scholarly journals A Study of Urban Heat Island in Chuncheon Using WRF Model and Field Measurements

2012 ◽  
Vol 28 (2) ◽  
pp. 119-130 ◽  
Author(s):  
Chong-Bum Lee ◽  
Jea-Chul Kim ◽  
Yun-Jung Jang
Keyword(s):  
Urban Heat Island ◽  
Wrf Model ◽  
Field Measurements ◽  
Heat Island ◽  
Urban Heat

scholarly journals A New Convective Velocity Scale for Studying Diurnal Urban Heat Island Circulation

2016 ◽  
Vol 55 (10) ◽  
pp. 2151-2164 ◽  
Author(s):  
Yifan Fan ◽  
Yuguo Li ◽  
Xiaoxue Wang ◽  
Franco Catalano
Keyword(s):  
Prandtl Number ◽  
Urban Heat Island ◽  
Field Measurements ◽  
Small Scale ◽  
Water Tank ◽  
Heat Island ◽  
Convective Velocity ◽  
Velocity Scale ◽  
Urban Heat ◽  
Urban Heat Island Circulation

AbstractUrban heat island circulation establishes an urban dome under stable stratification and no background wind conditions. Small-scale water models have been a very useful tool in the exploration of the mechanisms by which urban domes and their associated wind flows are formed. Data are available from a number of water-tank heat island models. Data from field measurements, computational fluid dynamics, and small-scale water-tank experiments are compared in this paper. The small-scale water-tank experiments were found to produce relatively low radial velocities, such as the radial horizontal velocity. Different relevant velocity scales developed in the literature were reviewed. The influence of the Prandtl number on convective flows was analyzed. The analysis resulted in a new convective velocity scale that is a function of the Prandtl number, and the new scale was found to work well. This new development is expected to render small-scale models more useful in urban wind studies. The new convective velocity scale may be extended to water-modeling studies of other buoyancy-driven airflows.

A Scaling Law for the Urban Heat Island Phenomenon: Deductions From Field Measurements and Comparisons With Existing Results From Laboratory Experiments

2014 ◽  
Author(s):  
Marina K.-A. Neophytou ◽  
Harindra J. S. Fernando ◽  
Ekaterina Batchvarova ◽  
Mats Sandberg ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Urban Heat Island ◽  
Laboratory Experiments ◽  
Scaling Law ◽  
Field Measurements ◽  
Capital City ◽  
Mitigation Measures ◽  
Heat Island ◽  
Multi Scale ◽  
Urban Heat ◽  
The Impact

We report results from a multi-scale field experiment conducted in Cyprus in July 2010 in order to investigate the Urban Heat Island (UHI) in Nicosia capital city and its interaction with multi-scale meteorological phenomena taking place in the broader region. Specifically, the results are analysed and interpreted in terms of a non-dimensional/scaling parameter dictating the urban heat island circulation reported from laboratory experiments (Fernando et al, 2010). We find that the field measurements obey the same scaling law during the day, in the absence of any other flow phenomena apart from the urban heating. During the night we find that the deduced non-dimensional value reduces to half (compared to that during the day); this is due to the presence of katabatic winds from Troodos mountains into the urban center of Nicosia and their cooling effect superimposed on diurnal urban heating. Based on this deduction, the impact of various proposed heat island mitigation measures in urban planning can be evaluated.

scholarly journals ANALYSIS OF URBAN HEAT ISLAND PHENOMENON IN OSAKA REGION USING WRF MODEL

2010 ◽  
Vol 75 (651) ◽  
pp. 465-471 ◽  
Author(s):  
Nanako KITAO ◽  
Masakazu MORIYAMA ◽  
Takahiro TANAKA ◽  
Hideki TAKEBAYASHI
Keyword(s):  
Urban Heat Island ◽  
Wrf Model ◽  
Heat Island ◽  
Urban Heat

Numerical study of the urban heat island over Athens (Greece) with the WRF model

2013 ◽  
Vol 73 ◽  
pp. 103-111 ◽  
Author(s):  
Theodore M. Giannaros ◽  
Dimitrios Melas ◽  
Ioannis A. Daglis ◽  
Iphigenia Keramitsoglou ◽  
Konstantinos Kourtidis
Keyword(s):  
Urban Heat Island ◽  
Numerical Study ◽  
Wrf Model ◽  
Heat Island ◽  
Urban Heat

scholarly journals The Impact of Albedo Increase to Mitigate the Urban Heat Island in Terni (Italy) Using the WRF Model

