Összesen 2 találat.


001-es BibID:BIBFORM031225
Első szerző:Balázs Bernadett
Cím:Simulation of the mean urban heat island using 2D surface parameters : empirical modeling, verification and extension / Balázs Bernadett, Unger János, Gál Tamás, Sümeghy Zoltán, Geiger János, Szegedi Sándor
Megjegyzések:The spatial distribution of the annual mean urban heat island (UHI) intensity was simulated applyingempirical models based on datasets from urban areas of Szeged and Debrecen, using simple and easily determinable urbansurface cover variables. These two cities are situated on the Alföld (Great Hungarian Plain) and have similar topographicand climatic conditions. Temperature field measurements were carried out, Landsat satellite images were evaluated, and thenone- and multiple variable models were constructed using linear regression techniques. The selected multiple-parametermodels were verified using independent datasets from three urban settlements. In order to obtain some impression of themean UHI patterns in other cities with no temperature measurements available, the better model was extended to urbanareas of four other cities situated in geographical environments similar to Szeged and Debrecen. The main shortcomingof typical empirical models, namely that they are often restricted to a specific location, is overcome by the obtainedmodel since it is not entirely site but more region specific, and valid in a large and densely populated area with severalsettlements.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
mean urban heat island
satellite images
urban surface cover parameters
geoinformatic methods
Megjelenés:Meteorological applications. - 16 (2009), p. 275-287. -
További szerzők:Unger János Gál Tamás Mátyás Sümeghy Zoltán Geiger János Szegedi Sándor (1970-) (klimatológus)
Internet cím:Szerző által megadott URL
Intézményi repozitóriumban (DEA) tárolt változat


001-es BibID:BIBFORM033086
Első szerző:Unger János
Cím:Comparison and generalisation of spatial patterns of the urban heat island based on normalized values / János Unger, Zoltán Sümeghy, Sándor Szegedi, Andrea Kiss, Róbert Géczi
Megjegyzések:The studied medium-sized cities (Szeged and Debrecen, Hungary) are located on a low and flat plain. Datawere collected by mobile measurements in grid networks under different weather conditions betweenApril 2002 and March 2003 in the time of maximum development of the urban heat island (UHI). Tasksincluded: (i) interpretation and comparison of the average UHI intensity fields using absolute and normalizedvalues; (ii) classification of individual temperature patterns into generalized types by cities usingnormalization and cross-correlation. According to our results, spatial distribution of the annual and seasonalmean UHI intensity fields in the studied period have concentric shape with some local irregularities.The UHI pattern classification reveals that several types of the structure can be distinguished inboth cities. Shifts in the shape of patterns in comparison with the centralized pattern are in connectionwith the prevailing wind directions.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
Urban heat island
UHI types
Megjelenés:Physics and chemistry of the earth. Part B. Hydrology, oceans and atmosphere. - 35 (2010), p. 107-114. -
További szerzők:Sümeghy Zoltán Szegedi Sándor (1970-) (klimatológus) Kiss Andrea (Szeged) Géczi Róbert
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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