تحلیل خشکسالی استان ایلام بر اساس پارامتر بارش و سبزینگی

One of the parameters that alone can show drought and climate change is the precipitation parameter followed by the change in vegetation, which agriculture and natural resources and in general the growth of plants and vegetation are directly related to the change of precipitation parameter in terms of time and space. . The main purpose of this research is the consequence of changing rainfall and greenery in Ilam province. Therefore, in this research, the changes of precipitation and greenness of Ilam province during the statistical period of 2000 to 2022 have been analyzed using 12, 9, 6, 3, and 24 months (SPI) index and NDVI index. The results of the Standard Precipitation Index (SPI) for the time periods showed that the highest frequency of drought occurred in 2007, 2008, 2011, 2015, 2016, 2019 and 2021. Remote sensing data (MODIS images) were used to investigate the trend of greenness (NDVI) of vegetation during the period 2000-2022. The trend of decreasing greenness (NDVI) during the period was significant with the trend of drought index (SPI). Therefore, in terms of time, the trend of climate change in Ilam province in these two decades is a trend towards drought, and in terms of location, based on the output of two standard precipitation indices (SPI) and greenness index (NDVI), it is expanding from the southeast to the northwest of Ilam province. . Based on the research results in different regions of Ilam province, the executive bodies can plan based on the climate change process.