CONTRIBUTION OF BOTTOM-LAYER WATER AND SEDIMENTS TO OXYGEN CONSUMPTION —THEORETICAL CONSIDERATIONS OF EXPERIMENTAL RESULTS—

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  • TOKUNAGA Takahisa
    国立研究開発法人水産研究・教育機構 西海区水産研究所
  • KIMOTO Katsunori
    国立研究開発法人水産研究・教育機構 西海区水産研究所

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Other Title
  • 底層水と堆積物による酸素消費寄与率 －実験結果を用いた理論的考察－
  • CONTRIBUTION OF BOTTOM-LAYER WATER AND SEDIMENTS TO OXYGEN CONSUMPTION —THEORETICAL CONSIDERATIONS OF EXPERIMENTAL RESULTS—

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In order to clarify the relative contributions of bottom-layer water and sediments to oxygen consumption, theoretical considerations of oxygen consumption rates were analyzed based on existing experimental results. The contribution of bottom-layer water to oxygen consumption increased with the height of the bottom-layer increased. In addition, the contribution of bottom-layer water to oxygen consumption varied significantly depending upon the relative rates of oxygen consumption by the sediments and the bottom-layer water. The height of the bottom-layer water column where the rate of oxygen consumption was 50% (H50) was also calculated and compared with the height of the bottom-layer water. Offshore measurements taken near Takezaki in the inner Ariake bay showed that the height of the water column of bottom-layer water was always greater than H50, suggesting that high levels of oxygen consumption occurred in the bottom layer water. Conversely, the relationship between the water column height of the bottom-layer water and H50 was variable at the tidal flat margin, suggesting that both sediments and the bottom-layer water need to be considered in case of oxygen consumption processes.

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