E326 藻場キャノピー周辺の波動・流動・乱流構造に関する実験的研究

概要

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For proper understanding of hydrodynamic characteristics of seagrass bed canopy, it is of crucial importance to clarify the effects of flexibility of seagrass on the surrounding current field. For this purpose, we made detailed measurements of velocity field by using LDV and flow visualization technique for flexible and non-flexible seagrass model bed installed in a wave flume. In the flexible seagrass model. Eulerian mean velocity and mass transport velocity were found to occur in the opposite direction of wave propagation near the top of the seagrass canopy. In the surface layer above the canopy, the mean velocities were in the direction of wave propagation. On the contrary, in the non-flexible seagrass model, the entirely opposite pattern was observed in the mean velocity profiles. It was also found out that there arised a large-scale flow circulation around the seagrass bed canopy, with upwelling mean flow in and above the seagrass canopy. This circulation may have an important role in the suspension mechanism for particulate matters around a seagrass canopy.
日本流体力学会の論文
2002-07-23