Application of a SWAT model for estimating runoff and sediment in two mountainous basins in central Iran

Application of a SWAT model for estimating runoff and sediment in two mountainous basins in central Iran

The Soil and Water Assessment Tool (SWAT) was used to model runoff and sediment in the Beheshtabad (3860 km 2 ) and Vanak (3198 km 2 ) watersheds in the northern Karun catchment in central Iran. Model calibration and uncertainty analysis were performed with sequential uncertainty fitting (SUFI-2), w...

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Bibliographic Details
Published in:Hydrological sciences journal Vol. 53; no. 5; pp. 977 - 988
Main Authors: ROSTAMIAN, ROKHSARE, JALEH, AAZAM, AFYUNI, MAJID, MOUSAVI, SEYED FARHAD, HEIDARPOUR, MANOUCHEHR, JALALIAN, AHMAD, ABBASPOUR, KARIM C.
Format: Journal Article Conference Proceeding
Language:English
Published: Wallingford Taylor & Francis Group 01-10-2008
IAHS Press
Subjects:
analyse d'incertitude
Earth sciences
Earth, ocean, space
Exact sciences and technology
Freshwater
Hydrology
Hydrology. Hydrogeology
Iran
Marine and continental quaternary
runoff
sediment
SUFI-2
Surficial geology
SWAT-CUP
sédiment
uncertainty analysis
écoulement
Middle East
Iran
Asia
stream transport
models
thickness
runoff
hydrodynamics
digital simulation
drainage basins
sediment transport
discharge
prediction
soil erosion
uncertainties
flow
landform evolution
standard deviation
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Summary:The Soil and Water Assessment Tool (SWAT) was used to model runoff and sediment in the Beheshtabad (3860 km 2 ) and Vanak (3198 km 2 ) watersheds in the northern Karun catchment in central Iran. Model calibration and uncertainty analysis were performed with sequential uncertainty fitting (SUFI-2), which is one of the programs interfaced with SWAT, in the package SWAT-CUP (SWAT Calibration Uncertainty Programs). Two measures were used to assess the goodness of calibration and uncertainty analysis: (a) the percentage of data bracketed by the 95% prediction uncertainty (95PPU) (P factor), and (b) the ratio of average thickness of the 95PPU band to the standard deviation of the corresponding measured variable (D factor). Ideally, the P factor should tend towards 1 with a D factor close to zero. These measures together indicate the strength of the calibration-uncertainty analysis. Runoff and sediment data from four hydrometric stations in each basin were used for calibration and validation. The P factor for Beheshtabad stations ranged from 0.31 to 0.86, while those for Vanak stations were between 0.71 and 0.80. The D factor for Beheshtabad ranged from 0.3 to 1.1, and for Vanak it was 0.77-1.16. These measures indicate a fair model calibration and accounting of uncertainties. The predicted runoff values were quite similar to those for discharge.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0262-6667
2150-3435
DOI:10.1623/hysj.53.5.977