Landslide Assessment, Susceptibility Analysis and Recommendation of Remedial Measures for Jimma-Chida Road Segment, South-West Ethiopia
| dc.contributor.advisor | Tezera Firew (PhD) | |
| dc.contributor.author | Lemenew Minale | |
| dc.date.accessioned | 2024-07-31T08:27:44Z | |
| dc.date.available | 2024-07-31T08:27:44Z | |
| dc.date.issued | 2024-05 | |
| dc.description.abstract | In Ethiopia, landslides, mostly demonstrated as rock fall, earth slide, debris, and mudflow, are prevalent in the central, south-southwest, and north-northwest highlands, especially after intense rainy season. Jimma-Chida road section which is studied in this paper is located in southern highlands and lies in Gibe and Gojeb River Basins where landslide incidence occurred frequently. This work studied the active landslide areas along Jimma-Chida road by assessing their features, failure mechanism and extent of the landslides. Landslide susceptibility map is produced by weighting factors that contribute to the landslide using Analytical Hierarchy Process(AHP) method and integrating it with the existing landslide inventory data. For this purpose, key factors (lithology, elevation, rainfall, slope, slope aspect, land use/ cover, distance to stream, distance to road and curvature) are considered and weighted after dividing into sub-factors using AHP. Then the causative factor layers are overlaid using weighted overlay technique in ArcGIS environment to produce the landslide susceptibility map. From the assessment of the existing landslide it is revealed that slope angle (90-140), slope aspect(Northwest), elevation (2388-2732 m), curvature(flat), lithology (residual soil of upper basalt flow), distance to stream (50 m), distance to road (50 m), land use/cover (crops) and rainfall (1600-1675 mm) have higher contribution for the occurrence of the active landslide. Based on AHP for landslide susceptibility map, distance to the stream, distance to the road and rainfall are the most contributing factors with weight 0.203,0.197 and 0.199, respectively. The other influential factor is lithology with weight of 0.167, followed by slope angle, aspect, elevation, curvature, land use/cover with the weight 0.073,0.023,0.023 and 0.059, respectively. The landslide susceptibility map concludes that Jimma-Chida road section is classified as low (32.23%), moderate (62.87%), high (4.89%), and very low and very high susceptibility zones are covered a very small and localized areas. Finally, modification of the slope geometry, provision of both surface and sub-surface drainage, provision of retaining structure and internal reinforcement of slope are recommended as a preliminary remedial measure for the area affected by landslide. | |
| dc.identifier.uri | https://etd.aau.edu.et/handle/123456789/3341 | |
| dc.language.iso | en_US | |
| dc.publisher | Addis Ababa University | |
| dc.subject | Landslide Susceptibility Map | |
| dc.subject | ArcGIS | |
| dc.subject | Analytic Hierarchy Process (AHP) | |
| dc.title | Landslide Assessment, Susceptibility Analysis and Recommendation of Remedial Measures for Jimma-Chida Road Segment, South-West Ethiopia | |
| dc.type | Thesis |