scholarly journals IDENTIFIKASI IKLIM MIKRO DAN KENYAMAN TERMAL RUANG TERBUKA HIJAU DI KENDARI

NALARs ◽  
2019 ◽  
Vol 18 (1) ◽  
pp. 23
Author(s):  
Santi Santi ◽  
Siti Belinda ◽  
Hapsa Rianty
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Open Space ◽  
Heat Island ◽  
Open Spaces ◽  
Temperature Humidity Index ◽  
Humidity Index ◽  
Urban Heat ◽  
The City

ABSTRAK. Fenomena UHI (Urban Heat Island) mengakibatkan suhu udara perkotaan menjadi tinggi, sehingga menurunkan kualitas lingkungan kota. Untuk dapat meningkatkan kualitas kota dan mengimbangi pertumbuhan kota, maka pemerintah menggalakkan pengembangan infrastruktur hijau perkotaan melalui pengembangan Ruang Terbuka Hijau (RTH). Kota Kendari memiliki beberapa ruang terbuka yang beberapa diantaranya merupakan pusat aktifitas dan interaksi masyarakat kota, diantaranya Taman Walikota dan Pelataran Tugu Religi. Penelitian ini merupakan penelitian deskriptif untuk mengetahui kondisi iklim mikro dan kenyamanan termal ruang terbuka. Data-data yang dikumpulkan berupa karakteristik dan nilai indikator iklim mikro yang meliputi suhu udara, kelembaban relatif, dan kecepatan angin pada sejumlah titik ukur pada siang hari. Data yang dikumpulkan dianalisis menggunakan uji Statistik Independent T Test untuk mengetahui perbedaan iklim mikro antara kedua lokasi dan analisis Temperature Humidity Index (THI) untuk mengetahui tingkat kenyamanannya. Hasil dari uji statistik menunjukkan tingkat perbedaan yang tidak sigifikan antara kedua lokasi, meliputi suhu udara (sig.=0,283); kelembaban relatif (sig.=0,115); dan kecepatan angin (sig.=0,105). Sementara itu, melalui analisia THI menunjukkan nilai index tidak nyaman hampir terjadi pada keseluruhan titik ukur. Nilai THI tertinggi pada lokasi Taman Walikota terletak pada titik A5 (THI=31,9), yaitu pada daerah memiliki kecepatan angin rendah karena posisinya pada bagian tengah kawasan. Sedangkan pada lokasi pelataran Tugu Religi, nilai terendah THI diperoleh pada titik B9 (THI=33,12), yakni titik yang sebagian besar material permukaan lahannya berupa aspal. Kata kunci: ruang terbuka, temperatur, angin, kelembaban relatif, Temperature Humidity Index ABSTRACT. The UHI (Urban Heat Island) phenomenon affected urban air temperatures become high, which decreases the quality of the city environment. To be able to improve the quality of the city and to balance the growth of the city, the government promotes the development of urban green infrastructure through the development of Green Open Space (RTH). Kendari City has several open spaces, some of which are the center of the activities and interactions of urban communities, including the Taman Walikota and the Pelataran Tugu Religi. This research is a descriptive study to determine the microclimate conditions and thermal comfort of open spaces. The data collected is in the form of characteristics and values of microclimate indicators which include air temperature, relative humidity, and wind speed at some measuring points during the day. The collected data were analyzed using the Independent T-Test Statistic Test to determine the differences in microclimate between the two locations and the Temperature Humidity Index (THI) analysis to determine the level of comfort. The results of the statistical tests show a significant level of difference between the two locations, including air temperature (sig. = 0.283); relative humidity (sig. = 0.115); and wind speed (sig. = 0.105). Meanwhile, through THI analysis, the uncomfortable index value almost occurs at the whole measuring point. The highest THI value in the location of the Taman Walikota is located at point A5 (THI = 31.9), which is in the area with low wind speed because of its position in the central part of the city. Whereas in the location of the Pelataran Tugu Religi, the lowest value of THI is obtained at point B9 (THI = 33.12), which is the point where most of the surface material in the land is asphalt. Keywords: open space, temperature, wind, relative humidity, Temperature Humidity Index 

scholarly journals Hubungan Dominansi Pohon dengan Temperature Humidity Index (Thi) Di Hutan Kota Babakan Siliwangi Bandung Jawa Barat

2020 ◽  
Vol 21 (2) ◽  
pp. 135
Author(s):  
Raizal Fahmi Solihat ◽  
Muhamad Elvan Nurfajri
Keyword(s):  
Open Space ◽  
Physical Development ◽  
Open Spaces ◽  
Forest Park ◽  
Comfort Index ◽  
Temperature Humidity Index ◽  
Temperature And Humidity ◽  
Humidity Index ◽  
The Relationship ◽  
The City

