Optimal Allocation of Maximum Allowable Discharged Total Nitrogen Load among Field Plots in Agricultural Watershed
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- MAEDA Shigeya
- Graduate School of Agricultural Science, Kyoto University
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- YOSHIKAWA Kazuki
- Graduate School of Agricultural Science, Kyoto University
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- TAKEUCHI Junichiro
- Graduate School of Agricultural Science, Kyoto University
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- KAWACHI Toshihiko
- Graduate School of Agricultural Science, Kyoto University
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- CHONO Shunsuke
- Graduate School of Agricultural Science, Kyoto University
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- UNAMI Koichi
- Graduate School of Agricultural Science, Kyoto University
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Abstract
A multiobjective optimization model is developed for controlling TN (Total Nitrogen) load discharged from field plots in an agricultural watershed. In optimization, maximizations of allowable TN discharge per unit area and total yield of rice are intended while complying with an effluent limitation standard prescribed for river water quality management. The discharge from a field plot is separated into two components, i.e., direct runoff and baseflow. As discharged TN from a plot travels with these components toward an outlet of the watershed, the amount of TN is assumed to decrease due to distance-related self-purification occurring in subsurface zone, drainage canal and river. Locations of field plots and traveling routes of TN are identified or predicted by a GIS (Geographic Information System) with a digital elevation model and by field surveys. The model developed is applied to an agricultural watershed bordering with Lake Biwa in Shiga Prefecture, Japan. The result demonstrates that the optimal allocation of maximum allowable discharged TN load among field plots is helpful in prioritizing plots where fertilization should be reduced.
Journal
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- Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering
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Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 78 (1), 23-31, 2010
The Japanese Society of Irrigation, Drainage and Rural Engineering
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Keywords
Details 詳細情報について
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- CRID
- 1390282680263863680
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- NII Article ID
- 10026349285
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- NII Book ID
- AA12240517
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- ISSN
- 18847242
- 18822789
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- NDL BIB ID
- 10601293
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed