| Title: | Development of SWAT-Paddy for Simulating Lowland Paddy Fields |
| Authors: | Tsuchiya, R., T. Kato, J. Jeong and J.G. Arnold |
| Year: | 2018 |
| Journal: | Sustainability |
| Volume (Issue): | 10(9) |
| Pages: | |
| Article ID: | 3246 |
| DOI: | doi:10.3390/su10093246 |
| URL (non-DOI journals): | |
| Model: | SWAT-Paddy |
| Broad Application Category: | hydrologic only |
| Primary Application Category: | data and/or component contribution to SWAT or SWAT+ |
| Secondary Application Category: | rice paddy dynamics and/or production |
| Watershed Description: | 117 km^2 Upper Kashima River, which is located in the Imbanuma Lake drainage area, Chiba Prefecture, in the central region of Japan |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | The recent increase in global consumption of rice has led to increased demand for
sustainable water management in paddy cultivation. In this study, we propose an enhanced paddy
simulation module to be introduced to Soil and Water Assessment Tool (SWAT) to evaluate the
sustainability of paddy cultivation. The enhancements added to SWAT include: (1) modification of
water balance calculation for impounded fields, (2) addition of an irrigation management option
for paddy fields that are characterized by flood irrigation with target water depth, and (3) addition
of a puddling operation that influences the water quality and infiltration rate of the top soil layer.
In a case study, the enhanced model, entitled SWAT-Paddy, was applied to an agricultural watershed
in Japan. The results showed that the SWAT-Paddy successfully represented paddy cultivation,
water management, and discharge processes. Simulated daily discharge rates with SWAT-Paddy
(R2 = 0.8) were superior to the SWAT result (R2 = 0.002). SWAT-Paddy allows the simulation of
paddy management processes realistically, and thus can enhance model accuracy in paddy-dominant
agricultural watersheds. |
| Language: | English |
| Keywords: | |