Water quality modeling to evaluate BMPs in rice paddies

A water quality model applicable to rice paddies was developed using field data from 1999-2002. Use of the Dirac delta function efficiently explained the nutrient-concentration characteristics of ponded water. The model results agreed reasonably well with the observed data. The ponded-water quality...

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Bibliographic Details
Published in:Water science and technology 2006, Vol.53 (2), p.253-261
Main Authors: Jeon, J H, Yoon, C G, Hwang, H S, Jung, K W
Format: Article
Language:English
Subjects:
Agriculture - methods
Biological fertilization
Cultivation
Delta function
Drainage
Drainage management
Environmental Monitoring - methods
Fertilization
Fertilizers
Korea
Methods
Mineral nutrients
Modelling
Models, Theoretical
Nitrogen
Nutrient concentrations
Nutrient loading
Oryza
Oryza sativa
Pesticide Residues - analysis
Phosphorus
Rain
Rice fields
Soil Pollutants
Stormwater
Surface drainage
Water Movements
Water Pollutants, Chemical - analysis
Water Pollution
Water quality
Water Supply
Weirs
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Summary:A water quality model applicable to rice paddies was developed using field data from 1999-2002. Use of the Dirac delta function efficiently explained the nutrient-concentration characteristics of ponded water. The model results agreed reasonably well with the observed data. The ponded-water quality was influenced primarily by fertilization; nutrient concentration was especially high during early cultivation periods. Reducing surface drainage during the fertilization period may substantially reduce nonpoint source loading from paddies. Increased weir heights and shallow irrigation methods were evaluated by the model as practical methods for reducing nutrient loading from paddies. These methods were effective in reducing surface drainage and are suggested as "best management practices" (BMPs) if applied based on site-specific paddy conditions.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2006.059