Sedimentation Modeling (Case Study, Gololcha Dam Reservoir, Upper Wabe Shebelle River Basin, Ethiopia)
| dc.contributor.advisor | Daniel, Fikreselassie (PhD) | |
| dc.contributor.author | Hussen, Muhammed | |
| dc.date.accessioned | 2020-11-25T08:57:57Z | |
| dc.date.accessioned | 2023-11-11T08:32:27Z | |
| dc.date.available | 2020-11-25T08:57:57Z | |
| dc.date.available | 2023-11-11T08:32:27Z | |
| dc.date.issued | 2020-08 | |
| dc.description.abstract | Sedimentation of reservoirs is a critical problem that jeopardizes service life of hydraulic structures by reducing their active storage capacity. This investigation is intended to estimate sediment yield of Gololcha dam watershed, Wabe shebelle River basin, Ethiopia and to detect the sub basins that are under severe sediment load and developing scenarios as intervention measures in reducing this yield from catchment. The soil and water assessment tool is used in simulating Gololcha watershed having catchment area of 841.463Km . The model calibration and validation for flow and sediment is done through isolating sensitive parameter. Slope length for lateral subsurface flow (SLSOIL) was one of the sensitive parameter for flow and SCS runoff curve number (CN2) for sediment. 2 The model evaluation result showed that determination coefficient of 0.74, Nash-Sutcliffe of 0.73, bias percentage of -9.1 for calibration of flow and determination coefficient of 0.61, Nash-Sutcliffe of 0.6, bias percentage of -2.5 for validation of flow. For sediment calibration and validation, the result obtained with determination coefficient of 0.79, Nash-Sutcliffe of 0.77, bias percentage of 0.7 and determination coefficient of 0.78, Nash-Sutcliffe of 0.52, bias percentage of 10.1, respectively. Thus, the model found to be good in simulating the flow and sediment for the study area. The estimated result indicated that the average annual sediment load at the dam site was 234,768 ton/yr. In this finding Spatial difference of sediment yield for Gololcha watershed disclosed that sub basins 2,3,4,5 and 14 are the critical sub basins generating mean annual sediment load varying from 5.48 ton/ha to 16.22 ton/ha. Different Scenarios developed through land use refinement and operation management for the critical sub basins identified for sediment reduction from the catchment. High amount of sediment reduction observed when intensively cultivated land changed to forest mixed. In addition to this, the combination of contouring and terracing showed more effective management practices than when they are practiced separately. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/23564 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Gololcha watershed | en_US |
| dc.subject | sediment yield | en_US |
| dc.subject | calibration | en_US |
| dc.subject | validation | en_US |
| dc.subject | SWAT | en_US |
| dc.subject | SWAT-CUP | en_US |
| dc.title | Sedimentation Modeling (Case Study, Gololcha Dam Reservoir, Upper Wabe Shebelle River Basin, Ethiopia) | en_US |
| dc.type | Thesis | en_US |