Physical development in the city of Bandung which is increasing causes a decrease in green open space. Babakan Siliwangi Bandung City Forest is one of the green open spaces so it is necessary to know the correlation between tree dominance and the Temperature Humidity Index (THI) value in the formation of micro climates. The object research is to determine the relationship between tree dominance and THI. The method by vegetation analysed, measuring temperature and humidity. The results of research are: 1) Comfort index (THI) in the Babakan Siliwangi City Forest Park in Bandung in August 2017 is relatively comfortable <26 THI. 2) The correlation value of tree dominance with THI is -0.14 which means that there is no relationship between the dominance value and THI. Keywords : Tree, Forest urban, THI, Bandung 

Spatial Model of Green Open Space Needs for Mitigation of Urban Heat Island Phenomenon in Semarang

2019 ◽  
Author(s):  
Bandi Sasmito ◽  
Yudo Prasetyo ◽  
Nurhadi Bashit ◽  
Titis Ismayanti
Keyword(s):  
Urban Heat Island ◽  
Spatial Model ◽  
Open Space ◽  
Model Simulation ◽  
Land Use Changes ◽  
Heat Island ◽  
Air Temperatures ◽  
Urban Heat ◽  
Space Requirements ◽  
The City

Increasing population of the can be effect to an increase in space requirements. Fulfilling space needs means that what happens is a land use changes. green land becomes a need for development land and is the cause of the effect of rising air temperatures in cities. These changes are very important to studying for make plans on city. This study intends to examine the needs of Green Open Space spatially based on the phenomenon of increasing temperature in a location within the city compared to its surroundings or called Urban Heat Island (UHI). Remote Sensing is used to detect UHI spatially. This UHI location will be used as spatial modeling data to assess how large and where is need green space. The expected processing results are a spatial model simulation of the adequacy of Green Open Space requirements that will be a mitigation of the UHI phenomenon that is presented spatially in the form of thematic maps as one of the data that can be used as consideration in the city design planning of Semarang in the long term.

scholarly journals Microclimate in silvipastoral systems with eucalyptus in rank with different heights

2010 ◽  
Vol 39 (3) ◽  
pp. 685-694 ◽  
Author(s):  
Wander de Souza ◽  
Orlando Rus Barbosa ◽  
Jair de Araújo Marques ◽  
Marco Aurélio Teixeira Costa ◽  
Eliane Gasparino ◽  
...  
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Air Temperature ◽  
Thermal Load ◽  
Heat Load ◽  
Temperature Humidity Index ◽  
Heat Load Index ◽  
Humidity Index ◽  
Globe Temperature ◽  
Black Globe Temperature

The aim of this work was to verify if the presence of trees and its height in formed silvipastoral systems with eucalyptus planted in rank can modify the microclimate and improve the environment for bovine raising during the day in summer. It was evaluated the microclimate of the environment in formed silvipastoral systems in rank of eucalyptus with 8 m, 18 m and 28 meters of height, compared to a system no shade in the summer. The experimental design was a split plot with six hour time in sub parcels. The systems are made up of parcels and the months as block in four replications and the interaction hour × system. The air temperature, black globe temperature, relative humidity and wind speed were observed to create the following indexes for thermal comfort: temperature-humidity index; black globe-humidity index; heat load index and the radiant thermal load. Excepted for the relative humidity, there was interaction for time × system for all variables and indexes. Interaction occurred for: air temperature at 10 a.m. and 6 p.m.; wind speed from 8 a.m. to 4 p.m.; temperature humidity index at 10 a.m. and 12 p.m.; black globe temperature, black globe humidity index, heat load index, and radiant thermal load at all the hours. During the summer, the system with shade of 28 m trees had the lowest average of black globe temperature; wind speed; black globe humidity index; radiant thermal load index; and heat load index. There was a reduction of wind speed average in systems 8 m, 18 m and 28 m trees in, respectively, 20.7; 50.0 and 48.0% in relation to no shade system; however it was not proportional to the height, with influence of the rank porosity and pantries height. Nevertheless, for radiant thermal load index the reduction was proportional to the height of the trees with 10.24; 12.49 and 20.76%, respectively, for 8 m, 18 m and 28 meters of height. There was a reduction of the thermal stress in the environment due to the presence of trees, being the heat load index thermal the index that better demonstrated the effect, despite of not being proportional to the rank height.

