A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, China
Along with global climate change and urbanisation, the thermal environment is increasingly worse in summer, especially (sub)tropical regions. In recent decades, approaches improving the thermal environment have been frequently investigated. Factors of urban design, planning, and landscaping have bee...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Nature-Based Solutions |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772411523000356 |
| _version_ | 1797405336767823872 |
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| author | Yisha Liu Ting Liu Lin Jiang Manjiang Shi Xinyu Tan Xumei He Jierui Guo Xiaowei Shang |
| author_facet | Yisha Liu Ting Liu Lin Jiang Manjiang Shi Xinyu Tan Xumei He Jierui Guo Xiaowei Shang |
| author_sort | Yisha Liu |
| collection | DOAJ |
| description | Along with global climate change and urbanisation, the thermal environment is increasingly worse in summer, especially (sub)tropical regions. In recent decades, approaches improving the thermal environment have been frequently investigated. Factors of urban design, planning, and landscaping have been found thermal relevant. These factors were indicated by sky view factor (SVF), vegetation cover, leaf area index (LAI) etc. However, most studies focused one single factor, thermal performance difference between various factors were rarely explored. This study compared park canopy closure (PCC) and LAI about their effects on park thermal comfort indicated by various indices (air temperature, Ta; mean radiant temperature, MRT; and physiological equivalent temperature, PET). The PCC was different from LAI by leaf layer quantity (overlapping). Through a field measurement conducting in 8 parks around Mianyang (a subtropical riverside city, China; summer of 2018). The results revealed, both PCC and LAI were significantly thermal effective, LAI showed less significant thermal effects than PCC in linear models. That is to say, leaf layers had little effect linearly. The effects of PCC on the various indices varied for daily periods, with a significant effect on MRT during the day, Ta in the evening, and PET throughout the day. Increasing PCC from 0 to 1 could reduce PET by 29.44 °C (afternoon, R2 = 0.4928). Findings of this study confirmed the different environmental factors’ impacts on microclimates and distinguished the characteristics of various thermal indices. |
| first_indexed | 2024-03-09T03:08:27Z |
| format | Article |
| id | doaj.art-dac26f94d4204609bfc4e7b6c329e63b |
| institution | Directory Open Access Journal |
| issn | 2772-4115 |
| language | English |
| last_indexed | 2024-03-09T03:08:27Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nature-Based Solutions |
| spelling | doaj.art-dac26f94d4204609bfc4e7b6c329e63b2023-12-04T05:25:03ZengElsevierNature-Based Solutions2772-41152023-12-014100083A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, ChinaYisha Liu0Ting Liu1Lin Jiang2Manjiang Shi3Xinyu Tan4Xumei He5Jierui Guo6Xiaowei Shang7School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaSchool of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaCorresponding author.; School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaSchool of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaSchool of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaSchool of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaSchool of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaSchool of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, ChinaAlong with global climate change and urbanisation, the thermal environment is increasingly worse in summer, especially (sub)tropical regions. In recent decades, approaches improving the thermal environment have been frequently investigated. Factors of urban design, planning, and landscaping have been found thermal relevant. These factors were indicated by sky view factor (SVF), vegetation cover, leaf area index (LAI) etc. However, most studies focused one single factor, thermal performance difference between various factors were rarely explored. This study compared park canopy closure (PCC) and LAI about their effects on park thermal comfort indicated by various indices (air temperature, Ta; mean radiant temperature, MRT; and physiological equivalent temperature, PET). The PCC was different from LAI by leaf layer quantity (overlapping). Through a field measurement conducting in 8 parks around Mianyang (a subtropical riverside city, China; summer of 2018). The results revealed, both PCC and LAI were significantly thermal effective, LAI showed less significant thermal effects than PCC in linear models. That is to say, leaf layers had little effect linearly. The effects of PCC on the various indices varied for daily periods, with a significant effect on MRT during the day, Ta in the evening, and PET throughout the day. Increasing PCC from 0 to 1 could reduce PET by 29.44 °C (afternoon, R2 = 0.4928). Findings of this study confirmed the different environmental factors’ impacts on microclimates and distinguished the characteristics of various thermal indices.http://www.sciencedirect.com/science/article/pii/S2772411523000356Outdoor thermal comfortUrban parksPark canopy closureLeaf area indexPhysiological equivalent temperatureMean radiant temperature |
| spellingShingle | Yisha Liu Ting Liu Lin Jiang Manjiang Shi Xinyu Tan Xumei He Jierui Guo Xiaowei Shang A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, China Nature-Based Solutions Outdoor thermal comfort Urban parks Park canopy closure Leaf area index Physiological equivalent temperature Mean radiant temperature |
| title | A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, China |
| title_full | A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, China |
| title_fullStr | A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, China |
| title_full_unstemmed | A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, China |
| title_short | A comparative study of the influences of park physical factors on summer outdoor thermal environment, a pilot study of Mianyang, China |
| title_sort | comparative study of the influences of park physical factors on summer outdoor thermal environment a pilot study of mianyang china |
| topic | Outdoor thermal comfort Urban parks Park canopy closure Leaf area index Physiological equivalent temperature Mean radiant temperature |
| url | http://www.sciencedirect.com/science/article/pii/S2772411523000356 |
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