| Title: | Comparison of SWAT and GSSHA for high time resolution prediction of stream flow and sediment concentration in a small agricultural watershed |
| Authors: | Sith, R. and K. Nadoaka |
| Year: | 2017 |
| Journal: | Hydrology |
| Volume (Issue): | 4(2) |
| Pages: | |
| Article ID: | 27 |
| DOI: | 10.3390/hydrology4020027 |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic and pollutant |
| Primary Application Category: | model and/or data comparison |
| Secondary Application Category: | sediment loss and transport |
| Watershed Description: | 12.40 km^2 Todoroki River, located in the southeast part of the Island of Ishigaki in far southern Japan. |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | In this study, two hydrologic models, the Gridded Surface Subsurface Hydrologic Analysis
(GSSHA) and the Soil and Water Assessment Tool (SWAT), were applied to predict stream flow and
suspended sediment concentration (SSC) in a small agricultural watershed in Ishigaki Island, Japan,
in which the typical time scale of flood event was several hours. The performances of these two models
were compared in order to select the right model for the study watershed. Both models were calibrated
and validated against hourly stream flow and SSC for half-month periods of 15 to 31 May 2011 and
17 March to 7 April 2013, respectively. The results showed that both models successfully estimated
hourly stream flow and SSC in a satisfactory way. For the short-term simulations, the GSSHA model
performed slightly better in simulating stream flow as compared to SWAT during both calibration
and validation periods. GSSHA only gave better accuracy when predicting SSC during calibration,
while SWAT performed slightly better during validation. For long-term simulations, both models
yielded comparable results for long-term stream flow and SSC with acceptable agreement. However,
SWAT predicted the overall variation of long-term SSC better than GSSHA. |
| Language: | English |
| Keywords: | agricultural watershed; GSSHA; SWAT; flood event; Ishigaki Island |