scholarly journals Variações Termo-Higrométricas e Estudo de Ilha de Calor Urbana na Cidade de Bragança-PA e Circunvizinhança (Thermo-Hygrometric Variations and Study of Urban Heat Island in the City of Bragança-PA and Surrounding Region)

2016 ◽  
Vol 9 (2) ◽  
pp. 571
Author(s):  
Abnoã Da Costa Costa ◽  
Hernani Rodrigues ◽  
Jefferson Costa ◽  
Paulo Souza ◽  
Joao Silva Junior ◽  
...  
Keyword(s):  
Air Temperature ◽  
Meteorological Parameters ◽  
Heat Island ◽  
Urban Centers ◽  
Heat Islands ◽  
Urban Heat ◽  
Relationship Of ◽  
The Relationship ◽  
The City

Estudou-se algumas variáveis e parâmetros meteorológicos no período de 17 a 21 de novembro de 2014, na cidade de Bragança-PA e circunvizinhança, com a finalidade de entender como elas interferem no microclima da cidade e com isso fazer um estudo com a finalidade de obter uma breve característica do microclima na região. Os resultados mostraram que houveram diferenças de temperaturas entre os pontos, ou seja, algumas características de cada local influenciaram no aumento ou diminuição da temperatura do ar. A relação dos dados com as características de uso e ocupação do solo demonstrou uma influência significativa onde havia vegetação, devido a diminuição da temperatura do ar noturna e, consequentemente, minimização das ilhas de calor. Foi verificado também que as áreas com maior ocupação com construções e com maior pavimentação perderam menos calor, levando à formação de pequenas ilhas de calor noturnas mais intensas. Assim percebeu-se que na cidade, bem como aquelas que passaram por processos de urbanização, segundo literatura, possuem ilha de calor, que consiste em temperaturas mais elevadas durante a noite, causando assim o desconforto humano. Com isso, as alterações microclimáticas na cidade de Bragança-PA, assim como em outros centros urbanos, em geral são causadas pela ação antrópica e que interferem na qualidade de vida da população. Este trabalho é importante para a publicação nesta revista devida a sua contribuição cientifica para a sociedade.     A B S T R A C T We studied some variables and meteorological parameters in the period from 17 to 21 November 2014 in the city of Bragança-PA and surrounding region, in order to understand how they impact on the city's microclimate and thus make a study for the purpose of get a brief characteristic of the microclimate in the region. The results showed that there were differences in temperature between the points, that is, some features of each local influence on the increase or decrease of air temperature. The relationship of the data with the characteristics of use and land cover showed a significant influence where there was vegetation, because influenced the decrease in the night air temperature and thus minimize heat islands. It was also found that the areas with higher occupancy with buildings and more paving lost less heat, leading to the formation of smaller more intense nocturnal heat islands. So it was noticed that in the city, as well as those who have gone through processes of urbanization, according to literature, have heat island, consisting of higher temperatures during the night, thus causing certain human discomfort. With that, the microclimate changes in the city of Bragança-PA, as well as other urban centers in general are caused by human activities that interfere with people's quality of life. This work is important for publication in the magazine due to their scientific contribution to society Keywords: Bragança-PA, heat island, air temperature.   

scholarly journals Evaluasi dan re-disain tipologi ruang terbuka hijau (kasus daerah perkotaan di Provinsi Papua Barat)

Cassowary ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 147-161
Author(s):  
Marlina Rumiris ◽  
Roni Bawole ◽  
Thomas Pattiasina
Keyword(s):  
Urban Areas ◽  
Open Space ◽  
Economic Value ◽  
Open Spaces ◽  
Local Climate ◽  
Papua Barat ◽  
Qualitative Exploration ◽  
The City ◽  
The Ideal

In general, the presence of green open space as one element in the urban spatial is very weak and the potencial is reduced portion because they do not have a high economic value. One function of green open space is for micro-climate amelioration, making green open space as a lugs of the city for helping the formation of a cool and comfortable climate in the vicinity. This comfort is determined by the interdependence between the factors of air temperature, air humidity, light and wind movement. Vegetation can improve the quality of the local climate or reducing temperature named micro-climate amelioration function as well. This study aimed to evaluate and redesign the typology of green open space to create green resolution with conversion of carbon to compansate for changes in the landscape that occur as a result of ongoing development. The study was conducted in urban areas of West Papua Province with five cases were selected purposively. Refers to the Ministry of Public Work No. 5 of 2008 and some related references, the results of research (qualitative exploration research) showed that 3 of the 5 cases have not met the ideal typology of Green Open Spaces, while two other cases have met the ideal typology for ecological function, but remain in need of the final material. Redesigns of Green Open Spaces that has been generated from this study are expected to restore ecological functions with holding the ecologycal aspect as a priority matter to consider as well. Therefor those can be used by local goverments for planning repairs or improvements in the future.

