Variation of the drag coefficient with wind and wave state
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Authors
Byars, Beverly J.
Subjects
marine atmospheric boundary layer
neutral drag coefficient
drag coefficient
diurnal variations
dissipation method
neutral drag coefficient
drag coefficient
diurnal variations
dissipation method
Advisors
Davidson, K.L.
Geernaert, G.L.
Date of Issue
1985-09
Date
Publisher
Language
en_US
Abstract
The dissipation method is used to obtain estimates for
the friction velocity, U>t, as well as values for the neutral
drag coefficient, C-^jj, for data collected from a coastal
tower off San Diego, California. C-q-^ is found to be independent
of the ten-meter height windspeed, U-j^q, for velocities
between 4-9 m/sec. Its value is estimated to be
(0.94+0.4)10 which compares well with values by Smith
(1980) and Large and Pond (1981). Definite trends in C-q-^
with fetch and sea state are also observed. Drag coeffcient
estimates are found to be higher for short fetch than for
long fetch conditions. C-q^ is also seen to increase sharply
just before frontal passages and during sea breeze conditions
when the waves are actively growing. With the windspeed
and wave field reaching equilibrium, C-q-^ is found to
decrease with time to a smaller and more constant value.
Type
Thesis
Description
Series/Report No
Department
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Format
110 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.