimatic effect of urban trees was investigated in the context of high-density cities in a subtropical climate. The prevailing summer weather condition in the hot-humid subtropics is cloudy, and is expected to become predominant due to climate change. It will be of regional significance to include cloudy conditions in the study of mitigation strategies to increase climate resilience in these areas.
520 $a To investigate the influence of building morphology on the net effects of urban trees, measurements were conducted in urban areas with sky view factor (SVF) ranging from 0.2 to 0.8. At each site, environmental variables were measured under tree canopies and at nearby exposed reference points, and mean radiant temperature was calculated using the measured data. The measurements show that the effects of urban trees are related to SVF, and that the impact of building morphology is more evident under cloudy conditions than in sunny conditions. In heavily built-up areas with low SVF of 0.2--0.3, trees provide a comfortable radiation environment by maintaining T mrt around 33°C in the early afternoon. Further parametric studies with simulations were conducted to study the cooling effects of trees under the block-array geometry with low and high SVF. The results indicate that crown density determines the microclimatic effects of trees. The cooling effects show larger spatial diversity in the low-SVF case than the in high-SVF case. In urban areas with 0.2 SVF, the physiological equivalent temperature was reduced to 29°C under dense to very dense tree canopies and cloudy conditions. Both measurement and simulation showed that with passive design of tree planting, a comfortable microclimate was provided in the heavily built urban environment of subtropical cities for nearly 70% of the summer. Based on these findings, a SVF-oriented planning method was proposed for the existing building geometry of two high-density districts, Mong Kok and Sham Shui Po, and tested with simulations. Optimized solar orientation for tree planting in subtropical areas should be determined, taking into account the early-afternoon sun angle.
520 $a The study discusses existing drawbacks in the GMPs of Hong Kong, providing design suggestions to refine relevant planning methods. When planning district greening projects in densely built urban areas, it is advisable to place trees in areas with low SVFs, to secure a comfortable microclimate in green spaces during summer periods. Moreover, it is advisable to consider both optimized orientation and areal wind paths when determining planting locations in districts with a prevailing summer wind direction.
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