Nobuhito Mori and Junichi Ninomiya Disaster Prevention Research Institute Kyoto University, Japan Collaborators John C. Warner (USGS) Eric D’Asaro (U Washington)

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Presentation transcript:

Nobuhito Mori and Junichi Ninomiya Disaster Prevention Research Institute Kyoto University, Japan Collaborators John C. Warner (USGS) Eric D’Asaro (U Washington) C.T Chen (NCDR, Taiwan) Metrological Research Institute, Japan + Central Weather Bureau, Taiwan COAWST in Kyoto August 25-28, WHOI

On Going Studies Typhoon modeling: WRF-ROMS-SWAN  Target  Sensitivity of wave effects via z 0 air, z 0 water and TKE  Current status  Typhoon Mellor (2010), Fanapi (2010) plus 4-6 events  Resolution  ROMS: 1-5 km Wave effects on current: ROMS-SWAN  Target  Directional wave effects for vortex force  Current status  Theory and preliminary test  Resolution  ROMS: about m

Momentum roughness length at ASI 3 | Drag coefficient Momentum flux Thermal roughness length Surface exchange coefficient Sensible heat Latent heat, etc. Momentum roughness length Viscous termWave term Charnock: Calm sea... Long swell Choppy wind sea Ocean Atmosphere 3 | By Elodie CHARLES

Impact of wave coupling: Charnock vs TY 2014/8/21 Mean(10/6 21: /7 3:00)

Friction Velocity, Sensible/Latent heat flux Rear Side 2009/10/6 18:00 – 10/7 00:00 UTC Oost results have peak value at closer to center of typhoon. The larger friction velocity and heat flux are estimated by with wave model U 10 [m/s] u * [m/s] Sensible heat [W/m 2 ] Latent heat [W/m 2 ] Z0 by Charnock Taylor-Yelland Oost Drennan U 10 [m/s] u * [m/s] Sensible heat [W/m 2 ] Latent heat [W/m 2 ]

Application to climate change study Case study of TC Haiyan SST Case study of Seto-Inland Sea in Japan Present 2100

Random wave effects on current COAWST only uses Hs and Tm01 from SWAN to ROMS Kumer et al. (2012)

Stokes drift Theory kh=0.50 JONSWAP  =2.0 Mitsuyasu N=10 kh=2.0 JONSWAP  =2.0 Mitsuyasu N=10

Implementation of random wave effects to COAWST Unidirectional regular wave stokes drift Multidirectional irregular wave stokes drift Methodology  Assuming directional spectra shape and communicate frequency and directional bandwidth by coupler  Communicate directional spectra directly

Inlet Test: Snapshot of ubar and vbar 2D Irregular 1D Regular