Ebrahimi, H. (2011) Performance Evaluation of SWAT Model to Simulation of Runoff and Sediment Yield in Doiraj River Basin in Ilam Province. Masters thesis, University of Zabol.
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Abstract
The importance of water and soil in human life and its role in the formation of communities and development of human civilization is clear and bright anyone. Monitoring and evaluation of the water source should be considered as one of the most important activities that must be done in order to increase awareness and understanding about the country's water resources. Since the phenomenon of erosion and deposition is one of the most complex natural processes and many factors are involved in it, the complete understanding of the effective factors in this phenomenon is really a big problem. This study is done to indicate modeling and estimation of monthly runoff and sediment yeild using SWAT model and optimize the parameters affecting on runoff sediment yeild and Determine the sensitivity and effectiveness of each one of them over production of the monthly runoff and sediment yeild in the Doiraj river basin in the West of Iran, due to lack of data and the importance of simulation of runoff and sediment yeild, due to the Doiraj dam in basin outlet and fertile plains in downstream. This study was done using SWAT a semi-distributed model and SUFI2 algorithm. SWAT model is very practical due to the utilization of many parameters effective flow and sediment yield and the use of GIS. The period 1994 to 2000 for model calibration and the period 1994 to 2000 for model validation was used. The statistical indexes, including R2, bR2 and NS were used for analysis between observed and simulated data. Overall, the results of the first run of model and Evaluation of assessment indicators show that the model performance in first run with the default data is not satisfactory for simulation of runoff and sediment yield in the Doiraj river basin. After model calibration using SUFI2 algorithm, Coefficients R2, bR2 and NS for the calibration of runoff, 0.75, 0.74 and 0.65, for the validation of runoff 0.86, 0.50 and 0.24 were estimated respectively. Also the Coefficients for the calibration of sediment yeild, 0.63, 0.622 and 0.33, for the validation of sediment yeild 0.74, 0.522 and 0.05 were estimated respectively. Also, graphs of the calibration and validation period shows that the time of maximum and minimum runoff and sediment yield is well modeled. Overall, based on the results, performance and capabilities of the SWAT model is evaluated satisfactory for simulation of the monthly runoff and sediment yield in the Doiraj river basin. Based on results of sensitivity analysis four parameters including (SOL_BD), (SOL_AWC), (ALPHA_BNK) and (CN2) were identified as the important parameters which were effective on the output of the runoff from basin that between them, SOL_BD was diagnosed as the most sensitive parameter. Also, four parameters including (CH_N2), (USLE_K), (USLE_P) and (OV_N) were identified as the important parameters effective on the output of the sediment yield from basin that between them, USLE_K was diagnosed as the most sensitive parameter.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | SUFI2 algorithm, runoff, sediment, SWAT model, Doiraj, river |
| Subjects: | S Agriculture > S Agriculture (General) |
| Depositing User: | admin admin1 admin2 |
| Date Deposited: | 06 Nov 2016 05:34 |
| Last Modified: | 06 Nov 2016 05:34 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/958 |
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