東華大學圖書館 |

Investigate the Thermal-Radiant Performance of Urban Green Infrastructure at the Pedestrian Level : = An Experience in Hong Kong.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigate the Thermal-Radiant Performance of Urban Green Infrastructure at the Pedestrian Level :/
其他題名:	An Experience in Hong Kong.
作者:	Ouyang, Wanlu.
面頁冊數:	1 online resource (231 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
標題:	Thermodynamics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29282521click for full text (PQDT)
ISBN:	9798802755938

Investigate the Thermal-Radiant Performance of Urban Green Infrastructure at the Pedestrian Level : = An Experience in Hong Kong.
Ouyang, Wanlu.

Investigate the Thermal-Radiant Performance of Urban Green Infrastructure at the Pedestrian Level :An Experience in Hong Kong. - 1 online resource (231 pages)

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2022.

Includes bibliographical references

Global climate change is irreversible, and extreme heat events (EHEs) will become more intense and frequent. However, the urbanization processes are still ongoing to change the land surface characteristics, which leads to a well-known phenomenon - urban heat island (UHI). UHI combined with EHEs would bring many problems to our cities, including threatening the health of the citizens. Currently, most of the rapidly developing countries and areas are located in tropical and subtropical regions. For those areas paying little attention to climate-sensitive planning and design, citizens will be vulnerable to urban heat threats.Green infrastructure (GI) has been identified as one of the most effective strategies for urban heat mitigation. Three typical GI typologies, classified based on the implementation location - namely green roof, green wall, and ground tree, are selected for the investigation in this study. When examining the cooling effects of GI, there are mainly three research gaps in current literature: 1) for empirical study based on field measurement, previous studies usually focused on single GI typology. Limited evidence compared the thermal-radiant performance of the three GI typologies within one site; 2) for a widely used microclimate simulation model - ENVI-met, current studies mostly validated it performance for single GI typology. It is pending to examine the performance of the model when estimating the three GI typologies simultaneously; 3) for parametric study in ENVI-met, current studies mainly quantify the ii cooling effects of single GI typology, or directly compare the differences between single or combined GI strategies. It is lacking a systematic quantification of cooling effects for different GI strategies.Therefore, this study aims to investigate the thermal-radiant performance of three GI typologies at the pedestrian level. Hong Kong, as a typical subtropical climate city, is selected as the study area. Four research objectives are to be achieved: 1) measure and compare the thermal-radiant performance of three GI typologies within one site; 2) validate the reliability of ENVI-met model for simulating the three GI typologies simultaneously; 3) systematically examine the cooling effect of seven GI strategies (based on three GI typologies) from a spatial-temporal perspective; 4) discuss both the research and practical implications for microclimate studies and outdoor thermal comfort promotion.The results can be summarized into three aspects: 1) the thermal-radiant performance of three GI typologies are significantly different, and the temporal periods and shading from surrounding buildings affect their performance; 2) the recent version of ENVI-met model is qualified for estimating the cooling performance of three GI typologies simultaneously; 3) the cooling effects of seven GI strategies are dissimilar for different cooling indicators, microclimate variables, and morphological conditions. This study can provide implications for further research and practice. It enhances our understanding of the cooling effects of three GI typologies, and provides some inspirations for future studies including measurement method selection, ENVI-met model settings, and spatial-temporal analysis approach. Besides, some strategies are suggested for sustainable planning and design, i.e., how to select GI strategies based on the morphological conditions, which can supplement to current greening policy and guidelines.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798802755938Subjects--Topical Terms:

517304
Thermodynamics.
Subjects--Index Terms:

Thermal-radiant performanceIndex Terms--Genre/Form:

542853
Electronic books.

Investigate the Thermal-Radiant Performance of Urban Green Infrastructure at the Pedestrian Level : = An Experience in Hong Kong.
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500 $a Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
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502 $a Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2022.
504 $a Includes bibliographical references
520 $a Global climate change is irreversible, and extreme heat events (EHEs) will become more intense and frequent. However, the urbanization processes are still ongoing to change the land surface characteristics, which leads to a well-known phenomenon - urban heat island (UHI). UHI combined with EHEs would bring many problems to our cities, including threatening the health of the citizens. Currently, most of the rapidly developing countries and areas are located in tropical and subtropical regions. For those areas paying little attention to climate-sensitive planning and design, citizens will be vulnerable to urban heat threats.Green infrastructure (GI) has been identified as one of the most effective strategies for urban heat mitigation. Three typical GI typologies, classified based on the implementation location - namely green roof, green wall, and ground tree, are selected for the investigation in this study. When examining the cooling effects of GI, there are mainly three research gaps in current literature: 1) for empirical study based on field measurement, previous studies usually focused on single GI typology. Limited evidence compared the thermal-radiant performance of the three GI typologies within one site; 2) for a widely used microclimate simulation model - ENVI-met, current studies mostly validated it performance for single GI typology. It is pending to examine the performance of the model when estimating the three GI typologies simultaneously; 3) for parametric study in ENVI-met, current studies mainly quantify the ii cooling effects of single GI typology, or directly compare the differences between single or combined GI strategies. It is lacking a systematic quantification of cooling effects for different GI strategies.Therefore, this study aims to investigate the thermal-radiant performance of three GI typologies at the pedestrian level. Hong Kong, as a typical subtropical climate city, is selected as the study area. Four research objectives are to be achieved: 1) measure and compare the thermal-radiant performance of three GI typologies within one site; 2) validate the reliability of ENVI-met model for simulating the three GI typologies simultaneously; 3) systematically examine the cooling effect of seven GI strategies (based on three GI typologies) from a spatial-temporal perspective; 4) discuss both the research and practical implications for microclimate studies and outdoor thermal comfort promotion.The results can be summarized into three aspects: 1) the thermal-radiant performance of three GI typologies are significantly different, and the temporal periods and shading from surrounding buildings affect their performance; 2) the recent version of ENVI-met model is qualified for estimating the cooling performance of three GI typologies simultaneously; 3) the cooling effects of seven GI strategies are dissimilar for different cooling indicators, microclimate variables, and morphological conditions. This study can provide implications for further research and practice. It enhances our understanding of the cooling effects of three GI typologies, and provides some inspirations for future studies including measurement method selection, ENVI-met model settings, and spatial-temporal analysis approach. Besides, some strategies are suggested for sustainable planning and design, i.e., how to select GI strategies based on the morphological conditions, which can supplement to current greening policy and guidelines.
520 $a 全球氣候變化趨勢已不可逆轉，極端高溫事件（EHEs）將變得更為激烈頻繁。然而，城市化進程仍在持續改變地表特徵，這導致了城市熱島（UHI）現象。UHI 和 EHEs 的結合將給城市帶來諸多問題，並威脅市民健康。目前，多數快速發展的國家和地區都集中於熱帶和亞熱帶地區。若缺少氣候敏感性規劃設計，市民將受到城市高溫的威脅。綠化基礎設施（GI）被認為緩解城市熱的有效策略之一。根據施行位置，有三種典型 GI：綠化屋頂、綠化牆體、地面樹木。研究 GI 降溫效應時，當前主要存在三個研究空缺：1）現場測量的實證研究多集中於單一 GI 類型。同一場地中，較少展現三種不同 GI 類型的熱量和輻射表現；2）廣泛使用的微氣候模型 - ENVI-met，多集中於驗證在單一 GI 類型的表現。ENVI-met 能否同時模擬三種 GI 類型的微氣候特點，有待進一步研究；3）ENVI-met 的參數化研究多量化單一 GI 類型的降溫效果，或直接對比單一與組合 GI 策略的差異。系統性量化不同 GI 策略的降溫效果仍十分缺乏。本文旨在探究三種 GI 類型於行人層面的熱量及輻射表現。香港，典型亞熱帶氣候城市，作為主要研究區域。主要有四個研究目標：1）測量並對比同一場地內的三種 GI 類型的熱量及輻射表現；2）驗證 ENVI-met 同時模擬三種 GI 類型的可靠性；3）基於 iv 時空分析，系統性評估七種 GI 策略的降溫效果；4）基於數據，討論本研究對微氣候和室外熱舒適度提升的研究和實際意義。研究結果可概括為三個方面：1）三種 GI 類型的熱量及輻射表現顯著不同，時間週期和建築物的遮蔭對他們的表現有影響；2）最近更新的 ENVI-met 模型被證實能同時模擬三種 GI 類型的降溫性能；3）七種綠化策略的降溫效果根據不同指標、微氣候變量和城市形態有所不同。本研究為進一步的微氣候研究和實踐提供啟示。它增加了對三種 GI 類型降溫效果的理解，為未來研究提供了方法的啟示，如測量方法選擇，ENVImet 模型設置，時空分析方法等。此外，本研究為可持續規劃設計提供了一些建議，即如何根據城市形態挑選 GI 策略，這對現有綠化政策和指導方針進行了相應補充。
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653 $a Green Infrastructure
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653 $a Pedestrian experience
653 $a Microclimate
653 $a Cooling effects
653 $a Outdoor thermal comfort
653 $a Numerical simulation
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