Mesoscale Simulation of Year-to-Year Variation of Wind Power Potential over Southern China

Yim, Steve Hung Lam; Fung, Jimmy Chi Hung; Lau, Alexis K.H.

doi:10.3390/en20200340

Cited by 20 publications

(4 citation statements)

References 27 publications

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“…To set the input wind velocity profile particularly for the Mong Kok area by means of the log law, the site-specific annual wind data (U met ¼ 11 m/s) at a 450 m height (d met ) were obtained from the fifth-generation NCAR/PSU meso-scale model (MM5) [43] and, given the high urban density of Hong Kong, the surface roughness factor (a) was set at 0.35. NO 2 was selected as the emission gas as its concentration is still increasing in the metropolitan areas in Hong Kong.…”

Section: Modeling Settings In the Parametric Studymentioning

confidence: 99%

Improving air quality in high-density cities by understanding the relationship between air pollutant dispersion and urban morphologies

Yuan

Norford

2014

Building and Environment

254

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a b s t r a c tIn high-density megacities, air pollution has a higher impact on public health than cities of lower population density. Apart from higher pollution emissions due to human activities in densely populated street canyons, stagnated air flow due to closely packed tall buildings means lower dispersion potential. The coupled result leads to frequent reports of high air pollution indexes at street-side stations in Hong Kong. High-density urban morphologies need to be carefully designed to lessen the ill effects of high density urban living. This study addresses the knowledge-gap between planning and design principles and air pollution dispersion potentials in high density cities. The air ventilation assessment for projects in high-density Hong Kong is advanced to include air pollutant dispersion issues. The methods in this study are CFD simulation and parametric study. The SST keu model is adopted after balancing the accuracy and computational cost in the comparative study. Urban-scale parametric studies are conducted to clarify the effects of urban permeability and building geometries on air pollution dispersion, for both the outdoor pedestrian environment and the indoor environment in the roadside buildings. Given the finite land resources in high-density cities and the numerous planning and design restrictions for development projects, the effectiveness of mitigation strategies is evaluated to optimize the benefits. A real urban case study is finally conducted to demonstrate that the suggested design principles from the parametric study are feasible in the practical high density urban design.

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Section: Modeling Settings In the Parametric Studymentioning

confidence: 99%

Improving air quality in high-density cities by understanding the relationship between air pollutant dispersion and urban morphologies

Yuan

Norford

2014

Building and Environment

254

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“…To set the inlet boundary condition, especially for the Mong Kok area, by Equation (4), the site-specific annual wind rose data at a 450 m height are obtained from the fifth-generation NCAR/PSU meso-scale model (MM5) [40]. As shown in Fig.…”

Section: Computational Modelingmentioning

confidence: 99%

Building porosity for better urban ventilation in high-density cities – A computational parametric study

Yuan

2012

Building and Environment

216

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a b s t r a c tShape-edged buildings impose large frictional drag on the flow in the urban boundary layer. In the subtropics, especially during hot and humid summers, compact building blocks create stagnant air that worsens outdoor urban thermal comfort. The current study adapts the keu SST turbulence model to simulate air flow in urban areas. The accuracy of the keu SST turbulence model in detecting air flow around a rectangular block is validated by comparing it with the data from the wind tunnel experiment. In the computational parametric study, wind speed classification is derived based on Physiological Equivalent Temperature (PET) to evaluate the effect of wind speed on outdoor thermal comfort. Numerical analysis compares the effects of different building morphology modifications on pedestrianlevel natural ventilation. Critical design issues are also identified. From both the accuracy and practical points of view, the current study allows city planners and architects to improve building porosity efficiently for better pedestrian-level urban ventilation, without losing land use efficacy.

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“…Sailor et al (2008) also note that GCMs do not well represent observed surface wind speeds. Mesoscale models are commonly used to project the detailed climate of a region, with high-resolution grid spacing that meets local climate information needs (Oh et al, 2004;Yim et al, 2009;Hong et al, 2010;Chotamonsak et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Projected changes in wind speed over the Republic of Korea under A1B climate change scenario

Kim

2013

Intl Journal of Climatology

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In this study, an attempt was made to investigate a future wind‐speed change over the Republic of Korea using a mesoscale weather research and forecasting (WRF) model. We presented dynamically downscaled wind fields and the physical processes that derived the surface wind changes. A double‐nested WRF model within the global‐scale scenario from the fifth generation of the ECHAM general‐circulation model (ECHAM5) was integrated for the present‐day (the late 20th century, 1990–1999) and future (the mid‐21st century, 2045–2054) wind climate. The ensemble mean of the simulated results for the sensitivity of planetary boundary‐layer physics provided a relative advantage in determining synoptic and surface fields. A reasonable and realistic wind climatology, influenced by the asymmetric heating of land and sea, was identified over the East Asian monsoon region. The observed spatial and temporal distributions of temperature and wind speed were also reproduced well by the mesoscale simulations. Projected wind‐speed changes at 80 m above ground level varied from –9.53 to 29.80% depending on the location and season. [Correction added 3 March 2014 after original online publication: in the preceding sentence ‘9.53’ has been corrected to ‘–9.53’.] The strong wind speed in the cold season decreased (–5.45%), whereas the weak wind speed in the warm season increased (4.54%). A possible cause of the weakened and strengthened winds in cold and warm seasons, respectively, is shown to be the effects in the lower‐tropospheric pressure‐gradient force accompanied by pronounced warming.

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Mesoscale Simulation of Year-to-Year Variation of Wind Power Potential over Southern China

Cited by 20 publications

References 27 publications

Improving air quality in high-density cities by understanding the relationship between air pollutant dispersion and urban morphologies

Improving air quality in high-density cities by understanding the relationship between air pollutant dispersion and urban morphologies

Building porosity for better urban ventilation in high-density cities – A computational parametric study

Projected changes in wind speed over the Republic of Korea under A1B climate change scenario

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