How can urban green spaces be planned to mitigate urban heat island effect under different climatic backgrounds? A threshold-based perspective

Zhou, Wen; Yu, Wendong; Zhang, Ziyi; Wei, Cao; Wu, Tao

doi:10.1016/j.scitotenv.2023.164422

Cited by 41 publications

(8 citation statements)

References 65 publications

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“…This study has also shown that vegetated areas have the greatest impact on UCI intensity among different LULC types along river courses in spring, summer and autumn. The presence of riverside green spaces can effectively lower the LST of the river section, as urban green spaces have been demonstrated to be another urban “cold source” 47 – 49 . The coupling effect between coexisting water bodies and green spaces is still uncertain, and needs to be further investigated.…”

Section: Discussionmentioning

confidence: 99%

Exploring the spatial and seasonal heterogeneity of cooling effect of an urban river on a landscape scale

Zhou,

Wu,

Tao

2024

Sci Rep

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Urban water bodies can effectively mitigate the urban heat island effect and thus enhance the climate resilience of urban areas. The cooling effect of different water bodies varies, however, the cooling heterogeneity of different sections of a single watercourse or river network is rarely considered. Based on various satellite images, geospatial approaches and statistical analyses, our study confirmed the cooling heterogeneity from spatial and seasonal perspectives of the Suzhou Outer-city River in detail in the urban area of Suzhou, China. The cooling effect of the river was observed in the daytime in four seasons, and it is strongest in summer, followed by spring and autumn, and weakest in winter. The combination of the width of the river reach, the width and the NDVI value of the adjacent green space can explain a significant part of the cooling heterogeneity of the different river sections in different seasons. Land surface temperature (LST) variations along the river are more related to the width of the river reach, but the variations of the cooling distance are more related to the adjacent green space. The cooling effect of a river reach could be enhanced if it is accompanied by green spaces. In addition, the cooling effect of a looping river is stronger on the inside area than on the outside. The methodology and results of this study could help orient scientific landscape strategies in urban planning for cooler cities.

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Section: Discussionmentioning

confidence: 99%

Exploring the spatial and seasonal heterogeneity of cooling effect of an urban river on a landscape scale

Zhou,

Wu,

Tao

2024

Sci Rep

Self Cite

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“…Moreno et al (2023) showed that there are tree species that impact the UHI effect more significantly than others [83]. Some GIs reduce heat through efficient transpiration and shading [9,82], while others excel at capturing air pollutants [21]. This knowledge empowers city planners to optimize the composition of urban GIs to create more sustainable cities amid current climate uncertainties.…”

Section: Possible Contributions To Urban Vegetation Management and Ec...mentioning

confidence: 99%

“…Leveraging evapotranspiration, GIs dissipate heat, effectively reducing the UHI effect [6,8]. Strategic urban planning mandates meticulous consideration of GIs, encompassing factors like vegetation composition, density, and climate conditions, to combat urban heat effectively [9]. For instance, Marando et al (2022) ascertain that achieving a 1 • C temperature decrease in European cities requires a minimum tree cover of 16% [7].…”

Section: Introductionmentioning

confidence: 99%

Multi-Sensor Classification Framework of Urban Vegetation for Improving Ecological Services Management

Tiwari,

Kira,

Bamah

et al. 2024

Remote Sensing

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Recent climatic changes have profoundly impacted the urban microclimate, exposing city dwellers to harsh living conditions. One effective approach to mitigating these events involves incorporating more green infrastructure into the cityscape. The ecological services provided by urban vegetation play a crucial role in enhancing the sustainability and livability of cities. However, monitoring urban vegetation and accurately estimating its status pose challenges due to the heterogeneous nature of the urban environment. In response to this, the current study proposes utilizing a remote sensing-based classification framework to enhance data availability, thereby improving practices related to urban vegetation management. The aim of the current research is to explore the spatial pattern of vegetation and enhance the classification of tree species within diverse and complex urban environments. This study combines various remote sensing observations to enhance classification capabilities. High-resolution colored rectified aerial photographs, LiDAR-derived products, and hyperspectral data are merged and analyzed using advanced classifier methods, specifically partial least squares-discriminant analysis (PLS-DA) and object-based image analysis (OBIA). The OBIA method demonstrates an impressive overall accuracy of 95.30%, while the PLS-DA model excels with a remarkable overall accuracy of 100%. The findings validate the efficacy of incorporating OBIA, aerial photographs, LiDAR, and hyperspectral data in improving tree species classification and mapping within the context of PLS-DA. This classification framework holds significant potential for enhancing management practices and tools, thereby optimizing the ecological services provided by urban vegetation and fostering the development of sustainable cities.

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“…On the other hand, nature-based solutions (NBSs) such as tree planting, green permeable surfaces (e.g., grass) or water-based elements are receiving considerable attention [30,31]. Based on the green evapotranspiration principle that air is cooled by replacing sensible heat with latent heat [32], adding vegetation is quite a diffuse and effective mitigation strategy all over the world [33,34]. Additionally, water basin and water design elements are spreading as a way to improve outdoor microclimate in cities [35,36], even if the increasing scarcity of water due to CC might hamper the success of this strategy.…”

Section: How To Mitigate Urban Heat Stressmentioning

confidence: 99%

Outdoor Microclimate in Courtyard Buildings: Impact of Building Perimeter Configuration and Tree Density

Marchi,

Gaspari,

Fabbri

2023

Buildings

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As the effects of climate change and urbanisation intensify, liveability and comfort in outdoor spaces decrease. Because of large spaces exposed to solar radiation and low crossing of airflows, courtyard buildings are extremely vulnerable in this regard. However, there are significant gaps in the literature on outdoor comfort in courtyards, especially regarding the effect of border configuration (including gap position and features), as well that of tree density. The study proposes a methodology—to be used during preliminary design—to compare the effect of alternative scenarios for courtyard buildings on outdoor microclimate, varying both the building perimeter configuration and courtyard vegetation layout. A matrix is set to combine the two variables and select relevant scenarios, which are then simulated in ENVI-met focusing on air temperature, wind speed and physiological equivalent temperature (PET). A case study in Bologna, Italy (humid subtropical climate) is presented as an example of the implementation. The resulting outdoor microclimate maps and frequency diagrams are compared and discussed. It emerges that both variables have a role in outdoor comfort: while gap configuration affects air temperature more (up to a difference of 1 °C), tree density impacts PET by up to 2 °C difference. The methodology can be replicated in several other contexts to support the optimisation of courtyard building design from the early stages.

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How can urban green spaces be planned to mitigate urban heat island effect under different climatic backgrounds? A threshold-based perspective

Cited by 41 publications

References 65 publications

Exploring the spatial and seasonal heterogeneity of cooling effect of an urban river on a landscape scale

Exploring the spatial and seasonal heterogeneity of cooling effect of an urban river on a landscape scale

Multi-Sensor Classification Framework of Urban Vegetation for Improving Ecological Services Management

Outdoor Microclimate in Courtyard Buildings: Impact of Building Perimeter Configuration and Tree Density

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