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大規模埋立が沿岸海域の水環境に及ぼす影響評価に関する研究

大规模围填海对沿岸水环境影响评价研究

基本信息

批准号：
04202129
负责人：
中辻啓二
金额：
$ 1.6万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1992
资助国家：
日本
起止时间：
1992 至无数据
项目状态：
已结题

项目摘要

(1)大阪湾の流れの特性は?:三次元バロクリニックな流れの数値モデルを用いて大阪湾の潮流系、密度流系ならびに恒流系を平均大潮に対象に検討した。観測で明らかになっていた沖ノ瀬循環流と海深20m線に沿って形成される潮汐フロントの存在が数値実験で追認できた。両者は大阪湾の恒流系の形成や大阪湾での物質輸送に重要な役割を果たしている。数値実験で得られた潮流の変動時系列を調和分解した結果、(1)恒流系は潮流系と比較して微弱な流れではない。(2)大阪湾の恒流分布は沖ノ瀬環流(潮汐残差流)、湾奥部の密度流系の恒流、さらに潮流により形成され、密度流によって強化される東岸恒流帯に分類できる。(3)海峡周辺では潮流の非線形性によって2倍振動数の1/4日周期の流動成分が生起されている。(2)大阪湾の埋立はどの程度まで可能か?:前述した数値模型を用いて海深15m、18m以浅の海域の埋立てを想定した数値実験を行い、大阪湾内の流動特性に与える影響を検討した。物質輸送に直接関与する沖ノ瀬環流と潮汐フロントを指標にして影響の評価を行った。残差流系では、沖ノ瀬環流が全層にわたって顕著に現れており、その規模および流速は現状地形の場合とほぼ同じであった。一方、潮汐フロントに及ぼす影響は18m海深埋立の時には顕著に現れる。15m海深の埋立ではフロントの位置と強度は現状地形の場合とほぼ変わらないが、18m埋立の場合にはその位置は約5kmほど湾中央部に移動し、さらには鋭さは2倍程度強化されている。(3)流動・拡散の可視化:専門的知識を持ち合わせていない一般の人々にも研究の成果を理解でき、それに基づいて環境管理や環境創造の施策の意志決定に利用されるように、数値実験結果の可視化を目指してアニメソフトや粒子追跡ソフト等の開発を行った。

(1)Characteristics of Osaka Bay Stream: The three-dimensional tidal current system, density current system and constant current system in Osaka Bay are discussed. The number of tidal waves formed along the 20-meter line of the ocean current and the sea depth is recognized. The formation of the constant current system in Osaka Bay and the important effects of material transport in Osaka Bay The results of harmonic decomposition of power flow series are obtained.(1) Constant current system is compared with power flow system. (2)The distribution of constant currents in Osaka Bay is classified into two categories: the tidal residual currents, the constant currents in the density current system in the bay, the formation of the tidal currents, and the intensification of the density currents in the east coast. (3)The non-linear characteristics of the tidal current at the periphery of the Strait are caused by the occurrence of a flow component with a period of 1/4 day and a vibration number of 2 times. (2)Osaka Bay is a place where the sea is buried. The above numerical model is used to determine the depth of the shallow sea area at 15 m and 18 m, and to investigate the influence of the flow characteristics in Osaka Bay. Material transport is directly related to the impact of ocean currents and tidal currents on the evaluation of their effects. The residual current system is the same as that of the whole layer. A side, tide, and water impact is 18 m deep at sea level. The position and intensity of the buried water at 15 m depth are different from those of the existing terrain. The position of the buried water at 18 m depth is different from that of the central part of the bay. The position of the buried water at 15 m depth is different from that of the existing terrain. The position of the buried water at 18 m depth is different from that of the central part of the bay. The position of the buried water at 15 m depth is different from that of the existing terrain. The position of the buried water at 18 m depth is different from that of the existing terrain. The position of the buried water at 15 m depth is different from that of the existing terrain. The position of the buried water at 18 m depth is different from that of the existing terrain. The position of the buried water at 15 m depth is different from that of the central part of the bay. The intensity of the buried water at 18 m depth is different from that of the existing terrain. The position of the buried water depth is different from that of the existing topography. The position of the buried water depth is different from that of the existing topography. The position of the buried water depth (3)Visualization of flow and dispersion: knowledge of the door, integration, understanding, determination, utilization, determination of environmental management and environmental creation policies, visualization of results, visual guidance, particle tracking, etc.