Final published version
Research output: Contribution to conference - Without ISBN/ISSN › Conference paper › peer-review
Short-term variability of wind measurements in South China Sea. / Muyau, J.; Ewans, K.; Jonathan, P.
2014. 1990-2001 Paper presented at Offshore Technology Conference-Asia, Kuala Lumpur, Malaysia.Research output: Contribution to conference - Without ISBN/ISSN › Conference paper › peer-review
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TY - CONF
T1 - Short-term variability of wind measurements in South China Sea
AU - Muyau, J.
AU - Ewans, K.
AU - Jonathan, P.
PY - 2014
Y1 - 2014
N2 - Good understanding of the wind characteristics is essential in offshore structural design and operational activities. The short-term variability of wind is captured in design codes with prescribed forms for the wind spectrum and for the ratio of mean wind speed maxima for given durations to the one hour mean. Relationships are also prescribed for scaling these wind speeds between different elevations, essentially defining the wind profile in the turbulent boundary layer. All of these are based largely on measurements made in mid-latitude regions during extra-tropical storms or hurricanes; but these measurements will not be representative of the wind field during squalls, which are not stationary, and possibly not representative of the wind field during general monsoonal conditions. Several years of continuous recordings of wind speed and direction, sampled at 1Hz, at several South China Sea locations allow us to examine the short-term variability of wind in squalls and monsoonal conditions, and allow comparison with expressions given in design codes. We investigate the variability of the stationarity of the winds, the wind spectrum, the mean wind speed, and the wind profile, for the South China Sea measurements. The premise for the short-term variability prescriptions is that the wind field is stationary. Accordingly, we first report our evaluation of this assumption, and based on this, our evaluation of the relevance of the various prescriptions in the codes for describing short-term variability is developed. Copyright 2014, Offshore Technology Conference.
AB - Good understanding of the wind characteristics is essential in offshore structural design and operational activities. The short-term variability of wind is captured in design codes with prescribed forms for the wind spectrum and for the ratio of mean wind speed maxima for given durations to the one hour mean. Relationships are also prescribed for scaling these wind speeds between different elevations, essentially defining the wind profile in the turbulent boundary layer. All of these are based largely on measurements made in mid-latitude regions during extra-tropical storms or hurricanes; but these measurements will not be representative of the wind field during squalls, which are not stationary, and possibly not representative of the wind field during general monsoonal conditions. Several years of continuous recordings of wind speed and direction, sampled at 1Hz, at several South China Sea locations allow us to examine the short-term variability of wind in squalls and monsoonal conditions, and allow comparison with expressions given in design codes. We investigate the variability of the stationarity of the winds, the wind spectrum, the mean wind speed, and the wind profile, for the South China Sea measurements. The premise for the short-term variability prescriptions is that the wind field is stationary. Accordingly, we first report our evaluation of this assumption, and based on this, our evaluation of the relevance of the various prescriptions in the codes for describing short-term variability is developed. Copyright 2014, Offshore Technology Conference.
KW - Boundary layer flow
KW - Codes (symbols)
KW - Offshore structures
KW - Storms
KW - Structural design
KW - Mean wind speed
KW - Operational activity
KW - South China sea
KW - Turbulent boundary layers
KW - Wind characteristics
KW - Wind measurement
KW - Wind profiles
KW - Wind speed and directions
KW - Wind effects
U2 - 10.4043/24904-MS
DO - 10.4043/24904-MS
M3 - Conference paper
SP - 1990
EP - 2001
T2 - Offshore Technology Conference-Asia
Y2 - 25 March 2014 through 28 March 2014
ER -