scholarly journals Spatial Process of Surface Urban Heat Island in Rapidly Growing Seoul Metropolitan Area for Sustainable Urban Planning Using Landsat Data (1996–2017)

Climate ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 110 ◽  
Author(s):  
Prabath Priyankara ◽  
Manjula Ranagalage ◽  
DMSLB Dissanayake ◽  
Takehiro Morimoto ◽  
Yuji Murayama
Keyword(s):  
Urban Heat Island ◽  
Metropolitan Area ◽  
Heat Island ◽  
Landsat Data ◽  
Time Points ◽  
Seoul Metropolitan Area ◽  
Urban Heat ◽  
The Mean ◽  
The Impact ◽  
The City

The urban heat island (UHI) phenomenon is an important research topic in the scholarly community. There are only few research studies related to the UHI in the Seoul metropolitan area (SMA). Therefore, this study examined the impact of urbanization on the formation of UHI in the SMA as a geospatial study by using Landsat data from 1996, 2006, and 2017. For this purpose, we analyzed the relative variation of land surface temperature (LST) with changes of land use/land cover (LULC) rather than absolute values of LST using gradient, intensity, and directional analyses. It was observed that the impervious surface (IS) has expanded, and the UHI effect was more penetrating in the study area, with considerable loss of other LULC including green surfaces along with the rapid urbanization of the study area. In this study, we divided the IS into persistent IS (PIS) and newly added IS (NAIS). The spatial distribution of the IS, forest surface (FS), PIS, and NAIS was observed based on gradient zones (GZs). The results show that GZ1 recorded a difference of 6.0 °C when compared with the GZ109 in 2017. The results also show that the city center was warmer than the surrounding areas during the period of study. Results reveal that the mean LST has a strong significant positive relationship with a fraction of IS and PIS in 2006 and 2017. On other hand, the mean LST has a strong negative relationship with a fraction of FS and NAIS in the same time points. Relatively low temperatures were recorded in FS and NAIS in both time points. Further, it was proved that the local climate of the SMA and its surroundings had been affected by the UHI effect. Therefore, urban planners of the SMA should seriously consider the issue and plan to mitigate the effect by improving the green surfaces of the city. More greening-oriented concepts are recommended in both horizontal and vertical directions of the SMA, that can be used to control the negative impact associated with UHI. The overall outputs of the study could be used as a proxy indicator for the sustainability of the SMA and its surroundings.

scholarly journals The Impact of landscape composition for urban heat island intensity in Addis Ababa City using Landsat data (1986–2016)

2019 ◽  
Vol 1 ◽  
pp. 1-1
Author(s):  
DMSLB Dissanayake ◽  
Takehiro Morimoto ◽  
Yuji Murayama ◽  
Manjula Ranagalage
Keyword(s):  
Urban Heat Island ◽  
Addis Ababa ◽  
Central Point ◽  
Heat Island ◽  
Multi Temporal ◽  
Urban Rural ◽  
Urban Heat ◽  
Surface Urban Heat Island ◽  
The Impact ◽  
The City

