Course of the Quality of Sand Covered on Polluted Bottom Mud in Osaka South Port

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  • 覆砂を行った大阪南港水域の底質について
  • フクサ オ オコナッタ オオサカ ナンコウ スイイキ ノ テイシツ ニ ツイテ

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Abstract

[Author abstract]In a heavily polluted water region bordering on the wharf of Osaka south port, sea bottom was covered with sand bed of ca. 50 cm thickness over the area of ca. 70,000 m^2. After the lapse of three years, the authors investigated the course of the quality of the sand. The covered sand bed below ca. 10 cm from the surface was kept clean through the year, while the surface layers were polluted considerably by the sedimentation of organic materials during summer, as similar as the uncovered bottom mud in the vicinity of the water region. From autumn to winter, the bottom sand turned to be clean, which may be attributed to the washing out of pollutants from the bottom sand due to the violent movement of overlying water by waves which rise in this seasons.[著者抄録]大阪湾南港岸壁に接した約7万m^2の水域に厚さ約50cmの覆砂が行れたので,その後の砂質の季節的変動について調査を実施した。その結果,海底から約10cm以深の砂質は,3年間経過後も清浄に保たれていること,夏季表層部の底砂は他の近隣水域と同様に著しく悪化するが,秋季から冬季にかけてきわめて清浄な砂質に変化すること等が明らかになった。これは,秋季以後本水域では波浪が卓越し,夏季に堆積していた有機物などが,底層水の流動によって底砂から洗い出されるためと考えられる。

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