Branislav Drašković

Boban Miletić

 

UTICAJ TEMPERATURNIH RAZLIKA U SLIVU NA HIDROGRAM

RIJEKE ŽELJEZNICE

 

DOI: 10.35666/28310438.2020.5.65

UDC: 911.2[551.55:556](497.6Željeznica)  

 

Abstract: The Željeznica river basin is located south of Sarajevo and covers an area of about 450 km2. It is atypical in shape, with differences in altitude between individual points of almost 1600 m, from the peaks of the mountains Treskavica and Bjelasnica to Sarajevsko polje. This fact affects the significant differentiation of temperatures in certain zones, so precipitation in the colder part of the year and at higher altitudes mainly comes in the form of snow, causing the nival retention within the basin. The paper will present research on the influence of altitude, aspect and land cover types on temperature differences by seasons in the Željeznica river basin. The relationship between temperatures on the one hand and precipitation and river flows on the other will be addressed. To obtain land surface temperatures (LST), Landsat 8 images in the period 2015-2020 were processed, as a parameter for more precise determination of temperature ranges and climatic types in the basin. The aim is to obtain the degree of "icing" of the basin and the influence that differences in temperatures by altitude zones have on changes in river flows over time, ie. on the hydrogram and river regime. The calculation of areas by elevation zones was done with the help of a digital elevation model. The data related to air temperatures and precipitation were obtained based on interpolation of data from meteorological stations within and near the river basin. The methodology for obtaining land surface temperatures is based on processing of Landsat 8 images including six steps way, primarily using GIS tool Raster Calculator. Statistical analysis determines the variation of temperature differences depending on local geographical conditions.

Key words: Željeznica, river basin, LST, hydrogram, Landsat 8.

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