Determination Drought indices of Evaporative Stress Index (ESI) and Vegetation Health Index (VHI) in the Tuyserkan catchment using MODIS Satellite Images

Drought can determined with impact of reduce rainfall and effective of available water shortage for plant. Drought mapping will be effective in water resources management in Regional and National level. Zoning maps of drought on water resources management, Regional and National level will be effective. Also use of remote sensing techniques can be display classified and mapping drought, as well as. In this regard, the use of drought indices that determined with remote sensing are the useful. The purpose of this study is to measure two drought indices of evaporative stress (ESI) and health vegetation (VHI) and compliance with the standardized precipitation index (SPI) in Tuyserkan catchment in Hamadan. For this purpose, 32 MODIS satellite image was used from 2003 to 2010. The results showed that the standardized precipitation index changes had complied by two drought indices of evaporative stress and vegetation health in during 8 years. Finally mapping of drought were show in Tuyserkan catchment to 2003-2010. Maps showed that the class changes of the drought were focuses in the central catchment that there were maximum vegetated.