Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Spatiotemporal Heterogeneity of Green Land and Its Effect on the Thermal Comfort of Urban Human Settlements in the Central Coast of China, a Case in Rizhao Region

Version 1 : Received: 17 April 2023 / Approved: 17 April 2023 / Online: 17 April 2023 (07:47:16 CEST)

How to cite: Pan, T.; He, S.; Liu, Z.; Jiang, L.; Zhao, Q.; Hamdi, R. Spatiotemporal Heterogeneity of Green Land and Its Effect on the Thermal Comfort of Urban Human Settlements in the Central Coast of China, a Case in Rizhao Region. Preprints 2023, 2023040424. https://doi.org/10.20944/preprints202304.0424.v1 Pan, T.; He, S.; Liu, Z.; Jiang, L.; Zhao, Q.; Hamdi, R. Spatiotemporal Heterogeneity of Green Land and Its Effect on the Thermal Comfort of Urban Human Settlements in the Central Coast of China, a Case in Rizhao Region. Preprints 2023, 2023040424. https://doi.org/10.20944/preprints202304.0424.v1

Abstract

The central coast is one of the importantly livable regions in China, and green land plays a meaningful role in improving human settlements through regulating ecosystem services. However, the research on spatiotemporal heterogeneity of green land in different urbanized areas are still lacking in this region, which limits the timeliness of reporting on the land-surface thermal properties of residential environment from green land perspective. To address this issue, the synergistic methodology of “artificial numerical technology -- urban interior mixed pixel classification -- surface radiation energy balance model” was applied to investigate the green land change and its impact on human settlements in Rizhao region, which is known for its coastal ecology and greenery in China and obtained the United Nations habitat award. Main conclusions of this study are below: (1) Although total green land decreased by 474.05 km2, resulting in a decrease of 9.17% in its share of the entire study area from 2000-2022 during the urbanization process, but the greening levels improved within the built-up area, with the greening proportion of 25.34% in 2000 and 42.98 km2 in 2022. (2) Differences in green land at different urbanized regions were first observed, namely, urban greening rate was 37.78% in the old urban areas of 2022, while it was up to 46.43% in new urban areas. More attention was paid to the construction of urban green space during urban expansion, which will inevitably bring better visual and comfort experience to residents. (3) Thermal comfort indicators for urban residents were evaluated in latent heat flux (0-457.83 W/m2), sensible heat flux (0-645.09 W/m2), total available energy (254.07-659.42 W/m2) and others. (4) The lowered cooling temperature effect in the middle, high green land density region was 1.05 ℃ and 2.12 ℃ compared to the low-density region, and the average air temperature was 25.86 ℃. Also, spatial patterns of hot and cold uncomfortable areas were displayed in this study. Overall, this study provides the meaningfully practical reference for exploring the spatiotemporal heterogeneity of green land and its impact on residents' environments from the perspective of land-surface thermal properties in coastal areas of China and around the world.

Keywords

Land use; greening; land-surface thermal properties; residential environments; central coast region of China

Subject

Environmental and Earth Sciences, Remote Sensing

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