<p><strong>Abstract.</strong> Exploring changes in land use and land cover (LULC) in the city area and its surrounding is important to understand the variation of surface urban heat island (SUHI) and surface urban heat island intensity (SUHII). The SUHII can be calculated based on the local climate zone by using land use and land cover compossition of the city and based on the urban rural zone . The objective of this research is to examine the spatiotemporal changes of LULC and the impact of its composition for the formation of SUHI in Addis Ababa City, Ethiopia based on the urban rural zones.</p><p> The mean center of the central business district of the Addis Ababa City was considered as the central point of the study area. We represented the 30&amp;thinsp;km&amp;thinsp;&amp;times;&amp;thinsp;30&amp;thinsp;km geographical area as a study area with a 15km radius from the central point. As data sources, multi-temporal satellite data provided by the United States Geological Survey (USGS) were used in respect to the years of 1986, 2001, and 2016. In the methodology, we first completed the classification of LULC by using pixel-oriented method for the three years and the validation of the classification has been made. For the classification five LULC classes were identified such as forest, impervious surface, grass land, bare land and crop land. Afterward, land surface temperature (LST) has been computed for three years respectively. Finally, urban rural gradient zones (URGZs) have been generated as a set of polygons with 210m distance in each zone from the central point of the study area. In order to evaluate the SUHII along the URGZs in respect to the LULC, the following analyses were accomplished: (i) the relationship between mean LST and composition of the LULC was computed, (ii) the SUHII was calculated based on the LST variation of main LULC categories and the temperature difference between URGZs, (iii) multi-temporal and multi-directional SUHII was computed, and (iv) linear regression analyses were used to assess the correlations of the mean LST with composition of LULC.</p><p> The results of the analyses show that (i) distribution pattern of SUHII has changed over the study period as results of changes in LULC, and (ii) mean LST gradually declines from city centre to outside of the city , then it can be seen increasing trends due to the effect of bare lands in rural area. This pattern can be seen over the three years as the result of multi-directional approach. The methodology presented will be able to apply other cities which are showing similar growth pattern by making necessary calibration, and our finding can be used as a proxy indicator to introduce appropriate landscape and town planning in a sustainable viewpoint in Addis Ababa City.</p>

Measurement and Statistical Modeling of the Urban Heat Island of the City of Utrecht (the Netherlands)

2012 ◽  
Vol 51 (6) ◽  
pp. 1046-1060 ◽  
Author(s):  
Theo Brandsma ◽  
Dirk Wolters
Keyword(s):  
Land Use ◽  
Wind Speed ◽  
The Netherlands ◽  
Urban Heat Island ◽  
Urban Heat Island Intensity ◽  
Heat Island ◽  
Urban Heat ◽  
The Mean ◽  
View Factors ◽  
The City

AbstractMobile temperature and humidity measurements have been performed along a 14-km transect through the city of Utrecht, in the Netherlands (311 000 inhabitants), during the period March 2006–January 2009. The measurements took place on a bicycle during commuter traffic and resulted in 106 nighttime profiles (before sunrise) and 77 daytime (afternoon) profiles. It is shown how the intensity of the urban heat island depends on wind direction, cloudiness, and wind speed. Statistical models are constructed that relate the mean and maximum nighttime urban heat island intensity profiles to area-averaged sky-view factors and land use combined at both the micro- and local scales. Sky-view factors are estimated from a 0.5 m × 0.5 m surface elevation database, and land use is obtained from a 25 m × 25 m land-use database. The models are calibrated using the mobile measurements and provide estimates of the spatial distribution of the mean and maximum nighttime urban heat island intensity in Utrecht. Both models explain more than 75% of the variance. A separate nonlinear model is introduced that relates the temperature differences between the warmest part and coolest part of the transects to wind speed and cloudiness.

scholarly journals CONTRIBUTION INDEX OF LAND COVER AND LAND SURFACE TEMPERATURE CHANGES IN UPPER HILL NAIROBI, KENYA

2021 ◽  
Vol V-3-2021 ◽  
pp. 141-149
Author(s):  
P. W. Mwangi ◽  
F. N. Karanja ◽  
P. K. Kamau ◽  
S. C. Letema
Keyword(s):  
Land Cover ◽  
Urban Heat Island ◽  
Land Surface ◽  
Heat Island ◽  
Forest Land ◽  
Urban Heat ◽  
The Mean ◽  
Forest Land Cover ◽  
The Impact ◽  
Contribution Index

Abstract. Urban heat island is the difference in thermal temperature between rural and urban areas. The urbanization process alters the material type with impervious surfaces being absorbers of incoming radiation during the day and emitting it at night. The research involved the use of time-series satellite imagery from Sentinel, Landsat, ASTER and MODIS for the period 1986, 1995, 2000, 2005, 2011, 2015 and 2017 over the Upper Hill, Nairobi. Morning, afternoon and night land surface temperatures (LST) were calculated for each of these years and analyzed together with the land cover. The mean albedo was calculated to determine the relationship between each land cover and mean LST. The contribution index was calculated to determine whether a land contributed positively or negatively to the mean LST in Upper Hill. Results indicated that built-up land cover had increased from 1986 to 2017 by 0.86% per annum while forest land cover had decreased by 0.99% per annum. Sparse grassland had higher albedo and LST values of 0.81 and 27.9 °C respectively, whereas water had lower albedo and LST values of 0.09 and 25.1 °C. Water had the lowest mean LST during the day but highest mean LST in the afternoon and night in each of the years due to its high thermal capacity. Bare ground tends to have a higher contribution index compared to other land covers, while forest land cover has a negative contribution index, indicating the impact land cover types have on LST and the urban heat island effect.

