Sediment Yield Simulation in Upper Ayeyarwady Basin
This study was undertaken to examine the applicability of Soil and Water Assessment Tool (SWAT) model for the Upper Ayeyarwady Basin for simulating sediment yield. The SWAT model is hydro-dynamic and physically-based model for the application in complex and large basins. The required input data for this study were Digital Elevation Model (DEM) with spatial resolution of 30 m x 30 m, land use/land cover map and soil map. And also the hydro-meteorological data around the basin were used. The model has been calibrated and validated using observed sediment data of eight years at the basin outlet (Sagaing). The automated calibration process was used to calibrate the model parameters using time series data from 2003 to 2007. Data from 2008 to 2010 were used to validate the model using the input parameter set. The model predicted the annual sediment in the watershed as 272.8 million ton per year. The average annual values of sediment yield for Nash-Sutcliffe efficiency (NSE) and R2 were found to be 0.89 and 0.82, respectively for calibration and 0.88 and 0.80, respectively for validation, which were within the allowable limit.
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