SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Hydrosedimentological modeling in a headwater basin in Southeast Brazil 
Authors:Mauri, E.N.E., M.R. Viola, L.D. Norton, P.R. Owens, C.R. de Mello, L.C. Pinto and N. Curi 
Journal:Revista Brasileira de Ciência do Solo 
Volume (Issue):44 
Article ID:e0200047 
URL (non-DOI journals): 
Broad Application Category:hydrologic and pollutant 
Primary Application Category:sediment loss and transport 
Secondary Application Category:calibration, sensitivity, and/or uncertainty analysis 
Watershed Description:6,070 km^2 Mortes River, a tributary of the Upper Grande River located in the State of Minas Gerais in southeast Brazil. 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:Hydrosedimentological modeling is a useful tool to predict the water dynamic in a basin and for water resources management. This study aimed to i) evaluate the ability of Soil and Water Assessment Tool (SWAT) to model sediment load and continuous monthly streamflow in the Mortes River Basin (MRB) in Southeastern Brazil; ii) estimate the sediment yield spatially distributed by sub-basins; iii) estimate the sediment load export to the Funil Hydroelectric Power Plant reservoir (FHPP), located in the MRB outlet. For the sensitivity analysis, calibration, and uncertainty analysis of the model, a semi-automatic calibration in SWAT-CUP version 5.1.6 software with the “Sequential Uncertainty Fitting” algorithm was used. To evaluate the ability of SWAT to reproduce the continuous MRB monthly streamflow and sediment load, statistical indexes, and graphical analyses were used to compare the simulated and observed data. For the sediment evaluation, a spatial and temporal comparison of sediment yield maps was used as well as the sediment yield observed in sub-basins, aiming to identify the areas with a more significant contribution to the sediment generation in the basin. The results demonstrated that SWAT performed satisfactorily in simulating both monthly sediment load and streamflow. For discharge calibration, 99 % of the measured data were bracketed by the 95 % prediction uncertainty (95PPU), and for validation, 97 % of the data were bracketed by the 95PPU, which indicates proper bracketing of the measured data within model prediction uncertainty. Uncertainty analysis indicated that 95PPU could capture 78 % of the sediment loads measured during the calibration and 72 % of the measured data during the validation period at MRB. The hydrologic response unit with pasture and Argissolos (Ultisols), Neossolos Litólicos (Entisols), and Cambissolos (Inceptisols) combined with undulated relief were the main areas responsible for the highest sediment contributions. The sediment load delivered to the reservoir from its filling 2002 to 2015 was estimated in 6,682,704 m3 (16,706,761 Mg) (density of 2.5-Mg m-3) which value corresponded to 2.6 % of storage capacity (water plus sediment) in 14 years. These results are strategic since to become feasible identifying priority areas for soil and water conservation practices as well as useful information for water resources planning and management in the studied basin. 
Keywords:SWAT model, soil erosion, environmental management, sediment delivered