scholarly journals EVALUASI FUNGSI EKOLOGIS DAN ESTETIKA BEBERAPA RUANG TERBUKA HIJAU PUBLIK DI KOTA TASIKMALAYA

2019 ◽  
Author(s):  
INTAN NUR FATHONAH
Keyword(s):  
Open Space ◽  
Research Result ◽  
High Growth ◽  
Open Spaces ◽  
Scenic Beauty ◽  
Average Temperature ◽  
Recreation Area ◽  
Humidity Index ◽  
And Function

The existance of green open space as climate amelioration is important in a city with high growth of population such as Tasikmalaya City. Population growth can decreasing environmental quality. The public green open spaces existence is important to give a comfortable recreation area but the three green open spaces, central recreation area of Tasikmalaya society, have not met optimal thermal and aesthetic comfort yet as society preference. The aims of this research is to identify species and function of vegetation, evaluate ecological and aesthetic functions of the green open spaces, and give vegetation improvement recommendations for the green open spaces. This research located in Alun-alun, Taman Kota, and Kompleks Olahraga Wiradadaha Tasikmalaya City. The research methods are inventory, analyse the inventory data by Key Performance Index (KPI); Thermal Humidity Index (THI); Scenic Beauty Estimation (SBE); descriptive, and give the vegetation improvement recommendation. The research result showed that Kompleks Olahraga Wiradadaha has the most species and quantity of vegetation. Kompleks Olahraga Wiradada is the best in modification, humidity control, and noise reducing function meanwhile Taman Kota is the best in wind barrier function than other green open spaces. The three green open spaces qualified as a thermal comfort zone based on standard THI and they also have meet the standard noise of recreation area. Overall they can decreasing the average temperature until 1.4 ˚C, increasing the average humidity until 8 %, and reducing the average noise until 4.4. Taman Kota has the best quality of landscape aesthetic and Kompleks Olahraga Wiradadaha has the worst quality of landscape aesthetic. Visitors satisfied enough with the green open spaces but those can be better with more shaded vegetation especially in Alun-alun and Taman Kota, more aesthetic vegetation, and better facilitation. Alun-alun and Taman Kota need more shaded vegetation. The three green open spaces need more variation in aesthetic vegetation, and a better landscape elements composition and layouting.

scholarly journals Variação Microclimática de Sítios Urbanos com Diferentes Níveis de Cobertura Vegetal Como Subsídio à Formação de Ilha de Calor

2020 ◽  
Vol 13 (07) ◽  
pp. 3254
Author(s):  
Pedro Hugo Oliveira Moreira ◽  
Alan Cavalcanti da Cunha ◽  
João De Athaydes Silva Júnior ◽  
Antonio Carlos Lola da Costa
Keyword(s):  
Land Use ◽  
Relative Humidity ◽  
Urban Heat Island ◽  
Urban Space ◽  
Vegetation Index ◽  
Data Series ◽  
Heat Island ◽  
Urban Heat ◽  
Meteorological Elements ◽  
The City

