Long Term Wave Analysis Quiz

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the common variables of the wave climate?

Surface currents and mean sea level

Significant Wave height (Hs) and Peak-mean period (Tp-Tm) (correct)

Wind velocity and wind direction

Sea state parameters time series (Hmo, Tp, etc.)

What does the symbol Hm0 represent in the context of wave analysis?

Significant wave height (correct)

Mean wave period

Wave spectrum

Wave direction

What are the components of the wave climate system?

Wind velocity, wind direction, wave height, mean period, wave direction, tide, mean sea level, surface currents

Mean and extreme climate conditions

Atmosphere, hydrosphere, cryosphere, land surface, and biosphere (correct)

Sea state parameters time series (Hmo, Tp, etc.)

What is AMEVA used for in the context of wave climate representation?

Software to represent wave climate Signup and view all the answers

What are the long-term prevalent wave conditions of a region also known as?

Characteristic state of the wave system Signup and view all the answers

What are the variables of the long-term wave analysis system?

Wind velocity, wind direction, wave height, mean period, wave direction, tide, mean sea level, surface currents Signup and view all the answers

What is the record of the sea surface vertical displacement represented as in wave analysis?

PDF wave height P(H) Signup and view all the answers

What does wave climate system encompass?

Characteristics, variability, and parameters of wave climate Signup and view all the answers

What is involved in determining the annual statistical distribution of significant wave height (Hs)?

Ordering time series data, assigning probabilities, and fitting theoretical distributions Signup and view all the answers

Which distributions are commonly used for fitting long-term Hs distribution?

Weibull and Lognormal Signup and view all the answers

What does extreme value analysis focus on?

Extreme events like storms Signup and view all the answers

What does the return period concept allow quantifying?

The probability of an event Signup and view all the answers

How does extreme value analysis benefit coastal management and maritime works?

Assessing flooding risk and designing structures to withstand extreme events Signup and view all the answers

Why is analyzing the duration of storms crucial in extreme value analysis?

Considering the different coast locations and periods of meteorological disturbances Signup and view all the answers

What is the average annual probability of a 100-year return period event?

1% Signup and view all the answers

What does the Generalized Extreme Value distribution combine parameters from?

Weibull, Gumbel, and Frechet distributions Signup and view all the answers

What is the probability of non-exceedance of a 100-year return period event in 100 consecutive years?

Approximately 36.6% Signup and view all the answers

What does the Generalized Extremes function (GEV) combine from extreme value theory?

Gumbel, Fréchet, and Weibull distributions Signup and view all the answers

What is the dimensionless variable in the GEV function?

$T(H_{so}) = 1 / (1 - F_R T(H_{so}))$ Signup and view all the answers

What parameters are involved in the distribution function of the GEV?

Location, scale, and shape Signup and view all the answers

What is the GEV function crucial for understanding?

The likelihood and impact of extreme wave events over time Signup and view all the answers

What is the range of the PDF for the Gumbel distribution?

$-rac{1}{6} < x < rac{1}{6}$ Signup and view all the answers

What is the mean of the Gumbel distribution?

$0$ Signup and view all the answers

What is the CDF for the Weibull (3par) distribution?

$F(x) = 1 - e^{-(x - 0.5772)^3}$ Signup and view all the answers

What is the range of the PDF for the Weibull (3par) distribution?

$x < 0$ Signup and view all the answers

What is the mean of the Weibull (3par) distribution?

Undefined Signup and view all the answers

What is the PDF for the extreme wave distribution FT-III?

$f(H_s) = e^{-A(H_s)}$ Signup and view all the answers

What is the CDF for the extreme wave distribution FT-III?

$F(H_s) = 1 - e^{-A(H_s)}$ Signup and view all the answers

For which value of $x$ is the GEV undefined?

$x = 0$ Signup and view all the answers

In the first case, at the lower end, what is the value of the GEV?

$0$ Signup and view all the answers

In the second case, at the upper limit, what is the value of the GEV?

$1$ Signup and view all the answers

What are the common variables of the wave climate system?

Significant Wave height (Hs), Peak-mean period (Tp-Tm) Signup and view all the answers

What does the Generalized Extremes function (GEV) combine from extreme value theory?

Location parameter, scale parameter, shape parameter Signup and view all the answers

What are the variables of the long-term wave analysis system?

Wind velocity, wind direction, wave height, mean period, wave direction, tide, mean sea level, surface currents Signup and view all the answers

What are the most commonly used distributions for fitting long-term Hs distribution in wave climate system?

Weibull and Lognormal Signup and view all the answers

What does extreme value analysis focus on in the context of wave climate system?

Extreme events like storms Signup and view all the answers

What does the return period concept in extreme value analysis allow quantifying?

The probability of an event based on the average time between independent events Signup and view all the answers

What is the Generalized Extreme Value (GEV) distribution used to calculate?

The return period and probability of failure for extreme wave events Signup and view all the answers

What does the return period concept allow quantifying?

