IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME D: Maritime and Coastal Research and Engineering : Research on improvement of sediment by current control technology
Research on improvement of sediment by current control technology
Author : Masashi MIYAGAWA , Takashi HOSHINO, Yoshihiro SUENAGA, Kousaku YAMAOKA , Manabu MATSUSHIMA and Ahn HEE-DO
Issue of sediment deterioration in semi-enclosed sea for maintaining biological production process has not been solved for many years and must be one of the most challenging themes. Various methods have been examined to clear this problem, sediment degradation, though, none of the effective methods improving sediment condition in the seabed without any help of external energy such as fossil energy source has not developed yet.Thus we propose new method, the distinctive structure and new technology, that improves sediment condition by current control at the bottom layer by means of ocean energy, tidal current, for increase of the dissolved oxygen concentration in the bottom layer water. This structure was designed as an effective generator of upwelling and downward current accelerating vertical mixture of the bottom water mass.In this study we examined the highly detailed current condition around the structure by both numerical calculation and hydraulic experiment. Result of this survey apparently demonstrates that installation of the structure generates vertical mixture of the bottom seawater. We hope that this vertical mixture improves sediment condition in the longer term by promoting increase of dissolved oxygen concentration of the bottom seawater.Furthermore, we monitored the fluctuation of sulfide, COD and oxidation reduction potential to grasp long term advantageous effect of the installation of the structure.
File Size : 1,116,685 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME D: Maritime and Coastal Research and Engineering
Date Published : 01/07/2007
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