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

Sakaguchi, Atsushi; Eguchi, Sadao; Kasuya, Masahiro

doi:10.1080/00380768.2014.919834

Cited by 24 publications

(25 citation statements)

References 22 publications

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“…A decrease in ET is normally caused by a decrease in P and/or PET (Sun et al, 2005;Sun et al, 2011aSun et al, , 2011b. Our data suggested that the decrease in ET was not caused by PET or P because annual and growing-season PET significantly increased and overall precipitation did not change significantly.…”

Section: Increased Stream Flow Explained By the Decreases In Et And Laimentioning

confidence: 54%

“…Second, regional annual ET is generally controlled by PET, P , and land surface conditions (Sun et al, 2005). A decrease in ET is normally caused by a decrease in P and/or PET (Sun et al, 2005;Sun et al, 2011aSun et al, , 2011b.…”

Section: Increased Stream Flow Explained By the Decreases In Et And Laimentioning

confidence: 99%

“…Empirical data are still lacking information about changes in water balances and watershed hydrologic characteristics other than storm flow, such as total flow, low flow, and evapotranspiration (ET) (Dow and DeWalle, 2000;Boggs and Sun, 2011) in different physiographic settings (Barron et al, 2013). Previous studies rely heavily on simulation models (Kang et al, 1998;Kim et al, 2005Kim et al, , 2014Sakaguchi et al, 2014). Controversies on the magnitude and underlying mechanisms of hydrologic responses to land conversion during urbanization remain in literature He et al, 2009;Sun and Lockaby, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Urbanization dramatically altered the water balances of a paddy field-dominated basin in southern China

Hao

Sun

Liu

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. Rice paddy fields provide important ecosystem services (e.g., food production, water retention, carbon sequestration) to a large population globally. However, these benefits are diminishing as a result of rapid environmental and socioeconomic transformations, characterized by population growth, urbanization, and climate change in many Asian countries. This case study examined the responses of stream flow and watershed water balances to the decline of rice paddy fields due to urbanization in the Qinhuai River basin in southern China, where massive industrialization has occurred during the past 3 decades. We found that stream flow increased by 58 % and evapotranspiration (ET) decreased by 23 % during 1986-2013 as a result of a threefold increase in urban areas and a reduction of rice paddy fields by 27 %. Both high flows and low flows increased significantly by about 28 % from 2002 to 2013. The increases in stream flow were consistent with the decreases in ET and leaf area index monitored by independent remote sensing MODIS (Moderate Resolution Imaging Spectroradiometer) data. Attribution analysis, based on two empirical models, indicated that land-use/land-cover change contributed about 82-108 % of the observed increase in stream flow from 353 ± 287 mm yr −1 during 1986-2002 to 556 ± 145 during [2003][2004][2005][2006][2007][2008][2009][2010][2011][2012][2013]. We concluded that the reduction in ET was largely attributed to the conversion of cropland to urban use. The effects of land-use change overwhelmed the effects of regional climate warming and climate variability. Converting traditional rice paddy fields to urban use dramatically altered land surface conditions from an artificial wetlanddominated landscape to an urban land-use-dominated one, and thus was considered an extreme type of contemporary hydrologic disturbance. The ongoing large-scale urbanization of the rice paddy-dominated regions, in humid southern China and East Asia, will likely elevate storm-flow volume, aggravate flood risks, and intensify urban heat island effects. Understanding the connection between land-use/land-cover change and changes in hydrological processes is essential for better management of urbanizing watersheds in the rice paddy-dominated landscape.

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Section: Increased Stream Flow Explained By the Decreases In Et And Laimentioning

confidence: 54%

Section: Increased Stream Flow Explained By the Decreases In Et And Laimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Urbanization dramatically altered the water balances of a paddy field-dominated basin in southern China

Hao

Sun

Liu

et al. 2015

Hydrol. Earth Syst. Sci.

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“…However, improvement of the SWAT modelling in tropical regions is needed as it was initially constructed based on the climate and environmental conditions in the United States. For example, in recent years, some studies have been conducted to improve the paddy module within the SWAT model [39,40]. As oil palm plantation is a major crop in tropical countries including Malaysia, Indonesia, and some African countries, so modification of the oil palm module might be able to increase the reliability of the SWAT model in the tropical regions.…”

Section: Discussionmentioning

confidence: 99%

Hydro-Meteorological Assessment of Three GPM Satellite Precipitation Products in the Kelantan River Basin, Malaysia

et al. 2018

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Abstract:The rapid development of Satellite Precipitation Products (SPPs) has heightened the need for a hydro-meteorological assessment of the Integrated Multi-satellite Retrievals for Global Precipitation Measurement (IMERG) products in different climate and geographical regions. Reliability of the IMERG early (IMERG_E), late (IMERG_L) and final (IMERG_F) run products in precipitation estimations was evaluated over the Kelantan River Basin, Malaysia from 12 March 2014 to 31 December 2016. The three IMERG products were then incorporated into a calibrated Soil and Water Assessment Tool (SWAT) model to assess their reliability in streamflow simulations. Overall, monthly precipitation variability is well captured by the three SPPs. The IMERG_F exhibited a smaller systematic bias (RB = 7.14%) compared to the IMERG_E (RB = −10.42%) and IMERG_L (RB = −17.92%) in daily precipitation measurement. All the three SPPs (NSE = 0.66~0.71 and R 2 = 0.73~0.75) performed comparably well as precipitation gauges (NSE = 0.74 and R 2 = 0.79) in the daily streamflow simulation. However, the IMERG_E and IMERG_L showed a significant underestimation of daily streamflow by 27.6% and 36.3%, respectively. The IMERG_E and IMERG_F performed satisfactory in streamflow simulation during the 2014-2015 flood period, with NSE and R 2 values of 0.5~0.51 and 0.62~0.65, respectively. With a better peak flow capture ability, the IMERG_F outperformed the near real-time products in cumulative streamflow measurement. The study has also shown that the point-to-pixel or pixel-to-pixel comparison schemes gave comparable conclusions. Future work should focus on the development of a standardized GPM hydro-meteorological assessment framework, so that a fair comparison among IMERG validation studies can be conducted.

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“…Computation techniques for Qsurf and IR are described in the following sections. In SWAT-PADDY, the method to compute percolation of water from impoundment to soil which is used in the original or modified pothole [28,31] was not adopted, because soil water content and saturated hydraulic conductivity of surface soil layers are only the elements to determine the percolation rate and this leads to much underestimation of percolation in paddy fields [27]. In actual paddy fields, there is a constant water loss as a seepage through bund of paddy field and vertical percolation even though surface soils are saturated and hydraulic conductivity is very low because of puddling operation.…”

Section: Development Of Paddy Impoundment Modulementioning

confidence: 99%

Development of SWAT-PADDY for Simulating Lowland Paddy Fields

Tsuchiya

Kato

Jeong

et al. 2016

Preprint

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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.

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

Cited by 24 publications

References 22 publications

Urbanization dramatically altered the water balances of a paddy field-dominated basin in southern China

Urbanization dramatically altered the water balances of a paddy field-dominated basin in southern China

Hydro-Meteorological Assessment of Three GPM Satellite Precipitation Products in the Kelantan River Basin, Malaysia

Development of SWAT-PADDY for Simulating Lowland Paddy Fields

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