Water management practices and SCS curve numbers of paddy fields equipped with surface drainage pipes

Jung, Jinyoung; Yoon, Kwang‐Sik; Choi, Dong-Jin; Lim, Sang-Sun; Choi, Woo‐Jung; Choi, Soo-Myung; Lim, Byung-Jin

doi:10.1016/j.agwat.2012.03.014

Cited by 31 publications

(20 citation statements)

References 45 publications

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“…In other climatic zones such as Mediterranean (Krupa et al 2011) and subtropical regions (Wang et al 2014), where effective rainfall is low due either to limited rainfall or high rates of evapotranspiration, irrigation can be an important driver of nutrient loss due to intermittent forced drainage and improper management of drainage facilities (Jung et al 2012). For example, in subtropical south China, Xiong et al (2015) reported that drainage water volume was reduced in proportion to the reduction of irrigation water volume.…”

Section: Calculations and Statistical Analysesmentioning

confidence: 98%

“…Flow velocities in the irrigation and drainage canals were measured using a flow velocity meter (C2, OTT, Germany), and flow rates were calculated using the midsection method (Herschy 2009). Because there was no backwater or damming at the discharge canals, the measured water levels were converted to flow rates using the water level flow rate relationship derived from the measured data (Jung et al 2012; Petrucci and Bonhomme 2014).…”

Section: Hydrological Monitoringmentioning

confidence: 99%

“…3). Therefore, it could be assumed that nutrient loss via surface runoff or drainage in dry seasons is marginal (Jung et al 2012).…”

Section: Calculations and Statistical Analysesmentioning

confidence: 99%

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Further Understanding of the Impacts of Rainfall and Agricultural Management Practices on Nutrient Loss from Rice Paddies in a Monsoon Area

Jung

Lim

Kwak

et al. 2015

Water Air Soil Pollut

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As rice paddies are widespread sources of water pollution in the agricultural regions of the Asian monsoon area, a mechanistic understanding of nutrient loss from paddies is critical for water quality management. A 2-year experiment was conducted in a typical monsoon-affected rice field to improve our understanding of the impacts of rainfall and agricultural management practice on nitrogen (N) and phosphorus (P) loss. Samples of paddy drainage water were collected during rainfall events (n=25) and analyzed for total N (T-N) and total P (T-P) concentrations. The impacts of rainfall (amount, duration, and intensity) and agricultural management practice (transplanting and fertilization) on the event mean concentration (EMC) and loss of nutrient were assessed using regression analyses. The results showed that T-N and T-P concentrations were affected by agricultural practice; meanwhile, loss of T-N and T-P was correlated with rainfall characteristics. Specifically, the EMC of T-N but T-P was negatively (p<0.001) correlated with the number of days after agricultural practice in both years, which likely represents a decrease in nutrient availability in paddy water over time. Loss of T-N and T-P was positively (p<0.01) correlated with rainfall amount, and this suggests that the rainfall-runoff process is a key driver of nutrient loss in the study area. Our results suggest that rainfall amount and days after transplanting need to be taken into account when estimating nutrient loss from rice paddies in monsoon regions.

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Section: Calculations and Statistical Analysesmentioning

confidence: 98%

Section: Hydrological Monitoringmentioning

confidence: 99%

See 1 more Smart Citation

Further Understanding of the Impacts of Rainfall and Agricultural Management Practices on Nutrient Loss from Rice Paddies in a Monsoon Area

Jung

Lim

Kwak

et al. 2015

Water Air Soil Pollut

Self Cite

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“…A detailed description of the model and its input/output variables can be found in the model's public domain website at http://www.brc.tamus.edu/swat. SWAT processes hydrological simulation by applying the principle of water balance in each of the hydrologic response units (HRUs) [38], which define areas with identical combinations of surface slope, land use, and soil type [18]. The water balance equation is given as…”

Section: Swat Modelmentioning

confidence: 99%

Separation of the Climatic and Land Cover Impacts on the Flow Regime Changes in Two Watersheds of Northeastern Tibetan Plateau

