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Wave statistics
Wave statistics
15 terms
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StudBud Administration
A quiz reviewing concepts in Random waves time domain analysis Short term and Long term statisitics
Flashcards
15 cards
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Questions
15
Answers
1
For a Gaussian distributed process, like the irregular waves. The individual maxima follows:
Weibull distribution
Rayleigh distribution
Normal distribution
Gumbel distribution
2
Probability density function
(pdf)
describes the relative likelihood for a random variable to take on a given value.
False
True
3
What is the wave period that corresponds to max wave energy?
Spectral peak period
Mean zero-upcrossing period
Mean zero-downcrossing period
4
In short term wave statistics, it is assumed that a sea-state is constant typically over:
3 hours
4 hours
2 hours
1 hour
5
Cumulative distribution function (cdf) state the probability that a random variable will be larger than a given value
False
True
6
Probability of exceedance of wave height (h):
Probability of wave height at least (h)
Probability of a higher wave
the inverse of the CDF {F(h)}
the CDF {F(h)}
7
How long record length of data is recommended to give a statistically acceptable value of the return period value?
25% of the return period
10% of the return period
1% of the return period
50% of the return period
8
A storm with a return period of 50 years has a probability of occurance in a given year equal to
50%
2%
5%
20%
9
Sea state parameters are (Hs & Tz). Which are correct?
mean wave height and mean wave period
Significant wave height and zero-up-crossing mean period
significant wave height and spectral peak period
10
What are T1, T2, and T3?
Zero upcrossing periods
Spectral peak periods, Tp
Zero downcrossing periods
11
What are T1, T2, and T3?
Zero downcrossing periods
Spectral peak periods, Tp
Zero upcrossing periods
12
In short term wave statistics (H) follows a:
Rayleigh distribution
Lognormal distribution
Normal distrubution
Gumbel distribution
13
Basic principle of irregular random wave?
regular wave with changing amplitude
regular wave with changing frequency
sum of different regular waves
14
The combined effect of meteorology (study of atmosphere) and oceanography (study of ocean)
Omnidirectional
Seasonal analysis
MetOcean
15
The sea-state is assumed to be a weekly stationary process. What does this mean?
Mean and StDev of elevation are constant (at a given point)
Mean and StDev of elevation are variable (at a given point)