The probability of overcoming a 100-year return period event in 100 years Signup and view all the answers

What is the probability of non-exceedance of a 100-year return period event in 100 consecutive years?

36.6% Signup and view all the answers

What is the range of the PDF for the Gumbel distribution?

$-rac{1}{x} < y < rac{1}{x} + 6$ Signup and view all the answers

What is the CDF for the Weibull (3par) distribution?

$F(x; q) = e^{-(1 - x^{1/q})}$ Signup and view all the answers

For which value of $x$ is the GEV undefined?

$x = 0$ Signup and view all the answers

What does the symbol $H_s$ represent in the context of wave analysis?

Significant wave height Signup and view all the answers

What is the probability of non-exceedance of a 100-year return period event in 100 consecutive years?

63.4% Signup and view all the answers

What is involved in determining the annual statistical distribution of significant wave height (Hs)?

Both extreme value analysis and wave period analysis Signup and view all the answers

What is the value of the Generalized Extreme Value (GEV) distribution for $x < 0$?

It is undefined Signup and view all the answers

What is the range of the Probability Density Function (PDF) for the Gumbel distribution?

$(-6, \infty)$ Signup and view all the answers

What is the Cumulative Distribution Function (CDF) for the Weibull (3par) distribution?

$F(x;q) = 1 - e^{-(x + 0.5772)^q}$ Signup and view all the answers

What does the symbol $H_{m0}$ represent in the context of wave analysis?

Significant wave height Signup and view all the answers

What is AMEVA used for in the context of wave climate representation?

Representing long-term wave distributions Signup and view all the answers

What are the common variables of the wave climate system?

Wave height, mean period, wave direction Signup and view all the answers

What are the variables of the long-term wave analysis system?

Wave height, mean period, wave direction Signup and view all the answers

What is the range of the Probability Density Function (PDF) for the Gumbel distribution?

(-∞, ∞) Signup and view all the answers

What is the Cumulative Distribution Function (CDF) for the Weibull (3par) distribution?

1 - e^{-(x/eta)^{ heta}} Signup and view all the answers

What does the Generalized Extremes function (GEV) combine from extreme value theory?

Gumbel, Weibull, Frechet distributions Signup and view all the answers

What is the valid GEV for $x < 0$?

$\neq -1$ Signup and view all the answers

For $x > 0$, what is the value of the GEV at the lower end?

0 Signup and view all the answers

For $x = 0$, what happens to the GEV?

It is undefined Signup and view all the answers

What is the mean of the Gumbel distribution?

$1$ Signup and view all the answers

What is the range of the PDF for the Weibull (3par) distribution?

$-6 < x < \infty$ Signup and view all the answers

What is the CDF for the extreme wave distribution FT-III?

$F(H_s) = e^{-Ae^{-B H_s}}$ Signup and view all the answers

What is the value of the Generalized Extreme Value (GEV) distribution for $x < 0$?

$\neq -1$ Signup and view all the answers

What is the probability of non-exceedance of a 100-year return period event in 100 consecutive years?

63.4% Signup and view all the answers

What is the value of the GEV at the upper limit for the second case?

Undefined Signup and view all the answers

What is the probability of overcoming a 100-year return period event in 100 years?

63.4% Signup and view all the answers

What does the lifetime probability of failure, $PFV$, represent?

1 - FRT(Hso)V Signup and view all the answers

What does the return period of a parameter X represent?

The average time between two exceedances of X Signup and view all the answers

What does the Generalized Extreme Value (GEV) distribution combine parameters from?

The Gumbel, Fréchet, and Weibull distributions Signup and view all the answers

What is the inverse of the return period?

The annual probability of the event being exceeded Signup and view all the answers

What is the probability of non-exceedance for 100 consecutive years of an event with a 100-year return period?

36.6% Signup and view all the answers

What is the Generalized Extremes function (GEV) a family of?

Continuous probability distribution functions Signup and view all the answers

What is the purpose of the return period concept in extreme value analysis?

To quantify the probability of an event of a certain magnitude being equaled or exceeded Signup and view all the answers

What is the most commonly used distribution for fitting long-term significant wave height (Hs) distribution in the wave climate system?

Weibull (3 par.) Signup and view all the answers

What does the Generalized Extreme Value (GEV) distribution combine parameters from?

Extreme value theory Signup and view all the answers

What is the range of the Probability Density Function (PDF) for the Gumbel distribution?

$(-rac{2}{B}, +rac{2}{B})$ Signup and view all the answers

What is the Cumulative Distribution Function (CDF) for the Weibull (3 par.) distribution?

$F(Hs) = 1 - e^{-(rac{Hs}{B})^C}$ Signup and view all the answers

Why is it necessary to perform a special analysis for extreme events in the wave climate system?

To understand the behavior of very intense and severe events Signup and view all the answers

What is the value of the Generalized Extreme Value (GEV) distribution for $x < 0$?

