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Modeling of Sediment Yield From Anjeni-Gauged Watershed, Ethiopia Using SWAT Model
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Hydraulic Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Hydraulic Engineering.
2010 (English)In: Journal of the American Water Resources Association, ISSN 1093-474X, E-ISSN 1752-1688, Vol. 46, no 3, 514-526 p.Article in journal (Refereed) Published
Abstract [en]

The Soil and Water Assessment Tool (SWAT) was tested for prediction of sediment yield in Anjeni-gauged watershed, Ethiopia. Soil erosion and land degradation is a major problem on the Ethiopian highlands. The objectives of this study were to evaluate the performance and applicability of SWAT model in predicting monthly sediment yield and assess the impacts of subbasin delineation and slope discretization on the prediction of sediment yield. Ten years monthly meteorological, flow and sediment data were used for model calibration and validation. The annual average measured sediment yield was 24.6 tonnes/ha. The annual average simulated sediment yield was 27.8 and 29.5 tones/ha for calibration and validation periods, respectively. The study found that the observed values showed good agreement with the simulated sediment yield with Nash-Sutcliffe efficiency (NSE) = 0.81, percent bias (PBIAS) = 28%, RMSE-observations standard deviation ratio (RSR) = 0.23, and coefficient of determination (R superset of) = 0.86 for calibration and NSE = 0.79, PBIAS = 30%, RSR = 0.29, and R superset of = 0.84 for validation periods. The model can be used for further analysis of different management scenarios that could help different stakeholders to plan and implement appropriate soil and water conservation strategies.

Place, publisher, year, edition, pages
2010. Vol. 46, no 3, 514-526 p.
Keyword [en]
SWAT, SUFI-2, sediment yield, soil erosion, watershed modeling, Anjeni, hydrology, streamflows
National Category
Oceanography, Hydrology, Water Resources
Identifiers
URN: urn:nbn:se:kth:diva-12021DOI: 10.1111/j.1752-1688.2010.00431.xISI: 000278522700006Scopus ID: 2-s2.0-77954615297OAI: oai:DiVA.org:kth-12021DiVA: diva2:294407
Note
QC 20100719 Uppdaterad från in press till published (20101123).Available from: 2010-02-17 Created: 2010-02-17 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Modelling Hydrological and Hydrodynamic Processes in Lake Tana Basin, Ethiopia
Open this publication in new window or tab >>Modelling Hydrological and Hydrodynamic Processes in Lake Tana Basin, Ethiopia
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lake Tana Basin is of significant importance to Ethiopia concerning water resources aspects and the ecological balance of the area. The growing high demands in utilizing the high potentials of water resource of the Lake to its maximal limit, pictures a disturbing future for the Lake. The objective of this study was to assess the influence of topography, soil, land use and climatic varia-bility on the hydrological and hydrodynamic processes of the Lake Tana Basin. The physically based SWAT model was successfully calibrated and validated for flow and sediment yield. Se-quential uncertainty fitting (SUFI-2), parameter solution (ParaSol) and generalized likelihood un-certainty estimation (GLUE) calibration and uncertainty analysis methods were compared and used for the set-up of the SWAT model. There is a good agreement between the measured and simulated flows and sediment yields. SWAT and GIS based decision support system that uses multi-criteria evaluation (MCE) was used to identify the most vulnerable areas to soil erosion in the basin. The results indicated that 12 to 30.5% of the watershed is high erosion potential. Pro-jected changes in precipitation and temperature in the basin for two seasons were analyzed using outputs from fifteen global climate models (GCMs). A historical-modification procedure was used to downscale large scale outputs from GCM models to watershed-scale climate data. The results showed significant changes in streamflow and other hydrological parameters in the period between 2045-2100. SWAT was combined with a three dimensional hydrodynamic model, GEMSS to investigate the flow structure, stratification, the flushing time, lake water balance and finally the Lake‘s water level response to planned water removal. We have found an alarming and dramatic fall of the water levels in Lake Tana as response to the planned water withdrawal. The combination of the two models can be used as a decision support tools to better understand and manage land and water resources in watersheds and waterbodies. The study showed that the Lake Tana Basin may experience a negative change in water balance in the forthcoming decades due to climate change as well as over abstraction of water resources.

Place, publisher, year, edition, pages
Stockholm: KTH, 2010. viii, 66 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1057
Keyword
Lake Tana, Climate Change, SWAT, Hydrological Modeling, Hydrodynamic, GEMSS, MCE, Streamflow, Sediment yield
National Category
Oceanography, Hydrology, Water Resources Water Engineering
Identifiers
urn:nbn:se:kth:diva-12024 (URN)978-91-7415-558-7 (ISBN)
Public defence
2010-03-05, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20100720Available from: 2010-02-17 Created: 2010-02-17 Last updated: 2011-05-24Bibliographically approved

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