Soil Erosion Hazard Assessment Using Usle Model: A Case Study of Legedadi & Dire Reservoir Catchment
| dc.contributor.advisor | Suryabhagavan, K.V. (PhD) | |
| dc.contributor.author | Chemeda, Samuel | |
| dc.date.accessioned | 2018-07-10T11:51:38Z | |
| dc.date.accessioned | 2023-11-09T14:09:44Z | |
| dc.date.available | 2018-07-10T11:51:38Z | |
| dc.date.available | 2023-11-09T14:09:44Z | |
| dc.date.issued | 2007-07 | |
| dc.description.abstract | Siltation due to erosion is the major problem facing many of the lakes and reservoirs in Ethiopia today. The erosion process in Legedadi and Dire catchment transports a lot of sediment to the reservoir and is the most important factor for reducing their storage capacity. The two-reservoir catchments are in a state of physical and biological deterioration due to over exploitation of lands by the inhabitants. A considerable part of the sediment load is due to present agricultural and livestock management practices and lack of soil conservation practices. Therefore, a reservoir catchment needs to be managed effectively in order to reduce the effect of sedimentation. This study has integrated the USLE model and GIS techniques to assess erosion hazards in Legedadi and Dire Catchment. Soil loss estimation was carried out based upon the principles defined in the USLE, which relates soil erosion process to rainfall Erosivity, soil erodibility, topographic, land cover and conservation practices. The input parameters of the model, derived from GIS analysis of primary data, were compiled in GIS database in raster data model with grid resolution of 30 meters. The spatial thematic map of the respective factors of USLE was created as following: R factor map was interpolated from point data of station; K factor map by reclassification of soil map; LS factor, relief parameters, was derived from DEM; C and P factor map by reclassification of landuse/ land-cover map of Landsat ETM+. The assessment approach involved two aspectsestimation of potential and actual erosion. After application of USLE model, the potential and actual mean annual soil loss from the catchment was found to be 120t/ha/yr and 4.8t/ha/yr, respectively. From the level of soil tolerance limits set by Hurni (1986), mean annual soil loss estimated by the model is tolerable. 26km2 or 9.1% of the catchment is prone to high erosion hazards. In terms of relative comparison of dire and Legedadi catchment the Dire catchment was found to be more endangered by erosion hazards at various intensity. Key Words: USLE model; Soil erosion; Legedadi& Dire catchment | en_US |
| dc.identifier.uri | http://10.90.10.223:4000/handle/123456789/7666 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa Universty | en_US |
| dc.subject | USLE model | en_US |
| dc.subject | Soil erosion | en_US |
| dc.subject | Legedadi& | en_US |
| dc.subject | Dire catchment | en_US |
| dc.title | Soil Erosion Hazard Assessment Using Usle Model: A Case Study of Legedadi & Dire Reservoir Catchment | en_US |
| dc.type | Thesis | en_US |