Next Article in Journal
Hybrid Numerical Scheme of Preissmann Slot Model for Transient Mixed Flows
Previous Article in Journal
Simulating Future Flows and Salinity Intrusion Using Combined One- and Two-Dimensional Hydrodynamic Modelling—The Case of Hau River, Vietnamese Mekong Delta
Open AccessFeature PaperArticle

Evaluating the Effects of Watershed Size on SWAT Calibration

1
Interstate Commission on the Potomac River Basin, Rockville, MD 20850, USA
2
National Soil Erosion Research Laboratory, USDA-Agricultural Research Service, West Lafayette, IN 47907, USA
3
Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN 47907, USA
*
Author to whom correspondence should be addressed.
Water 2018, 10(7), 898; https://doi.org/10.3390/w10070898
Received: 31 May 2018 / Revised: 30 June 2018 / Accepted: 2 July 2018 / Published: 6 July 2018
(This article belongs to the Section Water Quality and Ecosystems)
The Soil and Water Assessment Tool (SWAT) has been calibrated in many watersheds of various sizes and physiographic features. However, it is still unclear whether SWAT calibration parameters will produce satisfactory results if they are implemented in watersheds of different sizes. Evaluating the transferability of SWAT calibration parameters between watersheds of different sizes will provide insight into whether it is acceptable to calibrate SWAT in one watershed and apply the optimized parameters in different size watersheds by assuming both watersheds have similar physiographic properties. This study investigated the influence of watershed size on the SWAT model calibration parameters transferability between four watersheds (CCW = 680 km2, F34 = 183 km2, AXL = 42 km2, and ALG = 20 km2) located in Northeastern Indiana. The results show that calibrating SWAT at one size and applying the optimized parameters at different watershed sizes of similar physiographic features provided satisfactory simulation results. The size watershed at which SWAT was calibrated had little effect on streamflow predictions. Soluble nitrogen loss estimates were improved when calibration was performed at the larger CCW watershed while calibrating SWAT at the smaller AXL and ALG watersheds produced improved statistical indicator values (NSE, R2, and PBIAS) for soluble P and total P when applied to the larger CCW and F34 watersheds. View Full-Text
Keywords: nutrients; optimization; runoff; simulation; Soil and Water Assessment Tool (SWAT); SWAT-CUP; watershed management nutrients; optimization; runoff; simulation; Soil and Water Assessment Tool (SWAT); SWAT-CUP; watershed management
Show Figures

Figure 1

MDPI and ACS Style

Wallace, C.W.; Flanagan, D.C.; Engel, B.A. Evaluating the Effects of Watershed Size on SWAT Calibration. Water 2018, 10, 898.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop