Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Development of SWAT-PADDY for Simulating Lowland Paddy Fields

Version 1 : Received: 3 November 2016 / Approved: 3 November 2016 / Online: 3 November 2016 (09:42:16 CET)
Version 2 : Received: 21 August 2018 / Approved: 21 August 2018 / Online: 21 August 2018 (11:05:43 CEST)
Version 3 : Received: 13 September 2018 / Approved: 13 September 2018 / Online: 13 September 2018 (08:42:30 CEST)

A peer-reviewed article of this Preprint also exists.

Tsuchiya, R.; Kato, T.; Jeong, J.; Arnold, J.G. Development of SWAT-Paddy for Simulating Lowland Paddy Fields. Sustainability 2018, 10, 3246. Tsuchiya, R.; Kato, T.; Jeong, J.; Arnold, J.G. Development of SWAT-Paddy for Simulating Lowland Paddy Fields. Sustainability 2018, 10, 3246.

Abstract

The consumption of rice, which recently increases globally, leads to requirement for planning sustainable water management for paddy cultivation. In this research, SWAT model was modified to evaluate sustainability of paddy cultivation. Modifications to simulate paddy cultivation are 1) to equip with a new water balance model of impounded fields, 2) to add an irrigation management option for paddy fields, which is characterized by flood irrigation managed by farmers on a daily basis, 3) to consider puddling operation that influences water quality and infiltration rate of soil. The enhanced model, named SWAT-PADDY, was applied to an agricultural watershed in Japan as a case study. The modified model succeeded in representing paddy cultivation in the study area. However, SWAT-PADDY underestimated base flow in irrigation period. The cause of this is inferred that the modified model doesn’t represent return flow of excess withdrawal of river water. In conclusion, addition of the models of impoundment and management practices in paddy fields to SWAT improved field scale simulation of water balance and irrigation in paddy fields. However, further improvement of the model on irrigation return flow process is needed to better predict hydrology of watersheds dominated by paddy irrigation.

Keywords

SWAT; model development; paddy fields; irrigation; return flow

Subject

Environmental and Earth Sciences, Environmental Science

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