Numerical Study on Nitrogen Dynamics and Scenario Analysis for Reducing Nitrogen in an Agricultural Pond using and Ecosystem Model - Collections | Kyushu University Library

＜departmental bulletin paper＞
Numerical Study on Nitrogen Dynamics and Scenario Analysis for Reducing Nitrogen in an Agricultural Pond using and Ecosystem Model

Creator	Author PID L002330 Creator Name 齋藤, 孝 Saito, Takashi サイトウ, タカシ Affiliation Affiliation Name 九州大学大学院生物資源環境科学府 Graduate School of Bioresource and Bioenvironment Sciences, Kyushu University
	Author PID K002875 Creator Name 原田, 昌佳 Harada, Masayoshi ハラダ, マサヨシ Affiliation Affiliation Name 九州大学大学院農学研究院 Faculty of Agriculture, Kyushu University
	Author PID K001582 Creator Name 平松, 和昭 Hiramatsu, Kazuaki ヒラマツ, カズアキ Affiliation Affiliation Name 九州大学大学院農学研究院 Faculty of Agriculture, Kyushu University
	Author PID K001643 Creator Name 森, 牧人 Mori, Makito モリ, マキト Affiliation Affiliation Name 九州大学大学院農学研究院 Faculty of Agriculture, Kyushu University
Language	Japanese
Publisher	九州大学大学院農学研究院
Publisher	Faculty of Agriculture, Kyushu University
Date	2006-10-27
Source Title	Science bulletin of the Faculty of Agriculture, Kyushu University
Vol	61
Issue	2
First Page	297
Last Page	301
Publication Type	Version of Record
Access Rights	open access
JaLC DOI	https://doi.org/10.15017/8861

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PISSN	1347-0159
NCID	AA11577672
Record ID	8861
Peer-Reviewed	Unrefereed
Subject Terms	Geo-Environment Science
Subject Terms	地水環境学
Notes	本論文では福岡県糟屋郡篠栗町大勢門地区のといし河原池を対象に,硝酸態窒素･亜硝酸態窒素,アンモニア態窒素,有機態窒素を指標とした生態系モデルを用いて,窒素の動態モデルを構築した.本モデルでは,各態窒素の動態をワンボックスモデルによって表し,モデルパラメータは既往の文献値から,あるいは試行錯誤的に設定した.2005年9月～11月に実施した水質観測を本モデルにより再現し,計算結果と実測値を比較した.その結果,両者に若干のズレは生じたものの,計算結果は実測値を概ね再現できたことから,本モデルにより硝酸態窒素･亜硝酸態窒素,アンモニア態窒素,有機態窒素の大局的な挙動を予測することは可能であると考えられた.解析対象池では,流入水と池水のTNは同程度にあり,農業用水水質基準を大きく超える高濃度の窒素が流出していた.そこで,池内の窒素低減のために,流入負荷をどの程度削減すればよいかをシナリオ分析により検討した.その結果,現在の流入水中の窒素量の60%以上を削減することにより,池内のTNは水質基準である1mg/Lを下回ることが示唆された.
Notes	A mathematical model was developed for predicting the daily variation in water quality of Toisigawara-ike, which is a small agricultural pond in Sasaguri Town, Fukuoka Prefecture, Japan. This model took into consideration the ecosystem's processes. In the modeling, the interactions among the three water quality indices of NOx-N, NH_4 -N, and Org-N were described by first-order kinetics. The model parameters were determined by referring to previous literatures and by conducting trial-and-error optimizations. The results indicated that the ecosystem model could successfully reproduce the daily variation in reservoir water quality despite its relatively simple model structure. Next, we investigated the issue of total nitrogen concentration because this value in the pond was much higher than the Japanese water quality standard required for paddy irrigation. In order to reduce the total nitrogen level in this pond to the level of paddy irrigattion, we examined how much the inflow load should be reduced based on the scenario analyses using the ecosystem model. The results indicated that it was necessary to reduce the current inflow load of nitrogen by 60% or more.
Type	紀要論文
Created Date	2009.04.22
Modified Date	2022.11.11