Mixing within a Free Floating Mesocosm Using Surface Ocean Wave Energy.

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  • HARADA Shigeki
    Laboratory of Marine Environment, National Institute for Environmental Studies
  • ADAMS E. Eric
    Department of Civil and Environmental Engineering, Massachusetts Institute of Technology
  • TAKATA Rosalind K.
    Massachusetts Institute of Technology

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Other Title
  • 波エネルギーを用いた浮遊型海洋メゾコズム内のミキシングに関する研究
  • ナミ エネルギー オ モチイタ フユウガタ カイヨウ メゾコズム ナイ ノ ミキシング ニ カンスル ケンキュウ

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Abstract

Mixing inside free floating mesocosms (marine enclosures) is essential to reproduce the marine surface environment. Thus, two devices, a disc and a pump were developed and deployed into a reduced scale (about 1/10) mesocosm. The disc device is comprised of a wooden seesaw, a float and five perforated discs. The pump device is comprised of the same seesaw and float and a plastic pipe with a check valve. Both devices transfer energy into the mesocosm in response to the movement of the float outside the mesocosm. These two devices provided turbulent mixing and/or upward vertical advection, resulting in stronger mixing than in the control case (with no device). On the other hand, when waves were strong, enough mixing was occurred in the control case. Optimal design of mesocosms in terms of selection and/or combination of such devices (including the do nothing case) depends highly on the strength of wave fields.

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