Development of SWAT-Paddy for Simulating Lowland Paddy Fields

Tsuchiya, Ryota; Kato, Tasuku; Jeong, Jaehak; Arnold, Jeffrey G.

doi:10.3390/su10093246

Cited by 22 publications

(31 citation statements)

References 29 publications

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“…The representation of water processes in paddy field of SWAT+ seems not superior to that in SWAT. The appropriate representation of paddy field should be further investigated [19][20][21][22].…”

Section: Resultsmentioning

confidence: 99%

Comparison between SWAT and SWAT+ for simulating streamflow in a paddy-field-dominated basin, northeast Thailand

Kakarndee

Kositsakulchai

2020

E3S Web Conf.

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The performance of the well-known Soil and Water Assessment Tool (SWAT) and the new SWAT+ for streamflow simulation in a paddy- field-dominated basin was compared. The Lam Sioa River Basin, northeast Thailand (drainage area of 3,394 km2) was selected. The data inputs consisted of DEM, land use, soil, and climate (rainfall, temperature, sunshine hour, wind speed and humidity). The model parameters used the default values from SWAT database and daily simulation was conducted from 2005 to 2017. The division of sub-basins into “landscape units” is one of new features of SWAT+. The total number of HRUs defined from SWAT+ were higher than those from SWAT because the sub-basins derived from SWAT+ contained two landscape units (floodplain and upslope). With the default model parameters, the model performance indicators were found below the satisfactory rating. Both models simulated relatively high streamflow at the beginning of rainy season, while the observed streamflow was still not occurred. In paddy field, rainfall excess become ponding water, not surface runoff. The appropriate representation of paddy field in SWAT model should be further investigated.

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Section: Resultsmentioning

confidence: 99%

Comparison between SWAT and SWAT+ for simulating streamflow in a paddy-field-dominated basin, northeast Thailand

Kakarndee

Kositsakulchai

2020

E3S Web Conf.

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“…Because surface water and pumped groundwater are used for large-scale irrigation, the increase in the area of paddy fields may have greatly changed the hydrologic cycle in the Sanjiang Plain. Therefore, the demanded irrigation of paddy fields should be accurately simulated, which is completed in MODCYCLE using a method similar to that of Tsuchiya [70]. We collected the annual irrigation amount entering paddy fields from eight experimental irrigation stations in the Sanjiang Low Plain from 2008 to 2012.…”

Section: Model Calibration and Validationmentioning

confidence: 99%

Study on Hydrologic Effects of Land Use Change Using a Distributed Hydrologic Model in the Dynamic Land Use Mode

Sun

Guo

et al. 2021

Water

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It is reasonable to simulate the hydrologic cycle in regions with drastic land use change using a distributed hydrologic model in the dynamic land use mode (dynamic mode). A new dynamic mode is introduced into an object-oriented modularized model for basin-scale water cycle simulation (MODCYCLE), a distributed hydrologic model based on sub-watersheds, and the hydrological response unit (HRU). The new mode can linearly interpolate data for the years without land use data and consistently transfer HRU water storage between two adjacent years after a land use data update. The hydrologic cycle simulation of the Sanjiang Plain in China was carried out from 2000 to 2014 in the dynamic mode using land use maps of 2000, 2005, 2010, and 2014. Through calibration and validation, the performance of the model reached a satisfactory level. Replacing the land use data of the calibrated model using that of the year 2000, a comparison model in the static land use mode (static mode) was built (i.e., land use unchanged since 2000). The hydrologic effects of land use change were analyzed using the two models. If the land use pattern remained unchanged from 2000, despite the average annual runoff increasing by 4% and the average annual evapotranspiration decreasing by 4% in this region only, the groundwater storage of the plain areas in 2014 would increase by 4.6 bil. m3 compared to that in 2000, rather than the actual decrease of 4.7 bil. m3. The results show that the fluxes associated with groundwater are obviously more disturbed by land use change in the Sanjiang Plain. This study suggests that the dynamic mode should be used to simulate the hydrologic cycle in regions with drastic land use change, and the consistent transfer of HRU water storage may be considered in the dynamic mode.

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“…However, the majority of these studies report no or only limited details of how rice production was accounted for in SWAT. Furthermore, several studies strongly suggest that typical simulation methods used in SWAT do not adequately represent the characteristics of hydrological processes and pollutant transport that occur in rice paddy systems, including conditions where it appears that the overall watershed hydrology appears to be reasonably well simulated [15,[58][59][60][61][62][63][64] .…”

Section: Introduction mentioning

confidence: 99%

“…The ability to account for differences in cultural practices, water dynamics, and pollutant cycling/transport between major types of rice production systems is an important attribute of such an enhanced SWAT rice paddy module. It is envisioned here that the development of this module would build on the foundation of existing key studies [58][59][60][61][62][63][64] and recent modifications made to the Agricultural Policy/Environmental eXtender (APEX) ecohydrological model [38,65,66] , resulting in the APEX-Paddy model that supports enhanced simulation of rice paddy conditions [67] . Thus, the specific objectives of this study are to provide: 1) an overview of major rice production systems used in Asia and other regions; 2) a review of typical applications of SWAT that incorporate rice production including inherent weaknesses in standard simulation approaches; 3) a description of key modifications performed in recent SWAT applications that have resulted in more realistic representation of rice paddy systems; 4) a summary of the improvements and results that have been obtained with APEX-Paddy; 5) a conceptual structure for the proposed SWAT rice paddy module.…”

Section: Introduction mentioning

confidence: 99%

Simulation of rice paddy systems in SWAT: A review of previous applications and proposed SWAT+ rice paddy module

Gassman

Jeong

Boulangé

et al. 2022

International Journal of Agricultural and Biological Engineering

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The Soil and Water Assessment Tool (SWAT) is an ecohydrological watershed-scale model which was initially developed in the early 1990s to simulate the impacts of land use, management systems, and climate on hydrology and/or water quality. First adopted in the U.S., the use of the model then spread to Europe and then later to Asia and other regions. The range of applications that SWAT has been applied to have also expanded dramatically, which influenced ongoing model development which has been virtually continuous over the past two decades. A key component of many SWAT applications in Asia is accounting for rice paddy production that is common in some subregions within the continent. However, most of these studies do not provide explicit details of how rice production was simulated in SWAT. Other research has revealed that significant problems occur when trying to represent rice paddy systems in standard versions of SWAT, due to limitations in algorithms based on the runoff curve number approach or the pothole option. In response, key modifications have been made to SWAT in recent studies that have resulted in a more accurate representation of rice paddy systems. These developments point to the need for the incorporation of an enhanced rice paddy module within SWAT to better capture rice paddy hydrological and pollutant dynamics, which would support improved use of the model in Asia and other rice production regions. Subtopics related to simulating rice production in SWAT are discussed as follows: 1) an overview of global rice production; 2) history of SWAT development; 3) typical approaches for simulating rice production; 4) problems associated with the typical approaches; 5) recent code modifications to address deficiencies in replicating rice paddy systems; 6) recommendations for developing a standard rice paddy module for future SWAT codes.

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Development of SWAT-Paddy for Simulating Lowland Paddy Fields

Cited by 22 publications

References 29 publications

Comparison between SWAT and SWAT+ for simulating streamflow in a paddy-field-dominated basin, northeast Thailand

Comparison between SWAT and SWAT+ for simulating streamflow in a paddy-field-dominated basin, northeast Thailand

Study on Hydrologic Effects of Land Use Change Using a Distributed Hydrologic Model in the Dynamic Land Use Mode

Simulation of rice paddy systems in SWAT: A review of previous applications and proposed SWAT+ rice paddy module

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