coawst in kyoto
DESCRIPTION
COAWST in Kyoto. 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. - PowerPoint PPT PresentationTRANSCRIPT
Nobuhito Mori and Junichi NinomiyaDisaster Prevention Research Institute
Kyoto University, Japan
CollaboratorsJohn 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 z0air, z0
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 50-100 m
Momentum roughness length at ASI3 |
Drag coefficient
Momentum flux
Thermal roughness length
Surface exchange coefficient
Sensible heat
Latent heat, etc.
Momentum roughness length
Viscous term Wave term
Charnock:Calm sea ...Long swellChoppy wind sea
Ocean
Atmosphere
3 |
By Elodie CHARLES
Impact of wave coupling: Charnock vs TY
2014/8/21
Mean(10/6 21:00 - 10/7 3:00)
Friction Velocity, Sensible/Latent heat fluxRear 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
U10 [m/s]
u* [m/s]
Sensible heat [W/m2]
Latent heat [W/m2]
Z0 byCharnockTaylor-YellandOostDrennan
U10 [m/s]
u* [m/s]
Sensible heat [W/m2]
Latent heat [W/m2]
Application to climate change study
Case study of TC Haiyan SSTCase 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 driftTheory
kh=0.50JONSWAP g=2.0Mitsuyasu N=10
kh=2.0JONSWAP g=2.0Mitsuyasu 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
0mkak p
Inlet Test: Snapshot of ubar and vbar
2D Irregular1D Regular