Development and validation of a basin scale model PCPF-1@SWAT for simulating fate and transport of rice pesticides

Boulangé, Julien; Watanabe, Hirozumi; Inao, Keiya; Iwafune, Takashi; Zhang, Minghua; Luo, Yuzhou; Arnold, J. G.

doi:10.1016/j.jhydrol.2014.05.013

Cited by 38 publications

(64 citation statements)

References 57 publications

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“…Therefore, mathematical models to predict pesticide concentrations in surface water or sediments of paddy elds have been developed, 17,[20][21][22][23] some of which focus on the percentage of the applied pesticide found in runoff from paddy elds. 24,25 Several spatially explicit, geographic information system (GIS)-based fate models have been developed to estimate pesticide concentrations in surface water, [26][27][28] but an immense amount of time and effort must be expended to scale up these models to elds nationwide. The model developed by Yachi et al 14 can estimate the regionspecic PECs of paddy pesticides in river water at 350 sites.…”

Section: -19mentioning

confidence: 99%

Development and validation of a simulation method, PeCHREM, for evaluating spatio-temporal concentration changes of paddy herbicides in rivers

Imaizumi

Suzuki

Shiraishi

et al. 2018

Environ. Sci.: Processes Impacts

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In pesticide risk management in Japan, predicted environmental concentrations are estimated by a tiered approach, and the Ministry of the Environment also performs field surveys to confirm the maximum concentrations of pesticides with risk concerns. To contribute to more efficient and effective field surveys, we developed the Pesticide Chemicals High Resolution Estimation Method (PeCHREM) for estimating spatially and temporally variable emissions of various paddy herbicides from paddy fields to the environment. We used PeCHREM and the G-CIEMS multimedia environmental fate model to predict day-to-day environmental concentration changes of 25 herbicides throughout Japan. To validate the PeCHREM/G-CIEMS model, we also conducted a field survey, in which river waters were sampled at least once every two weeks at seven sites in six prefectures from April to July 2009. In 20 of 139 sampling site-herbicide combinations in which herbicides were detected in at least three samples, all observed concentrations differed from the corresponding prediction by less than one order of magnitude. We also compared peak concentrations and the dates on which the concentrations reached peak values (peak dates) between predictions and observations. The peak concentration differences between predictions and observations were less than one order of magnitude in 66% of the 166 sampling site-herbicide combinations in which herbicide was detected in river water. The observed and predicted peak dates differed by less than two weeks in 79% of these 166 combinations. These results confirm that the PeCHREM/G-CIEMS model can improve the efficiency and effectiveness of surveys by predicting the peak concentrations and peak dates of various herbicides. Environmental signicancePesticides pose potential risks to aquatic ecosystems. Multiple pesticides are oen used simultaneously in agricultural elds over a relatively short period, and such use leads to spatially and temporally skewed distributions of pesticide concentrations in rivers. Methods capable of evaluating dynamic changes in the spatial distributions of multiple pesticides in the environment are needed for pesticide risk management. We developed a simulation method for evaluating daily concentration changes at a resolution of several kilometers, and then, focusing on paddy herbicides, we used a multimedia environmental fate model to calculate concentrations of 25 herbicides in rivers throughout Japan. Finally, we validated the results with monitoring data. This work will contribute to pesticide risk assessment efforts by making it possible to predict both peak pesticide concentrations and the dates on which the concentrations reach their peak values.

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Section: -19mentioning

confidence: 99%

Development and validation of a simulation method, PeCHREM, for evaluating spatio-temporal concentration changes of paddy herbicides in rivers

Imaizumi

Suzuki

Shiraishi

et al. 2018

Environ. Sci.: Processes Impacts

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“…In previous researches, the pothole module was used to model impoundment in paddy fields [30][31][32]. However, computational algorithm of the pothole model is not targeted on hydrological process in paddy fields ( Figure 1).…”

Section: Development Of Swat-paddymentioning

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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“…For block‐scale applications, the PCPF‐B can be used . At the watershed scale, simulation of the fate and transport of rice pesticide can be performed by (i) the River Water Quality (RIVWQ) integrated with RICEWQ (RICEWQ‐RIVWQ), (ii) the PADDY‐Large, (iii) the Soil and Water Assessment Tool (SWAT) combined with PCPF‐1 (PCPF‐1@SWAT), and (iv) the Dynamic in‐River Agrochemical Fate and Transport (DRAFT) coupled with PCPF‐1 for paddy block scale (PCPF‐B) and the land use based tank (PCPF‐B/DRAFT) models . The potential environmental risks posed by rice pesticide in a watershed can be evaluated using the last four models.…”

Section: Introductionmentioning

confidence: 99%

“…The potential environmental risks posed by rice pesticide in a watershed can be evaluated using the last four models. However, both the RICEWQ‐RIVWQ and PADDY‐Large algorithms focus on simulating paddy hydrology and ignore other types of land use, which may significantly contribute to the watershed hydrology and thus affect the accuracy of the predicted pesticide concentrations in the watershed . For PCPF‐B/DRAFT model, although it considers paddy and upland hydrology on the basis of the land use based tank model, the PCPF‐B/DRAFT model can only be used to simulate the fate and transport of rice pesticide.…”

Section: Introductionmentioning

confidence: 99%

Improvement and application of the PCPF‐1@SWAT2012 model for predicting pesticide transport: a case study of the Sakura River watershed

Tú

Boulangé

Iwafune

et al. 2018

Pest Management Science

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Development and validation of a basin scale model PCPF-1@SWAT for simulating fate and transport of rice pesticides

Cited by 38 publications

References 57 publications

Development and validation of a simulation method, PeCHREM, for evaluating spatio-temporal concentration changes of paddy herbicides in rivers

Development and validation of a simulation method, PeCHREM, for evaluating spatio-temporal concentration changes of paddy herbicides in rivers

Development of SWAT-PADDY for Simulating Lowland Paddy Fields

Improvement and application of the PCPF‐1@SWAT2012 model for predicting pesticide transport: a case study of the Sakura River watershed

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