2016 ◽  
Vol 8 (10) ◽  
pp. 999 ◽  
Author(s):  
Elena Morini ◽  
Ali Touchaei ◽  
Beatrice Castellani ◽  
Federico Rossi ◽  
Franco Cotana
Keyword(s):  
Urban Heat Island ◽  
Wrf Model ◽  
Heat Island ◽  
Urban Heat ◽  
The Impact

Sensitivity of WRF Model to Urban Parameterizations, With Applications to Chicago Metropolitan Urban Heat Island

2014 ◽  
Author(s):  
Ashish Sharma ◽  
Harindra J. S. Fernando ◽  
Jessica Hellmann ◽  
Fei Chen
Keyword(s):  
Urban Heat Island ◽  
Metropolitan Area ◽  
Agricultural Land ◽  
Wrf Model ◽  
Anthropogenic Heat ◽  
Heat Island ◽  
Natural Habitats ◽  
Chicago Metropolitan Area ◽  
Urban Heat ◽  
Urban Parameterizations

Chicago is one of the most populated cites of US. It is located next to a freshwater source, Lake Michigan, and surrounded by productive agricultural land and diverse natural habitats. This study explores the sensitivity of mesoscale urban heat island (UHI) simulations to urban parameterizations, focusing on the Chicago metropolitan area (CMA) and its environs. For this purpose, a series of climate downscaling experiments using the Weather Research and Forecasting (WRF) model at 1 km horizontal resolution. A typical summer hot day in Chicago was considered, which is imitative of a summer day in the late 21st century. This study utilizes National Land Cover Database (NLCD) 2006 classifications to test UHI sensitivity for CMA. Among different urban parameterization schemes, BEP+BEM best reproduces the urban surface temperatures in comparison to other urban schemes. Results show that UHI is more pronounced with BEP and BEP+BEM schemes due to explicit accounting of anthropogenic heat (AH). The study also investigates the effects of urbanization on regional climate by replacing Chicago metropolitan area by agricultural landscape, which yielded increased surface wind speeds due to reduced mechanical and thermal resistance.

scholarly journals A Method for Selecting the Typical Days with Full Urban Heat Island Development in Hot and Humid Area, Case Study in Guangzhou, China

2020 ◽  
Vol 13 (1) ◽  
pp. 320
Author(s):  
Guang Chen ◽  
Minjie He ◽  
Nan Li ◽  
Hao He ◽  
Yunnan Cai ◽  
...  
Keyword(s):  
Urban Heat Island ◽  
Statistical Significance ◽  
Urban Ecosystems ◽  
Field Measurements ◽  
Meteorological Conditions ◽  
Daily Maximum ◽  
Heat Island ◽  
Simple Method ◽  
Local Climate ◽  
Urban Heat

The urban heat island (UHI) poses a significant threat to urban ecosystems, human health, and urban energy systems. Hence, days with a relatively higher UHI intensity should be selected for UHI observation and analysis. However, there is still a lack in the method and criteria for selecting the typical meteorological days for UHI survey and simulation. In this study, field measurements were conducted based on Local Climate Zone (LCZ) schemes over a one-year period to assess the UHI behavior in Guangzhou, China. The relationship between the diurnal temperature range (DTR) and UHI intensity was evaluated and analyzed quantitatively under different meteorological conditions classified by precipitation. The average daily maximum UHI intensity (UHIImax) during precipitation days was approximately 1.8 °C lower than that during non-precipitation days, confirming that precipitation has a negative effect on UHI development. The monthly DTR distribution was similar to the daily UHIImax distribution, which was higher in autumn and winter, but lower in spring and summer. DTR has a significant linear correlation with the daily UHIImax, with a Pearson’s correlation coefficient of >0.7 and statistical significance of <0.001. Based on a quantitative evaluation of our results, we determined that 10 °C could be regarded as the appropriate DTR threshold to identify the meteorological conditions conducive to UHI development; the meteorological conditions exhibited a high daily UHIImax in Guangzhou. This study provides a simple method to select typical meteorological days for UHI measurement and simulation, and a method to early-warning of intense UHI events based on weather forecasts.

Urban heat island mesoscale modelling study for the Budapest agglomeration area using the WRF model

Urban Climate ◽  
2017 ◽  
Vol 21 ◽  
pp. 66-86 ◽  
Author(s):  
Júlia Göndöcs ◽  
Hajnalka Breuer ◽  
Rita Pongrácz ◽  
Judit Bartholy
Keyword(s):  
Urban Heat Island ◽  
Wrf Model ◽  
Heat Island ◽  
Mesoscale Modelling ◽  
Urban Heat ◽  
Modelling Study
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