Runoff and Sediment Yield Simulation in the Weyib Watershed, Genale-dawa Basin, Ethiopia
| dc.contributor.advisor | Teferi PhD, Ermias | |
| dc.contributor.author | Getinet, Abraham | |
| dc.date.accessioned | 2021-04-16T06:27:44Z | |
| dc.date.accessioned | 2023-11-18T08:41:59Z | |
| dc.date.available | 2021-04-16T06:27:44Z | |
| dc.date.available | 2023-11-18T08:41:59Z | |
| dc.date.issued | 2021-03 | |
| dc.description.abstract | The SWAT model was applied to simulate the runoff and sediment yield from the Weyib watershed. This watershed has an area of 24369.6 km2 and located in South-Eastern part of Ethiopia, sharing two regional states, Oromia and Somali. The objective of this study was to estimate soil loss rate in the study watershed and to identify appropriate intervention measures to control erosion. In spite of the serious erosion problems in the study watershed, so far only few studies related to erosion are available. Consequently, this study was conducted with the aim of contributing to the exiting insufficient quantitative information on soil erosion problems. Due to the absence of measurements for some of the stations, about 25 years meteorological data and 21 years flow and sediment data generated by regional equations were used for the analysis. On the other hand, the SUFI2 program in the SWAT-CUP was applied for model calibration and validation using time series data from 1992-2012. The model prediction efficiency was evaluated using statistical model performance indicators like, coefficient of determination (R2 ) and NashSutcliffe model Efficiency (ENS) and the result showed that both surface runoff and sediment yield were estimated satisfactorily, with an R 2 and NSE values of greater than 0.67 each, both for calibration (1994–2004) and validation (2005-2012) periods. The model prediction for the average annual precipitation and run-off was 1029.2mm and 311.30mm, respectively; whereas, the model prediction for the average annual total sediment load was 1.23t/ha. The annual soil loss estimated by the model for the Weyib watershed during the simulation period 1992-2012 ranges from 12.49 ha−1 year−1 to 88.36 ha−1 year−1 , with an average value of 37.33 tons ha−1 year−1 . In this study, Subwatershed 6, 7, 8, 10 and 12 were found to have the maximum annual sediment load, having an annual sediment load of greater than 20 tons/ha/yr, sub-watershed 8 being the most erodible area, and as these sub-watersheds were most sensitive to erosion, they were labeled as erosion hotspot areas. Different intervention scenarios were developed for erosion control and proper management of the watershed. Simulation results for these scenarios reflected that, 35-78% sediment yield reduction could be achieved by implementing filter strips, stone bunds, contour farming, fanya juu, bench terraces and from the combination of these. On the other hand, conversion of agricultural lands to forest areas reflected a 10-45% sediment yield reduction. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/26141 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | SWAT Sediment yield, Runoff, Soil Erosion, Weyib watershed | en_US |
| dc.title | Runoff and Sediment Yield Simulation in the Weyib Watershed, Genale-dawa Basin, Ethiopia | en_US |
| dc.type | Thesis | en_US |