Development and evaluation of a paddy module for improving hydrological simulation in SWAT

Sakaguchi, Atsushi; Eguchi, Sadao; Kato, Tasuku; Kasuya, Masahiro; Ono, Keisuke; Miyata, Akira; Tase, Norio

doi:10.1016/j.agwat.2014.01.009

Cited by 58 publications

(56 citation statements)

References 13 publications

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“…Takeuchi et al [7] developed a cell-based distributed hydro-environmental watershed model for water budget analysis with three-zone cell profiling which consists of a surface water zone with the modified tank model, a surface soil zone with the soil moisture model, and a groundwater zone with the unconfined shallow groundwater model. Soil and Water Assessment Tool (SWAT) was modified and has been applied for simulation in paddy rice fields for the watershed scale [8][9][10]. Jeon et al [11] developed the HSPF-Paddy model to evaluate the effect of water and nutrient loading from paddy rice fields within complex watershed on the river environment by modifying Hydrological Simulation Program-Fortran (HSPF), and evaluated the developed model for the watershed scale as well as the field scale model with high model efficiency.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Water Budget Components in Paddy Rice Field under the Asian Monsoon Climate: Application of HSPF-Paddy Model

Kim

Kim²,

Jeon

2014

Water

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Abstract:The HSPF-Paddy model was applied to the Bochung watershed in Korea to compare water budget components by the land use types under the Asian monsoon climate. The calibration of HSPF-Paddy during 1992-2001 with PEST, a package program to optimize HSPF, and validation during 1985-1991 were carried out. The model efficiencies for monthly stream flow are 0.85 for calibration and 0.84 for validation. The simulation of annual mean runoff met the criteria of water budget analysis with the acceptable error level (less than 10 percent mean error). The simulation of the movement of water from paddy rice field to watershed was successful, and application of HSPF-Paddy coupled with PEST was able to improve accuracy of model simulation with reduced time and efforts for model calibration. The results of water budget analysis show that most of the outflow (86%) for the urban area occurred through surface runoff, showing the highest rate among the land use types compared. Significant amounts of water are irrigated to paddy rice fields, and the runoff depth as well as evapotranspiration from paddy rice field is higher than other land use types. Hydrological characteristic of paddy rice field is that most of water movement occurred at the surface area, resulting from the low infiltration rate and manning's coefficient, as well as ponded water throughout the growing season. Major impact on input and output of water were precipitation and runoff, respectively, influenced by an Asian monsoon climate.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Water Budget Components in Paddy Rice Field under the Asian Monsoon Climate: Application of HSPF-Paddy Model

Kim

Kim²,

Jeon

2014

Water

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“…However, this study has a limitation in terms of model structure. The dynamics of rice paddy field were mimicked like real condition in this study because the current SWAT model could not express rice paddy field as previous studies pointed out (Xie and Cui, 2011;Sakaguchi et al, 2014). Hence the results on a rice paddy field are possible to be underestimated owing to the failure of water management.…”

Section: Discussionmentioning

confidence: 99%

Impact analysis of the decline of agricultural land-use on flood risk and material flux in hilly and mountainous watersheds

et al. 2015

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Abstract. Agricultural land-use has been reduced by mainly urbanization and devastation in Japan. The objective of this study is to evaluate the impact of the decline of agricultural land-use on flood risk and material flux in hilly and mountainous watersheds using Soil Water Assessment Tool. The results indicated that increase of flood risk due to abandonment of agricultural land-use. Furthermore, the abandonment of rice paddy field on steep slope areas may have larger impacts on sediment discharges than cultivated field. Therefore, it is suggested that prevention of expansion of abandonment of rice paddy field is an important factor in the decrease of yields of sediment and nutrients.

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“…The aerodynamic resistance to sensible heat and vapor transfer, r a , is calculated based on wind velocity and surface roughness factors following Williams et al [29]. The amount of evaporation from the water surface when a rice paddy is flooded is calculated using Sakaguchi's equations [27]:…”

Section: Evapotranspirationmentioning

confidence: 99%

“…For paddy simulation, the actual daily evapotranspiration method as suggested by Sakaguchi's [27], is incorporated to represent crop coverage and flood condition. …”

Section: Evapotranspirationmentioning

confidence: 99%

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Simulating the Effects of Agricultural Management on Water Quality Dynamics in Rice Paddies for Sustainable Rice Production—Model Development and Validation

Choi

Jeong

Kim

2017

Water

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Abstract:The Agricultural Policy/Environmental eXtender (APEX) model is widely used for evaluating agricultural conservation efforts and their effects on soil and water. A key component of APEX application in Korea is simulating the water quality impacts of rice paddies because rice agriculture claims the largest cropland area in the country. In this study, a computational module called APEX-Paddy (National Academy of Agricultural Sciences, Wanju, Korea) is developed to simulate water quality with considering pertinent paddy management practices, such as puddling and flood irrigation management. Data collected at two experimental paddy sites in Korea were used to calibrate and validate the model. Results indicate that APEX-Paddy performs well in predicting runoff discharge rate and nitrogen yield while the original APEX highly overestimates runoff rates and nitrogen yields on large storm events. With APEX-Paddy, simulated and observed flow and mineral nitrogen yield (QN) are found to be highly correlated after calibration (Nash & Sutcliffe Efficiency (NSE) = 0.87 and Percent Bias (PBIAS) = −14.6% for flow; NSE = 0.68 and PBIAS = 2.1% for QN). Consequently, the APEX-Paddy showed a greater accuracy in flow and QN prediction than the original APEX modeling practice using the SCS-CN (Soil Conservation Service-Curve Number) method.

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Development and evaluation of a paddy module for improving hydrological simulation in SWAT

Cited by 58 publications

References 13 publications

Characteristics of Water Budget Components in Paddy Rice Field under the Asian Monsoon Climate: Application of HSPF-Paddy Model

Characteristics of Water Budget Components in Paddy Rice Field under the Asian Monsoon Climate: Application of HSPF-Paddy Model

Impact analysis of the decline of agricultural land-use on flood risk and material flux in hilly and mountainous watersheds

Simulating the Effects of Agricultural Management on Water Quality Dynamics in Rice Paddies for Sustainable Rice Production—Model Development and Validation

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