Numerical study on the effect of artificial mound settled in the shallow ocean for CO2 fixation
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An artificial mound was settled in the shallow ocean to enhance vertical mixing of nutrients and consequent primary production. It is expected that this technology contributes to the biological fixation of CO2 in the ocean. The turbulent mixing generated by the interaction between tidal currents and the mound was numerically simulated by using large eddy simulation in the cases of spring and half tides. The energy dissipation rate calculated from the numerical simulation shows a large horizontal variation when the tidal speed is large and a clear enhancement by the mound can be seen. The comparison between numerical result and the measurement implies that the location of the measurement was not included in the region of large energy dissipation. The vertical diffusivity was estimated from the numerical result to roughly quantify the vertical diffusive velocity of nutrients, which was enhanced up to 10−6–10−5 m s−1 when the tidal speed is its maximum, while it was 10−7 m s−1 when the effect of the mound is little .
KeywordsArtificial mound Large eddy simulation Energy dissipation rate Vertical diffusivity Biological CO2 fixation Primary production
The present study was supported in part by the Research Institute of Innovative Technology for the Earth (RITE).
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