SWAT model calibration approaches in an integrated paddy-dominated catchment-command

• DOI: 10.1016/j.agwat.2023.108138
• Publication Date: 2023-01-06T23:13:16Z
• Authors: Sonam Sandeep Dash; Bhabagrahi Sahoo; Narendra Singh Ra...
• Keywords: Pothole (geology); Base flow; Paddy field

The applicability of Soil and Water Assessment Tool (SWAT) for rainfall-runoff modelling in the river-reservoir integrated catchment-command areas is limited due to description paddy-field dynamics. To model dominant hydrology most catchments Asian countries with tropical monsoon type climatology, popular SWAT couples a pothole module place conventional Curve Number (CN) approach. Although few approaches are existing literature, efficacy these modules have not been evaluated catchment-scale applications. Moreover, more conceptual nature many calibration parameters, that could yield erroneous outcomes address issues, was assesses 12,014.70 km2 river catchment-reservoir command iof eastern India. simulation results reveal streamflow generation, revised approach performed best NSE 0.62, followed by CN (NSE=0.60) original (NSE=0.59). water balance analysis resulted small evapotranspiration (ET) values (0.01 mm/day) approach-based simulation. daily prediction uncertainty highest case R-factor estimate 0.73, 0.58 0.56 approach, respectively. Overall, performs better rain fed paddy field, whereas simulates daily-scale irrigated conditions.