| Title: | Effect of watershed subdivision on SWAT flow, sediment, and nutrient predictions |
| Authors: | Jha, M., P.W. Gassman, S. Secchi, R. Gu and J. Arnold |
| Year: | 2004 |
| Journal: | Journal of the American Water Resources Association |
| Volume (Issue): | 40(3) |
| Pages: | 811-825 |
| Article ID: | |
| DOI: | 10.1111/j.1752-1688.2004.tb04460.x |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic and pollutant |
| Primary Application Category: | HRU, subbasin, grid and/or landscape unit delineation effects |
| Secondary Application Category: | pollutant cycling/loss and transport |
| Watershed Description: | Four watersheds (1 or more 8-digit): 1,929, 4,776 (Maquoketa River), 10,829, & 17,941 km^2, located in different parts of Iowa, U.S. |
| Calibration Summary: | |
| Validation Summary: | 1981-90 (Maquoketa River) r2 values: avg. daily = .68 avg. monthly = .76 avg. annual = .65 |
| General Comments: | Variation in subwatershed/HRU configurations had very little effect on SWAT streamflow estimates. However, optimal threshold sizes of 3, 2, & 5% were found for sediment, nitrate, and mineral P, relative to overall watershed sizes across the four watersheds. Further observations are reported for organic N & P, and recommendations are given for criteria on how many subwatersheds to use in a SWAT simulation, depending on what indicators are being estimated with SWAT. |
| Language: | English |
| Keywords: | modeling; flow; sediment; nutrients; watershed subdivision; sensitivity analysis |