Landslide Hazard Zonation Using Gis Techniques In Jeldu Woreda West Showa Zone Oromia Ethiopia

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The main objective of the present study was to identify, evaluate and prepare a LandslidernHazard Zonation (LHZ) map of Goro Kebele of Jeldu Woeda, western Showa Zone, OromiarnRegion, Ethiopia by using a geographic information system (GIS) Techniques. Accordingly,rnthirty-four landslides have been identified and mapped in the study area. The failurernmechanisms of each landslide were defined and their relation with different governingrnparameters; slope, aspect, land use/cover, lithology, soil material, and elevation were alsornrecognized. Later, the collected data was arranged and prepared into layered spatial GISrndatabase for the preparation of landslide hazard mapping. The governing parameters; aspect,rnslope and elevation, were calculated from the digital elevation model (DEM) of the area,rnwhich was obtained from the 30 m x 30m LANDSAT TM8 elevation data set. The lithologyrnmap of the area was modified from the general geological map of Ethiopia (1:2,000,000;rn1996), while the material deposit and land use/cover maps were processed from Land sat TMrnsatellite using different digital image processing procedures. Springs were also mapped andrnfurther analyzed with respect to the location of the landslides.rnThe aspects classes, slope class, material deposit, elevation, lithology and landuse/cover werernalso analyzed to find the correlation with the landslide occurrence in the area. Similarly, thernanalysis of relational characterization was made and the concentration of landslides withrnrespect to elevation range of springs was deduced. In this study, GIS based statistical andrnprobability approach was used to rate the governing parameters and then customized rasterrncalculation was applied to develop the landslide hazard map. Later, validation of this maprnwas made with the actual landslide inventory data.rnThe resulting landslide hazard map revealed that 12% (5.6km2) of the study area show nornhazard, 27%(12.7km2) as low hazard, 31% (14km2) as moderate hazard, 21% (10km2) as highrnhazard while the rest 8%(3.8km2) as very high hazard. When the thirty-four landslides arernconsidered to validate the landslide hazard map, 92% of them fall either in the high or veryrnhigh hazard zones, while the 6% fall in medium and only 2% in low hazard zones. Thisrnsatisfactory agreement confirmed the rationality of the considered governing parameters,rntheir influential weight, the adopted methodology, tools and procedures in developing thernlandslide hazard map in the study area. Thus, the LHZ map, prepared during present study,rnmay practically be applied for regional planning and designing preventive measures.

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Landslide Hazard Zonation Using Gis Techniques In Jeldu Woreda West Showa Zone Oromia Ethiopia

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