Dynamic Modeling for the Investigation of Changes in Land Uses on Streamflow in the Upper Tha Chin Watershed

Authors

  • Banchongsak Faksomboon
  • Surat Bualert
  • Narouchit Dampin
  • Nipon Thangtham

Abstract

The objective of this study was to apply a dynamic modeling for the investigation of changes in land uses on streamflow in the Upper Tha Chin Watershed (UTCW). The Soil and Water Assessment Tool (SWAT) model was applied in order to estimate the amount of the streamflow from land utilization from January 2013 to December 2014 as presented (Scenario 1). The reliability of the model was calibrated with the observed data from two hydrologic stations by adjusting the coefficient of the key parameters by using SWAT CUP program. The goodness of the calibration results were assessed based on the coefficient of determination (R2), Nash-Sutcliffe efficiency coefficient (NSE) and mean squared error (MSE) along with simulating the impact of land utilization in the year 2020 (Scenario 2). The results obtained from the SWAT model showed that the UTCW area was 5,253.96 km2 with a stream length of 1,906 km, 14 sub-watersheds and 286 hydrological response units (HRUs). The Scenario 1 indicated that the streamflow of the UTCW was 374.74 Mm3/year. The simulation of Scenario 2, forecasting the expected land use change in year 2020, showed that the amount of the streamflow decreased to 65.09 Mm3/year, when compared with Scenario 1, because of decreasing in forest-deciduous and increasing in field crops. Keywords :  dynamic modeling, land use, streamflow, Upper Tha Chin Watershed

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Published

2017-05-11