Yang

Feng

Yin

et al. 2017

Advances in Meteorology

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Assessment of the effects of climate change and land use/cover change (LUCC) on the flow regimes in watershed regions is a fundamental research need in terms of the sustainable water resources management and ecosocial developments. In this study, a statistical and modeling integrated method utilizing the Soil and Water Assessment Tool (SWAT) has been adopted in two watersheds of northeastern Tibetan Plateau to separate the individual impacts of climate and LUCC on the flow regime metrics. The integrated effects of both LUCC and climate change have led to an increase in the annual streamflow in the Yingluoxia catchment (YLC) region and a decline in the Minxian catchment (MXC) region by 3.2% and 4.3% of their total streamflow, respectively. Climate change has shown an increase in streamflow in YLC and a decline in MXC region, occupying 107.3% and 93.75% of the total streamflow changes, respectively, a reflection of climatic latitude effect on streamflow. It is thus construed that the climatic factors contribute to more significant influence than LUCC on the magnitude, variability, duration, and component of the flow regimes, implying that the climate certainly dominates the flow regime changes in northeastern Tibetan Plateau.

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“…The first is the curve number (CN) approach (Im et al 2007;Jung et al 2012) which applies the Soil Conservation Service (SCS) CN procedure developed by the National Resources Conservation Service (NRCS 2004) to calculate the rainfall-runoff response in paddy field hydrological response units (HRUs). In SWAT, HRUs are defined as the areas, each of which consists of homogeneous land use with homogeneous land management and soil characteristics, located in a subwatershed.…”

Section: Introductionmentioning

confidence: 99%

Examination of the water balance of irrigated paddy fields in SWAT 2009 using the curve number procedure and the pothole module

Sakaguchi

Eguchi

Kasuya³

2014

Soil Science and Plant Nutrition

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The Soil and Water Assessment Tool (SWAT), a basin-scale hydrological and water quality simulation model, has become popular in Asia for assessing the impacts of land use and human activities including paddy rice (Oryza sativa L.) cultivation which is a typical agricultural management system in Asia. The water ponding and drainage management in paddy fields should significantly affect the regional hydrology and water quality; however, the suitability of SWAT for simulating paddy hydrology at a field scale has not been thoroughly examined.In this study, the water balance of irrigated paddy fields in SWAT was examined for a small watershed where actual daily irrigation data were available. Two approaches available in SWAT to calculate hydrology in a watershed containing paddy fields, the curve number procedure and the pothole module, were applied with the regional paddy rice management standard.The water balance components estimated using the pothole module were significantly different from the actual hydrology in paddy fields. The estimated percolation of water was zero on most days even under ponded water conditions. Any of the percolation, surface runoff and evapotranspiration (ET) was estimated to be zero during the drainage period. The estimated ET was too small on a number of days during the ponding period. As a result, the watershed-scale Nash-Sutcliffe model efficiency (NSE) for the daily river flow rate at the outlet of the watershed was less than zero, indicating low model efficiency. On the contrary, no significant problems were apparently found in the estimated water balance components in paddy fields using the curve number procedure, yielding a higher NSE value of 0.58 at the watershed scale. However, the curve number procedure that in principle cannot simulate the ponded water conditions is obviously impossible to use to reflect the various paddy water management scenarios in the field.In conclusion, neither of these two approaches is suitable for simulating paddy field hydrology, indicating the need for the development of a paddy module in SWAT.

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Water management practices and SCS curve numbers of paddy fields equipped with surface drainage pipes

Cited by 31 publications

References 45 publications

Further Understanding of the Impacts of Rainfall and Agricultural Management Practices on Nutrient Loss from Rice Paddies in a Monsoon Area

Further Understanding of the Impacts of Rainfall and Agricultural Management Practices on Nutrient Loss from Rice Paddies in a Monsoon Area

Separation of the Climatic and Land Cover Impacts on the Flow Regime Changes in Two Watersheds of Northeastern Tibetan Plateau

Examination of the water balance of irrigated paddy fields in SWAT 2009 using the curve number procedure and the pothole module

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