O objetivo da investigação é analisar variações espaciais e sazonais de elementos meteorológicos que evidenciam a formação e ocorrência do fenômeno da Ilha de Calor Urbana (ICU) na cidade de Macapá. A metodologia de estudo avaliou a evolução histórica da cobertura de vegetação e da malha urbana utilizando-se técnicas de geoprocessamento e de classificação supervisionada de Máxima Verossimilhança (MAXVER). Com este objetivo foram analisadas séries de dados contínuos coletados durante dez dias consecutivos nos períodos chuvoso (Abril/2018), Seco (Novembro/2018) e Transição (Junho/2019). Os elementos meteorológicos quantificados foram a umidade relativa do ar (UR) e a temperatura média do ar (T). Cinco estações semi-automáticas foram estrategicamente distribuídas ao longo de dois eixos de máximo prolongamento da zona urbana de Macapá, nos sentidos Nordeste-Sudoeste e Oeste-Leste. Os resultados indicaram significativa variação sazonal da Temperatura e da Umidade Relativa (p<0,05). Espacialmente, os resultados também foram significativos (p<0,05), sugerindo influência espaço-sazonal dos padrões de variabilidade de T e UR sobre ICU correlacionados com as taxas de uso e ocupação do solo. Assim, ICU mostrou-se significativamente dependente tanto do índice de vegetação (R2=0,47, p<0,05) quanto do índice de urbanização (R2=0,62, p<0,05). Conclui-se que a sazonalidade diária observada sugere existência do fenômeno da ilha de calor urbana, especialmente nas zonas central e sul da cidade, cujos índices inclusive têm sido confirmados por estudos similares. Os dados de sazonalidade dos elementos meteorológicos analisados, sua relação com o uso do solo, podem trazer elementos importantes para o debate sobre a formação da ICU nas cidades amazônicas. Microclimatic Variation in Urban Sites with Different Levels of Vegetable Cover as a Subsidy to the Formation of Heat Island A B S T R A C TThe objective of the investigation is to analyze spatial and seasonal variations of meteorological elements that evidence the formation and occurrence of the phenomenon of the Urban Heat Island (UHI) in the city of Macapá. The study methodology comprised the historical evolution of vegetation cover and urban space using geoprocessing techniques and supervised classification of Maximum Likelihood (MAXVER). With this objective, continuous data series collected during ten consecutive days in the rainy (April/2018), Dry (November/2018) and Intermediate (June/2019) periods were analyzed. The meteorological elements quantified were relative humidity (RH) and average air temperature (T). Five semi-automatic gauges were strategically distributed along two axes of maximum extension of the urban area of Macapá, in the Northeast-Southwest and West-East directions. The results indicated significant seasonal variation of Temperature and Relative Humidity (p<0.05). Spatially, the results were also significant (p<0.05), suggesting influence of T and RH variability patterns on UHI correlated with land use and occupation rates on. Thus, ICU was significantly dependent on both the vegetation index (R2=0.47, p<0.05) and the urbanization index (R2=0.62, p<0.05). We concluded that the daily seasonality observed suggests the existence of the phenomenon of the urban heat island, especially in the central and southern zones of the city, whose indices have even been confirmed by similar studies. The seasonality data of the meteorological elements analyzed, their relationship with land use, can bring important elements to the debate on the formation of ICU in Amazonian cities.Keywords: Meteorological element, vegetation, urbanization, urban heat island, Macapá.

scholarly journals Analisis Tingkat Kenyamanan Di DKI Jakarta Berdasarkan Indeks THI (Temperature Humidity Index)

2017 ◽  
Vol 15 (1) ◽  
pp. 57 ◽  
Author(s):  
Trinah Wati ◽  
Fatkhuroyan Fatkhuroyan
Keyword(s):  
Thermal Comfort ◽  
Residential Area ◽  
Comfort Level ◽  
Climate Data ◽  
Average Percentage ◽  
Temperature Humidity Index ◽  
Humidity Index ◽  
Urban Heat ◽  
The City

ABSTRAKFenomena iklim mempengaruhi kenyamanan fisiologis di daerah pemukiman. Analisa tingkat kenyamanan di DKI Jakarta dilakukan menggunakan THI (Temperature Humidity Index). Berdasarkan data iklim periode 1985 – 2012 stasiun Kemayoran, Tanjung Priok, Halim, Cengkareng dan Pondok Betung, hasil penelitian menunjukkan rata-rata prosentase tingkat kenyamanan harian dengan kategori tidak nyaman sebesar 22,1 % (81 hari per tahun), sebagian nyaman 71 % (259 hari per tahun) dan nyaman 7,1% (26 hari per tahun). Tingkat kenyamanan menunjukkan semakin ke tengah kota semakin besar prosentase tidak nyaman. Selama periode tersebut terjadi kecenderungan peningkatan indeks THI dengan signifikansi > 50% menunjukkan tingkat kenyamanan di DKI Jakarta cenderung semakin tidak nyaman.Kata kunci: tingkat kenyamanan, temperature humidity index, urban heat islandABSTRACTClimate phenomenon affects physiological comfortableness in residential area. Analysis of thermal comfort level in DKI Jakarta were conducted using THI (Temperature Humidity Index).  Based on climate data stations in Kemayoran, Tanjung Priok, Halim, Cengkareng dan Pondok Betung during 1985-2012 showed that the average percentage of daily thermal comfort level with categories uncomfortable were 22,1% (81 days per year), half comfortable 71 % (259 days per year) and comfortable 7,1% (26 days per year). The study showed that the greater percentage uncomfortable level, the closer into the center of the city and during 1985 to 2012 the THI index tend to increasing with significant level more than 50% meant that the thermal comfort level tend to more uncomfortable.Keywords: thermal comfort level, temperature humidity index, urban heat islandCitation: Wati, T dan Fatkhuroyan. (2017). Analisis Tingkat Kenyamanan Di DKI Jakarta Berdasarkan Indeks THI (Temperature Humidity Index). Jurnal Ilmu Lingkungan, 15(1), 57-63, doi:10.14710/jil.15.1.57-63

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.

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