PERFORMANCE OF VERTICAL MIXING SCHEMES BASED ON IN-SITU MEASUREMENT OF DEEP SEA TURBULENCE IN SAGAMI BAY

Abstract

 We carried out in-situ measurement of deep-sea turbulence in Sagami Bay and hydrodynamic simulation using three vertical mixing schemes (standard k-ε model, Mellor (2001) model, and Furuichi et al. (2012) model) to investigate their reproducibility performances. One of four measurements indicated that dissipation rate of turbulent kinetic energy reached 10^-6m²s^-3 near deep seabed at about 1000 m depth, and that thickness of bottom mixing layer with 10^-7m²s^-3 was approximately 150 m. All simulated results underestimated the mixing layer thickness. Among them, Furuichi et al. (2012) model was able to simulate relative large thickness without depending on bottom boundary conditions. It is suggested that Furuichi et al. (2012) model might be expected to be improved by modifying parameterization of turbulence length scale.