低Reynolds数乱流モデルを用いた, 水・底泥界面での物質移動の解析

抄録

A near-wall turbulence model is applied to the benthic boundary layer to analyze the diffusive transfer of dissolved substance across the sedimentwater interface. A modified turbulent kinetic energy balance is used to define eddy viscosity and eddy diffusivity in the viscous sublayer. The limiting behavior of turbulence quantities very near the bed is expressed as a power of z, the distance from the sediment-water interface. The predicted flux rate over a wide range of the Schmidt number and dissolved oxygen concentration profile near the bed are in good agreement with observations using microelectrodes.