دور نظم المعلومات الجغرافية والاستشعارعن بعد فى رصد ومقاومة التصحر

Abstract

This study was conducted in northwestern Libya in the area located south of Tripoli and south of Tajura. This study relied on the use of satellite imagery, the American satellite imagery Landsat TM7 was used for the year 1997, 2006, which was subjected to many improvements in order to reach explanations explaining the state of desertification in the area. after the improvement operations were carried out the non-directed classification and directed classification process, through which the region was classified into six classes which are: urban areas, weed areas, uncovered soil areas, dense forest areas, light forest areas, sand areas, then calculate the area of each variety and attributed The percentage in each year (1997, 2006) and knowledge of the change in each variety and in each year, and the percentage of desertification in each year and its annual rate is known. Through the results obtained we find that the weed areas are the most varieties in which the change occurred where It decreased by 4349.27 hectares during 9 years, followed by urban areas that increased by 3508.99 hectares, then sandy areas that increased by 1569.88 hectares, followed by dense forest areas which decreased by 1274.42 hectares, then the exposed soil areas which increased by 294.55 hectares, then light forest areas which increased by 250.27 hectares. Through these results, we note that pain The regions in which the increase in the area occurred contribute to the increase in the desertification process, as well as the areas where the decrease in the area has contributed to the increase in the desertification process, and therefore we find that the desertification process exists in the study area where the results obtained indicate that the area of desertified lands in the year 1997 is 17748.09 hectares while In the year 2006, it reached 23,121.51 hectares, i.e. an increase of desertified lands by 5373.42 hectares during 9 years, at an annual rate of increase of 597.04 hectares, and if desertification continues in the region at the same rate without taking any measures to combat desertification encroachment on the areas threatened by desertification and adjacent to these areas, the region will flow Fully desertified after about 32 years from 2006, meaning that the region will be almost entirely desertified in 2038. This warning is directed to the competent authorities in order to take the necessary measures to combat desertification in all its forms because if the region is subject to complete desertification, it is very difficult to address the problem and reclaim land Because it has turned into a completely unproductive situation and this can only be reclaimed at exorbitant costs and on limited areas.