Spatiotemporal Footprints of Surface Urban Heat Islands in the Urban Agglomeration of Yangtze River Delta During 2000–2022

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(5), P. 892 - 892

Published: March 3, 2025

Compared with atmospheric urban heat islands, surface islands (SUHIs) are easily monitored by the thermal sensors on satellites and have a more stable spatial pattern resembling built-up lands across single cities, large metropolitans, agglomerations; hence, they gaining attention from scholars planners worldwide in search for reasonable patterns scales to guide future development. Traditional urban–rural dichotomies, being sensitive representative rural areas diurnal seasonal variations land temperature (LST), obtain inflated varying SUHI footprints of approximately 1.0–6.5 times size different satellite-retrieved LST datasets many cities metropolitan areas, which not conducive developing strategies mitigate SUHIs. Taking Yangtze River Delta agglomeration China as an example, we proposed improved structural similarity index quantify SUHIs multiple at annual interval. We identified gridded anomalies (LSTAs) related urbanization adopting random forest models climate, urbanization, geographical, biophysical, topographical parameters. Using LSTA cycle grid point relative reference terms average values, variances, shapes characterize SUHIs, cross-validated ~1.06–2.45 × 104 km2 smaller than clear transition zones between zone were obtained 2000–2022. Hence, can balance urbanization’s benefits adverse effects enhancing design. Considering that rapidly transformed into ratio extent increasing 0.43 0.62 during 2000–2022, should also take measures prevent rapid expansion high-density ISA density above 65%

Language: Английский

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Experimental and Numerical Investigation of Heat Transfer Characteristics of Double-Layer Phase Change Walls for Enhanced Thermal Regulation in Summer Climates

Buildings, Journal Year: 2025, Volume and Issue: 15(6), P. 962 - 962

Published: March 19, 2025

This study employs the effective heat capacity method within COMSOL simulation framework to analyze thermal performance of double-layer phase-change walls under typical summer climatic conditions in Zhengzhou, Henan Province. The model considers a wall structure with total thickness 100 mm and height 300 mm, where exterior surface represents outdoor environment, interior indoor top bottom boundaries are assumed be adiabatic. A highly refined triangular mesh ensures numerical stability solution accuracy. Special attention is given influence Micro-PCM content on storage characteristics. Simulation results demonstrate that increasing substantially enhances regulation walls. At volume fraction 15%, peak temperature reduced by 4.33 °C compared conventional wall, while attenuation factor increases 16.88. Furthermore, mean delay extends 440 min, amplitude decreases 1.13 °C, instantaneous flux 13.24 W/m2. These findings highlight significant latent superior modulation walls, offering valuable technical reference for design energy-efficient building envelope systems.

Language: Английский

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Greenspace coverage vs. enhanced vegetation index: Correlations with surface urban heat island intensity in different climate zones

Urban Climate, Journal Year: 2024, Volume and Issue: 58, P. 102140 - 102140

Published: Sept. 28, 2024

Language: Английский

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Evaluation of the toxicity of pervious concretes with WFS through germination tests with Eruca sativa (arugula) and Triticum aestivum (wheat) seeds

Matéria (Rio de Janeiro), Journal Year: 2025, Volume and Issue: 30

Published: Jan. 1, 2025

ABSTRACT Concrete is the most used construction material, which results in harmful impacts on environment due to consumption of natural resources. Hence need use alternative materials, e.g., waste from sector and even other production sectors. This context includes development concrete with sustainable functionality, such as pervious incorporation foundry sand (WFS), a generated by sector. However, there scientific gap focusing environmental viability concretes. In this sense, study aims evaluate toxicity pevious concretes WFS, through germination tests Eruca sativa (arugula) Triticum aestivum (wheat) seeds. The statistical analysis showed that was no significant effect WFS rate for both seeds used. Regarding root growth, it observed II (>% Portland cement) had lower impact arugula (more sensitive). Therefore, developed found be safe relation phytotoxicity.

Language: Английский

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Global patterns and determinants of year-to-year variations in surface urban heat islands

ISPRS Journal of Photogrammetry and Remote Sensing, Journal Year: 2025, Volume and Issue: 223, P. 399 - 412

Published: March 29, 2025

Language: Английский

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Seasonal Spatiotemporal Dynamics and Gradients of the Urban Heat Island Effect in Subtropical Furnace Megacity

Sustainability, Journal Year: 2025, Volume and Issue: 17(7), P. 3238 - 3238

Published: April 5, 2025

Urban heat island (UHI) effect significantly influences the urban sustainability and health of cities varies seasonally. However, spring autumn have received less attention. Furthermore, research on long-term seasonal UHI changes impacts is insufficient. This study examines spatiotemporal dynamics gradient characteristics in spring, summer, autumn, winter Changsha, a typical subtropical “furnace city” from 2006 to 2022. (1) Spatiotemporal dynamics: The high-temperature (relatively zone zone) range expands most least autumn. Additionally, migrates northward within area, proximity core results multiple effects. (2) Gradient characteristics: proportion decreases varying degrees 5 km central point, but increases 6–8 11–13 gradients, especially 8 aggregation index (AI), contagion (CONTAG), largest patch (LPI) decreased, with patches more affected by these metrics Overall, this offers new insights into effects development UHI, which are crucial for addressing climate change, promoting sustainability, improving human well-being.

Language: Английский

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Identification of surface urban heat versus cool islands for arid cities depends on the choice of urban and rural definitions

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 951, P. 175631 - 175631

Published: Aug. 19, 2024

Language: Английский

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Evaluating the effectiveness of innovative pervious concrete pavement system for mitigating urban heat island effects, de-icing, and de-clogging

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 449, P. 138361 - 138361

Published: Sept. 25, 2024

Language: Английский

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A new two-step estimation approach for retrieving surface urban heat island intensity and footprint based on urban-rural temperature gradients

International Journal of Geographical Information Science, Journal Year: 2024, Volume and Issue: 38(11), P. 2348 - 2378

Published: July 30, 2024

Past decades have seen substantial efforts devoted to observing, assessing, and documenting the urban heat island (UHI) phenomenon. However, discrepant criteria of non-urban references ambiguous distinctions between rural landscapes pose great challenges in measuring UHI magnitudes spatial extents. This study goes beyond conventional urban-rural dichotomy introduces a new two-step approach based on continuous transition thermal environments along gradients. The is applied quantify Surface (SUHI) intensities footprints across 283 Chinese cities from 2005 2018 using multiple satellite-derived data sources. results include: 1) avoids limitations subjective reference selections provides reliable quantification SUHI characteristics various over time. 2) extracted by our are more reasonable than those obtained two existing methods, with footprint ratios generally ranging within 0 − 6 times area. 3) concentrated estimates intensity. Typically, ignoring sources non-built-up areas can cause an overestimation effect misidentification remote high temperatures. Overall, enables accurate effect, thereby facilitating policy-making for mitigation.

Language: Английский

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An analysis of urban land subsidence susceptibility based on complex network

Natural Hazards, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 7, 2024

Language: Английский

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