Urban ventilation planning and its associated benefits based on numerical experiments: A case study in beijing, China

Zheng, Zihao; Ren, Guoyu; Gao, Huajian; Yang, Yibo

doi:10.1016/j.buildenv.2022.109383

Cited by 22 publications

(9 citation statements)

References 43 publications

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“…When the bifurcation airflow approached LCCs, the velocity of bifurcation airflow weakened to about 3.6 m/s. The rough urban landscape can act as a barrier to synoptic or mesoscale wind flow (Bornstein, 2011; Steiger & Orville, 2002; Zheng et al, 2022), so the moving direction of the bifurcation airflow was directly changed by LCCs, leading to the path of the detouring airflow being basically in agreement with observation (marked by a red arrow). In Figure 5c, LCCs in the city center were replaced by bare land in the sensitivity experiment.…”

Section: Resultssupporting

confidence: 66%

“…The Weather Research and Forecasting (WRF) model coupled with the urban canopy model (UCM) can be used to study the effects of urbanization on the evolution of thunderstorms (Thielen et al., 2000; Zheng et al, 2022). In this paper, the WRF4.0 version was coupled with a UCM to design a 5‐km, 1‐km double‐nested grid in the horizontal direction.…”

Section: Methodsmentioning

confidence: 99%

“…Beijing is the political, economic, and cultural center of China with a dense population. The built‐up area of Beijing is primarily concentrated in the southeast, covering over 1,500 km 2 in area, making it the most urbanized city in the Beijing–Tianjin–Hebei Urban Agglomeration (Zheng et al, 2022; Zong et al, 2022). Due to the combined influence of the urban environment and favorable meteorological conditions in the plain area, the down‐to‐hill thunderstorms moving from the mountainous area of Beijing sometimes develop into strong squall systems or thunderstorm clusters (Sun et al., 2013; Xiao et al., 2017; Zheng et al, 2020), causing persistent damage to the city (Qie et al., 2021; Wang et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

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Potential Urban Barrier Effect to Alter Patterns of Cloud‐To‐Ground Lightning in Beijing Metropolis

Tao

Yang

Zheng

et al. 2022

Geophysical Research Letters

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Cloud-to-ground (CG) lightning is a common phenomenon with thunderstorms and its potential to cause damage is partly dependent on the spatial distribution of thunderstorms (Stallins & Bentley, 2006;Wang et al., 2020). Therefore, the spatiotemporal patterns of CG lightning activity are critical for disaster prevention and mitigation. Urban modification of thunderstorm activity over cities is a subject with a long history and has been extensively investigated (Changnon, 2001;Naccarato et al., 2003;Steiger & Orville, 2002). When thunderstorms impact cities, two contrasting observations have been reported in the literature. Thunderstorms are mainly located over the city center (Craig & Bornstein, 2002), and the CG lightning activity is enhanced inside the urban area and downwind of it (Soriano & Pablo, 2002). However, some studies also showed that an urban barrier effect can lead thunderstorms to bifurcate and move around cities (

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Section: Resultssupporting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potential Urban Barrier Effect to Alter Patterns of Cloud‐To‐Ground Lightning in Beijing Metropolis

Tao

Yang

Zheng

et al. 2022

Geophysical Research Letters

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“…Using the temperature calculation of different types of LCZs can more accurately carry out the comparative study of CUHI at regional and global scales. A few scholars used LCZs to study urban excess warming and promoted the quantitative study of the synergies of HWs and CUHI from the perspective of urban morphologies (Ngarambe et al, 2020;Zheng et al, 2022;Xue et al, 2023;Yang et al, 2023). The CUHII under different LCZs was significantly different and was jointly determined by HWs, wind speed and the location of LCZs from the city center (Xue et al, 2023).…”

Section: The Influence Of Climate Background and Local Circulation On...mentioning

confidence: 99%

Research progress on the synergies between heat waves and canopy urban heat island and their driving factors

Shi,

Liu,

Wen

et al. 2024

Front. Environ. Sci.

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Under the background of global warming and accelerating urbanization, the interaction between heat waves (HWs) and canopy urban heat island (CUHI) has become one of the focuses in the field of global climate change research. This paper comprehensively reviewed and summarized the research process on the synergies of HWs and CUHI and their influencing mechanism. The coupling effect between HWs and CUHI remains debated, which may be related to the use of different standards to define heat wave events. The spatiotemporal differences in the synergies between HWs and CUHI was also influenced by climate background and local circulation. For instance, scholars have reached different conclusions regarding the stronger synergistic effect between daytime and nighttime in cities with different climate backgrounds. In addition, the modulation of urban morphological structure to the synergies between HWs and CUHI cannot be ignored. In the future, it is necessary to adopt different definitions of HWs to systematically study the formation mechanism of urban excess warming from different climatic backgrounds, local circulation conditions, and urban morphologies.

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“…The characteristics and patterns of CUHIs at both the urban and local scales could be valuable for improving human comfort and health and mitigating the risks of heat exposure to populations on extremely hot days (Li et al, 2023, Thanvisitthpon, 2022. The distribution of CUHIs is affected by local turbulence and the overall ventilation of the city, so it shows great disparities among different locations and exhibits trends of movement (Zheng et al, 2022, He, 2022. As LST data cannot be used to describe the canopy temperature (the air temperature above the surface) at a particular moment in time, relatively few studies have explored CUHI to date.…”

Section: Introductionmentioning

confidence: 99%

Identifying the Effect of Wind Condition on Canopy Urban Heat Island: A Case Study in Nanjing

Hao¹,

Tong²

2023

Proceedings of the 28th Conference on Computer Aided Architectural Design Research in Asia (CAADRIA) [Volume 2]

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The canopy urban heat island (CUHI) stands for the phenomenon where the air temperature in an urban area is significantly higher than in a suburban area. Identifying CUHIs and their pattern can improve the health and comfort of urban residents. However, previous studies have focused more on surface urban heat island (SUHI) yet lacking a proper quantification tool for canopy heat islands. This study integrates local climate zone (LCZ), urban form classification data, and anthropogenic heat to quantify the canopy temperature, so as to analyze the distribution of CUHIs as well as the relation with wind condition. The case study of Nanjing selects the weather data representing days with different wind directions, uses WRF to simulate local air temperatures and wind speeds and directions, and analyses the influence of wind on CUHI through comparison. The results show that: 1) in the case of Nanjing, wind direction within 50-90° increases CUHI and leads to a continuous rise in air temperature; 2) when the wind direction falls in some specific ranges, the overall CUHI area significantly shrinks. In short, this paper shows how wind condition affects CUHI, which contributes to predicting CUHI and reducing the risk of heat exposure to urban populations, and provides guidance for urban management and design.

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Urban ventilation planning and its associated benefits based on numerical experiments: A case study in beijing, China

Cited by 22 publications

References 43 publications

Potential Urban Barrier Effect to Alter Patterns of Cloud‐To‐Ground Lightning in Beijing Metropolis

Potential Urban Barrier Effect to Alter Patterns of Cloud‐To‐Ground Lightning in Beijing Metropolis

Research progress on the synergies between heat waves and canopy urban heat island and their driving factors

Identifying the Effect of Wind Condition on Canopy Urban Heat Island: A Case Study in Nanjing

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