Abstract:
In this paper was studied areas affected by drought using TCI, VCI and VHI. These indices are based on LST and
NDVI. Drought is one of the most widespread and least understood natural phenomena. The droughts are the
phenomena which affect large areas and remote sensing data covering large territory can be used to assess the droughts
impact and their extent. In this study was used remote sensing images from the Landsat 8 Operational Land Imager
(OLI), taken in April and May 2018. Study area, for this paper, geographically, is situated on latitude 47°32'N to
46°49'N and longitude 26°36'E to 28°05'E. This administrative unit is hit by heavy rains, floods, droughts and at larger
periods of time by landslide events and earthquakes. NDVI values indicates that vegetation has been developed between
21st April and 7th May. LST values was about the same for images analyzed for study area. VHI is usually used to detect
areas affected by severe drought. For these Landsat images analyzed was noticed that large areas were not affected by
drought. Some zones were affected by moderate and mid drought – about the same for April and May. For these areas
were made analysis to determine any connections between drought and altitude, gradient of slopes and exposure of
slopes. Areas affected by moderate and mid drought have slope between 00
and 7.50
, mostly between 50
and 7.50
. Zones
with slopes over 7.50
affected by drought is insignificant. Exposure of slopes for areas affected by drought is
preponderant east and north-east.
