the wave modelling (wam) grouphome.kpn.nl/g.j.komen/komen-hasselfest-wam.pdf · wind input,...
TRANSCRIPT
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The Wave Modelling (WAM) Group
A historical perspective
Gerbrand Komen
Peter Janssen
Luigi Cavaleri
Hamburg, November 2011
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Klaus Hasselmann
80th anniversary
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http://www.knmi.nl/waveatlas, Caires, Sterl, Komen and Swail
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Pre-WAM
WAM (~1984 – 1994)
Post WAM
WAve Modelling group = WAM
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Theory Wave spectrum, Dynamic equation, Wave generation,
Wave-wave interaction, Wave dissipation
Observations Swell propagation, JONSWAP, . .
Second generation wave prediction models
HYPA, GONO, UKMO, . .
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Theory: spectral energy balance equation
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Observations: JONSWAP
Spectral evolution under fetch-limited growth conditions
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Based on scaling laws
Included ‘new theory’ without explicitly computing
wave-wave interactions
Validation
Intercomparison → SWAMP
Second generation wave prediction models
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amazon.com, 2011
Miami 1981 / Plenum 1985
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Landmarks
Hamburg 1984: founding of WAM group Susanne Hasselmann Miami 1981, Exact NL
Hamburg 1983, numerical study of the actual energy balance
growing waves
Annual meetings (1984 until 1992) Funding: EU, SCOR
ECMWF > 1985 special project > 1990 ECMWF Optional Project
Final report 1994
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Objectives
Joint development 3G wave model
Organisation
Many people, loosely organized
Several subgroups model implementation: global/regional
reanalysis of wave growth observations
directional effects
data assimilation of satellite observations
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Modelling group
Source terms wind input, quasi-linear theory (Peter Janssen)
nonlinear transfer
dissipation/whitecapping
shallow water effects
current refraction, sea ice
Operational implementation at ECMWF and
elsewhere
Validation against observations
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The energy balance for growing waves for
a typical wind speed
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The vision: assimilation of observations and forecasting
in one integral system
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Susanne Hasselmann, Ninth WAM meeting, Sylt, June 1991
Excursion by boat to Hallig Hooge
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Fourth WAM meeting, Venice, 1986
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Peter Janssen, KNMI 1994.
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Luigi (’Gigi’) Cavaleri, Sixth WAM meeting,
Valencia, 1989
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Heinz Günther, Sendai, 1984
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Liana Zambresky with her cat
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Vince Cardone, Mark Donelan, Lewex Symposium, Baltimore, 1986
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Annual meetings (1984 - 1992)
Course on Ocean Waves and Tides (ICTP, 1988)
Dynamics and Modelling of Ocean Waves (1994)
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ICTP, 1968 with Abdus Salam and P.A.M. Dirac
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October 1988, Acqua Alta
platform, ISDGM/CNR
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Selected students, Course on Ocean Waves and Tides, 1988
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1994
Final Report, published by CUP
500+ pages
Book presentation, KNMI 1994
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ECMWF Medium-range forecasting
New satellites, real time comparison
Operational validation of different wave models
(JCOMM)
Research on freak waves; interaction of ocean waves
with airflow and ocean circulation
WISE group Many regional applications
KNMI Decadal variability in global extreme statistics
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Improving medium-range forecasting at ECMWF
Surface winds (≈ 70%)
Representation of wind input source term (two-way interaction between waves and airflow)
Representation of wave dissipation
Numerics
Representation of unresolved bathymetry
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Many challenges remain, even today . .
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Dynamical description of the evolution of ocean
waves
A third generation wave prediction model for global
and regional applications
Wave observation from space
Building of a global wave research community
Klaus (and Susanne) Hasselmann' made essential
contributions to
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WISE, 2006, Venice
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