Evaluation of Land Degradation Around Deber Zeyit Area Using Rs and Gis Techniques

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Addis Ababa Universty


Gully development dynamics that occurred from 1971 to 2002 around the Debre Zeyit area were evaluated using remote sensing and GIS in addition to field verification. The study was conducted in about 694-km2 area with in the East Showa Zone of the Oromia Region. The main objective of this study is to understand the rate, cause and extent of gully erosion around Debre Zeyit area in terms of change in landcover, development of infrastructure, soil type and geology of the area. Four sets of remotely sensed images, MSS-1973, TM-1986 & 1995 and ETM+ 2002 are used in evaluation of the change in landuse and landcover of the area with in of 13, 9 and 7 years gaps and Aerial photographs of 1971 as well as the 2002 ETM+ image are used in gully development rate mapping. In addition to this field measurement of gullies width and depth volume calculation is done to quantify the amount of soil lost by all gullies and rate of soil loss by new gullies with in 31 years gap. Results of landcover change analysis show cultivated land increased from 50% in 1971 to 55% in 1986 and to 67 and 69% in 1995 and 2002 respectively. The overall increase in cultivated land is about 19%, which was mainly at the expense of grasslands and dense shrub covers. The area which was mainly covered by the dense shrubs is changed to open woodland and cropland. The size of urban and water bodies increased from 1.04% to 1.7% and 0.73% to 1.02% percent due to population increase and construction of dams respectively. The area covered by wetland also show minor differences in size due to evaporation. New gullies are developing in areas where the original landcover is removed and where slopes are between 2 and 10 percent. In addition to this on the southern part of the study area construction of roads are important causes of gulling where the soil type and lithology are favoring erosion processes.



Rs and Gis Techniques