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| dc.contributor.author | Anteneh, Wubet | |
| dc.date.accessioned | 2020-10-30T07:12:14Z | |
| dc.date.available | 2020-10-30T07:12:14Z | |
| dc.date.issued | 2020-10-30 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/11484 | |
| dc.description.abstract | This study was conducted in Kecha watershed, which is one of the sub-watersheds of the Tana basin. There are different soil and water conservation (SWC) structures that are implemented in the watershed in the past years. However, the spatial distribution of the SWC, their current status (grade) and overall effect on the soil erosion of the watershed was not evaluated. Thus, this study was conducted to address this gap with proper methodology and modeling approach. Hence, the detail field survey was conducted and collected SWC structures available in the watershed by GPS and characterizes and graded them based on their efficiency. Besides, other environmental data was collected that affects erosion such as rainfall, soil, topography and land use and cover from primary and secondary sources. Finally, USLE used and estimated the magnitude of soil erosion, identified erosion hotspot area, and evaluated the impact of different SWC structures on soil erosion. Furthermore, we developed different scenarios and tested their efficiency to decrease soil erosion in the watershed. The result indicates that the current mean annual soil loss rate of the watershed is 18.65t/ha/year (which indicate moderate situation) and the total detached and transported amount within the watershed is about 7934 t/year. The erosion area classified into different severity classes and the result revealed that about half of (47%) of the watershed experiences very slight rates of erosion, whereas areas affected by slight, moderate, severe, and very severe rates of soil loss encompass 16%, 13%, 13%, and 11%, respectively. Based on the ground survey result shows that about 32,587 meter SWC structures was constructed in the watershed and among them, very good bunds have a length of 2,197 m (7%), good bunds 19,212 meters (59%), and poor bunds are 11,178 meters (34%). We evaluated the performance and estimation accuracy of the USLE model using ground measured erosion data and the result indicated that there was good agreement between the estimated and measured value (R2 = 0.90). After the model was validated and found reliable, different scenarios (land use and management based) to minimize soil erosion were developed and tested using the model. Accordingly, the first scenario helps to decrease erosion by 47%, scenario 2 by 53%, and scenario 3 by 10%. Therefore, management and SLM practice should be enhanced in the watershed to minimize the existing soil erosion amount and use the land and water resources of the watershed sustainably from generation to generation. Keywords: SDR, Soil loss, USLE Model, Runoff plot and Scenario. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Land Resource Management | en_US |
| dc.title | patial Variability of Soil and Water Conservation Measures and Its Effect on Soil Erosion: The Case of Kecha Watershed, North Western Ethiopia | en_US |
| dc.type | Thesis | en_US |
