A field-scale observation method for non-point source pollution of paddy fields

•Water depth decrease rate due to ET and infiltration is stable and identifiable.•ET and infiltration can be determined through variation of water depth.•Method is applicable to rice fields with multi-outlets and variable ridge heights. In order to eliminate the limitations of conventional field-sca...

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Bibliographic Details
Published in:Agricultural water management 2014-12, Vol.146, p.305-313
Main Authors: Huang, Ning-bo, Su, Bao-lin, Li, Rui-rui, Yang, Wu-zhi, Shen, Meng-meng
Format: Article
Language:English
Subjects:
Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agricultural and forest meteorology
Agronomy. Soil science and plant productions
Biological and medical sciences
Evapotranspiration and infiltration loss
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Infiltration
Non-point source pollution
Outflow
Paddy field
Pollution abatement
Pollution sources
Rainfall
Runoff observation
Seasons
Surface water
Water balance and requirements. Evapotranspiration
Water pollution
Water quality
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Summary:•Water depth decrease rate due to ET and infiltration is stable and identifiable.•ET and infiltration can be determined through variation of water depth.•Method is applicable to rice fields with multi-outlets and variable ridge heights. In order to eliminate the limitations of conventional field-scale observation methods for non-point source (NPS) pollution, this paper proposes a direct method to observe NPS pollution from paddy fields. The evapotranspiration (ET) and infiltration loss hydrographs of paddy fields in different stages of growing season are estimated depended on observed water-depth hydrograph, rainfall hydrograph and irrigation data. And outflow hydrograph of paddy fields is analyzed through water balance approach. Combined with observed surface water quality data, loads of NPS pollution in outflow from the paddy field can be derived. The proposed method can be applied to quantificational observation of NPS pollution from paddy field in the condition of multi-outlets and dynamic variation of the lowest outlet height during growing season, which is impossible to conduct field observation by using conventional methods. The proposed method reduces the uncertainty of runoff observation and is more operable.
ISSN:0378-3774
1873-2283
DOI:10.1016/j.agwat.2014.09.004