scholarly journals The Impact of Anthropogenic Heat on Formation of Urban Heat Island and Energy Consumption Balance

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
P. Shahmohamadi ◽  
A. I. Che-Ani ◽  
K. N. A. Maulud ◽  
N. M. Tawil ◽  
N. A. G. Abdullah
Keyword(s):  
Energy Consumption ◽  
Urban Heat Island ◽  
Urban Areas ◽  
Natural Ventilation ◽  
Anthropogenic Heat ◽  
Urban Structure ◽  
Heat Island ◽  
Urban Heat ◽  
The Impact ◽  
The City

This paper investigates the impact of anthropogenic heat on formation of urban heat island (UHI) and also determines which factors can directly affect energy use in the city. It explores literally the conceptual framework of confliction between anthropogenic heat and urban structure, which produced UHI intensity and affected energy consumption balance. It then discusses how these two factors can be affected and gives implication to the city and then focuses on whether actions should be taken for balancing adaptation and mitigation of UHI effects. It will be concluded by making the three important strategies to minimise the impact of UHI on energy consumption: landscaping, using albedo materials on external surfaces of buildings and urban areas, and promoting natural ventilation.

scholarly journals Analysis Methodology to Mitigate the Urban Heat Island Effect in the City of Cuenca with Emphasis on Concrete Pavements

2021 ◽  
Vol 1203 (3) ◽  
pp. 032116
Author(s):  
Trotsky Narváez ◽  
Cristian Contreras ◽  
Julio Pintado Farfán
Keyword(s):  
Urban Heat Island ◽  
Meta Analysis ◽  
Construction Materials ◽  
Heat Island ◽  
The Road ◽  
Secondary Sources ◽  
Urban Heat ◽  
Object Of Study ◽  
The Impact ◽  
The City

Abstract It is evident that the consequence generated by the Urban Heat Island (UHI) in medium-sized cities with a population of more than 600,000 inhabitants generates a decrease in comfort for the user of the road network due to the increase in temperature and the difficulty of dissipating it. In the city of Cuenca there is a large number of urban roads that are rigid pavement and currently construction and maintenance projects are being generated for them, so it is necessary to seek solutions in the execution of concrete to reduce the UHI effect. The research comprehensively has two approaches: qualitative and quantitative-experimental. In the qualitative approach, the method of systematic review supported by meta-analysis of data is used to contrast information from secondary sources of case studies worldwide in Urban Heat Island, and through an outline the most common methods will be exposed. appropriate to reduce the effects of the object of study. Subsequently, this defined methodology will be put to the consideration of an expert judgment so that through its evaluation we can justify the proposed methodology. The expected result is a method of analysis and experimentation to be applied in the context of the city of Cuenca, which allows determining the effects of radiation on the construction materials of rigid pavements, defining construction strategies and types of concrete to reduce the UHI effect. The city of Cuenca accumulates large amounts of heat during the day and has difficulty dissipating it during the night, so this research seeks to propose construction alternatives and possible mitigation solutions to avoid or counteract the impact produced by the heat island through the most appropriate method.

GIS-BASED SPATIAL ANALYSIS OF URBAN HEAT ISLAND IN FUKUOKA METROPOLITAN AREA

2018 ◽  
Vol 74 (5) ◽  
pp. I_1189-I_1194
Author(s):  
Yukun WANG ◽  
Akiko NISHIMURA ◽  
Yuji SUGIHARA ◽  
Guoyun ZHOU ◽  
Yukiko HISADA ◽  
...  
Keyword(s):  
Spatial Analysis ◽  
Urban Heat Island ◽  
Metropolitan Area ◽  
Heat Island ◽  
Urban Heat
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