monochromatic waves. Therefore, care should be exercised in analyzing the raw

time-series data in either time or frequency domain. It may be appropriate for the

user of the data to view the data carefully and select later segments of the data

stream for comparison to numerical model estimates.

ETABAR

Average water level

ETARMS

Root-mean-squared water level

ETAMAX

Maximum water-surface elevation

ETASD

Standard deviation of water level

RHOHH

Correlation between wave heights

RHOHT

Correlation between heights and periods

HMIN

Smallest wave height

HMAX

Largest wave height

HBAR

Average wave height

H 1/3

Significant wave height, average of highest 33 percent of

wave heights

H 1/10

Average of highest 10 percent of wave heights

H 1/20

Average of highest 5 percent of wave heights

H 1/100

Average of highest 1 percent of wave heights

TBAR

Average wave period

T 1/3

Significant wave period, average period of highest 33 percent

of waves

T 1/10

Average wave period of highest 10 percent of wave heights

T 1/20

Average wave period of highest 5 percent of wave heights

T 1/100

Average wave period of highest 1 percent of wave heights

For Rayleigh distribution of wave heights, alpha = 2 and beta

WEIBULL ALPHA

= 0.5. Truncation of higher wave heights by breaking

WEIBULL BETA

increases alpha.

NO. OF WAVES

Number of waves in record.

H (P=0.5)

Median wave height (exceeded 50 percent)

T (P=0.5)

Median wave period (exceeded 50 percent)

21

Chapter 3 Measurement Procedures and Data Analysis

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