神戸大学附属図書館デジタルアーカイブ
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https://doi.org/10.24546/80050004
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2024-04-20
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80050004 (fulltext)
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メタデータID
80050004
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open access
出版タイプ
Version of Record
タイトル
陸域からマニラ湾への物質負荷低減に伴う海洋環境の応答
リクイキ カラ マニラワン エノ ブッシツ フカ テイゲン ニ トモナウ カイヨウ カンキョウ ノ オウトウ
その他のタイトル
Numerical analysis of the response of marine environment in Manila Bay to the reduction of material loading from land area.
著者
著者名
林, 美鶴
Hayashi, Mitsuru
ハヤシ, ミツル
著者名
柳, 哲雄
Yanagi, Tetsuo
ヤナギ, テツオ
収録物名
神戸大学大学院海事科学研究科紀要
Review of the Faculty of Maritime Sciences, Kobe University
巻(号)
04 <商船・理工論編>
ページ
39-44
出版者
神戸大学海事科学部
刊行日
2007-07
公開日
2007-11-13
抄録(自由利用可)
Recently, water quality of Manila Bay has been deteriorated and red tides frequently occur. The limiting nutrient of the primary production in Manila Bay is nitrogen. Therefore the nitrogen cycling in Manila Bay in dry and rainy seasons were calculated, and the calculation result that full TN was loaded from rivers was compared with the case of 1/2 loading. The primary production in rainy season is higher than in dry season because dissolved inorganic nitrogen (DIN) concentration is high. DIN is assimilated by phytoplankton, and phytoplankton is grazed by zooplankton and/or is moralized, and sank to the lower layer as dtritus. But detritus is back to the upper layer due to the vertical mixing. Because stratification is weak in dry season. The main source of DIN is decomposition in dry season. On the other hand, stratification and estuarine circulation is strong in rainy season. Therefore detritus sank to the lower layer, then DIN is regenerated in the lower layer and is transported to the upper layer due to the strong estuarine circulation. The residence time of TN (Total Nitrogen) in the upper layer in dry season is longer than in rainy season. Nitrogen is used slowly and many times in dry season. But nitrogen is sufficiently supplied, and is used quickly by primary production in rainy season. And also it flow out quickly by strong estuarine circulation. The reduction ratio of nitrogen concentration is only about 15%, when nitrogen loading from rivers is reduced to the half. Because decomposed DIN in Manila Bay is more than the loading DIN from rivers. Moreover, the reduction ratio of TN, especially organic matter in dry season is smaller. Because suspended solid in the lower layer is much and stratification in dry season is weak, so the suspended solid from the lower layer supports the material cycling of the upper layer in dry season. Influence of suspended solid in the lower layer to the material cycling of Manila Bay is large.
カテゴリ
神戸大学大学院海事科学研究科紀要
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04号
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04号<商船・理工論編>(2007-07)
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資源タイプ
departmental bulletin paper
言語
Japanese (日本語)
ISSN
2185-2804
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eISSN
2187-3232
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NCID
AA12581493
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関連情報
NAID
110006667509
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