استخدام تقنية عن بعد لمراقبة الجفاف و أثره على الغطاء النباتي في أجزاء من غرب و جنوب المملكة العربية السعودية

الملخص EN

Therefore this study aims to use Remote Sensing (RS) technology to drought monitoring from 1984 to 2013 in some parts of west and south-west of Saudi Arabia, and to determine the most and least drought-prone areas, with disclosure of the impact of drought on vegetation by using drought indices.

So was obtained 24 imageries to cover the study area at different dates, that imageries by Taken mediated satellite Landsat TM / ETM/ OLI, it also was obtained 77 rain station data, they had been applied to four drought indices which are: Standardized Precipitation Index (SPI), Vegetation Condition Index (VCI), Temperature Condition Index (TCI), Vegetation Health Index (VHI).

The results showed that study area has suffered from drought in some years significantly, led to degradation of vegetation and eliminate it.

Also the study indicated that the most exposed years of drought were in the years 1984, 2002, and 2013.

on the other hand, the year of 1990 were the least driest.

As it was found through the application of SPI that the drought situation in the study area is generally close to normal.

Moreover, through the application of VCI,TCI, and VHI found to be suffering from a slight drought.

As it turns out that the state of health of the vegetation was good, it has not been affected by drought in 1990, while the vegetation was exposed to deterioration and decline in 2002 and 20013, but reached to the top of deterioration and decline in 2002.

However, the study recommended at the end to monitor the drought in the rest areas of the Kingdom of Saudi Arabia