Spatio-temporal modeling of surface runoff in ungauged sub-catchments of Subarnarekha river basin using SWAT

Authors

  • CHINMAYA PANDA
  • DWARIKA MOHAN DAS
  • B. C. SAHOO
  • B. PANIGRAHI
  • K. K. SINGH

DOI:

https://doi.org/10.54302/mausam.v72i3.1309

Keywords:

SWAT, SUFI-2, Streamflow, Surface runoff, Calibration, Validation

Abstract

In this present study, Soil and Water Assessment Tool (SWAT) embedded with ArcGIS interface has been used to simulate the surface runoff from the un-gauged sub-catchments in the upper catchment of Subarnarekha basin. Model calibration and validation were performed with the help of Sequential Uncertainty Fitting (SUFI-2) in-built in the SWAT-CUP package (SWAT Calibration Uncertainty Programs). The model was calibrated for a period from 1996 to 2008 with 3 years warm up period (1996-1998) and validated for a period of 5 years from 2009 to 2013. The model evaluation was performed by Nash - Sutcliffe coefficient (NSE), Coefficient of determination (R2) and Percentage Bias (PBIAS). The degree of uncertainty was evaluated by P and R factors. Basing upon the R2, NSE and PBIAS values respectively, of the order of 0.90, 0.90 and -12%, during calibration and 0.85, 0.83 and -15% during validation, substantiate performance of the model. All uncertainties of model parameters have been well taken by the P and R factors respectively, of the order of 0.95 and 0.77 during calibration and 0.82 and 0.87 during validation. The runoff generation from 19 sub-catchments of Adityapur catchment varies from 29.2-44.1% of the annual rainfall and average surface runoff simulated for the entire catchment is 545 mm. As the surface runoff generated in most of the sub-catchments amounts to above 30% of rainfall, it is recommended for adequate number of structural interventions at appropriate locations in the catchment to store the rainfall excess for providing irrigation, recharging groundwater and restricting the sediment and nutrient loss.

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Published

27-10-2021

How to Cite

[1]
C. . PANDA, D. M. . DAS, B. C. . SAHOO, B. . PANIGRAHI, and K. K. . SINGH, “Spatio-temporal modeling of surface runoff in ungauged sub-catchments of Subarnarekha river basin using SWAT”, MAUSAM, vol. 72, no. 3, pp. 597–606, Oct. 2021.

Issue

Section

Research Papers

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