Undefined Signup and view all the answers

What are the most commonly used distributions for fitting long-term wave distribution in wave climate system?

Weibull and Lognormal Signup and view all the answers

What does the concept of return period quantify?

The average time between independent events Signup and view all the answers

What does extreme value analysis aid in assessing for coastal management?

Flooding risks Signup and view all the answers

What is crucial for assessing extreme events and return periods in wave climate system?

Extreme value analysis Signup and view all the answers

What is illustrated with an example of significant wave height (Hs) and its exceedance probability over a certain time interval?

The concept of return period Signup and view all the answers

What is used to determine statistical distribution of sea state parameters over a period of time in the wave climate system?

Long term distributions Signup and view all the answers

What is necessary to define and analyze in extreme value analysis, which can vary based on coastal locations and meteorological disturbances?

The occurrence and duration of storms Signup and view all the answers

Study Notes

Extreme Value Analysis and Return Period

The return period is the average time between two exceedances of a certain event, with a 100-year return period having an average annual probability of 1%.
Extreme value analysis involves determining the extreme value distribution of events, such as storm surges, over time.
The Generalized Extreme Value distribution is a probabilistic function that combines parameters from various distribution functions like Weibull, Gumbel, and Frechet.
The probability of non-exceedance of a 100-year return period event in 100 consecutive years is approximately 36.6%, meaning the probability of occurrence is 63.4%.
The scalar and directional annual extreme distribution of a parameter, like storm surge heights, involves assigning probabilities to annual maximum values and analyzing the probability of non-exceedance over a certain period.
The return period concept is related to the probability of each year, and it is used to calculate the probability of overcoming a 100-year return period event in 100 years.
The failure of a marine structure is associated with the exceedance of a certain value of a sea state parameter, and the probability of failure can be calculated using the extreme annual scalar distribution and the Cumulative Distribution Function.
The lifetime probability of failure for a marine structure can be calculated using the relationship between the annual extreme distribution of a parameter, the lifespan, and the probability of failure.
The Generalized Extremes function (GEV) is a family of continuous probability distribution functions developed by extreme value theory, combining Gumbel, Fréchet, and Weibull distributions.
The GEV function is determined by the dimensionless variable T(Hso) = 1 / (1 – FRT(Hso)), where Hso is the calculation value of the sea state parameter.
The distribution function of the GEV involves parameters like location, scale, and shape, and is used to calculate the return period and probability of failure for extreme wave events.
The GEV function is used to determine the return period and probability of failure for extreme wave events, and it is crucial for understanding the likelihood and impact of these events over time.

Extreme Value Analysis and Return Period

The return period is the average time between two exceedances of a certain event, with a 100-year return period having an average annual probability of 1%.
Extreme value analysis involves determining the extreme value distribution of events, such as storm surges, over time.
The Generalized Extreme Value distribution is a probabilistic function that combines parameters from various distribution functions like Weibull, Gumbel, and Frechet.
The probability of non-exceedance of a 100-year return period event in 100 consecutive years is approximately 36.6%, meaning the probability of occurrence is 63.4%.
The scalar and directional annual extreme distribution of a parameter, like storm surge heights, involves assigning probabilities to annual maximum values and analyzing the probability of non-exceedance over a certain period.
The return period concept is related to the probability of each year, and it is used to calculate the probability of overcoming a 100-year return period event in 100 years.
The failure of a marine structure is associated with the exceedance of a certain value of a sea state parameter, and the probability of failure can be calculated using the extreme annual scalar distribution and the Cumulative Distribution Function.
The lifetime probability of failure for a marine structure can be calculated using the relationship between the annual extreme distribution of a parameter, the lifespan, and the probability of failure.
The Generalized Extremes function (GEV) is a family of continuous probability distribution functions developed by extreme value theory, combining Gumbel, Fréchet, and Weibull distributions.
The GEV function is determined by the dimensionless variable T(Hso) = 1 / (1 – FRT(Hso)), where Hso is the calculation value of the sea state parameter.
The distribution function of the GEV involves parameters like location, scale, and shape, and is used to calculate the return period and probability of failure for extreme wave events.
The GEV function is used to determine the return period and probability of failure for extreme wave events, and it is crucial for understanding the likelihood and impact of these events over time.

Extreme Value Analysis and Return Period Concept

Return period is the average time between two exceedances of an event and its inverse is the annual probability of the event being exceeded.
For independent events, the joint probability of occurrence is the product of individual probabilities.
The Generalized Extreme Value distribution is a probabilistic function that combines parameters from various distribution functions.
The probability of non-exceedance for 100 consecutive years of an event with a 100-year return period is 36.6%.
The scalar and directional annual extreme distribution of significant wave height (Hs) involves selecting N annual maximum values and assigning probabilities to each.
On average, a storm surge event larger than 120 cm occurs every 100 years.
The probability of overcoming a 100-year return period event in 100 years is 63.4%.
The failure probability of a marine structure is associated with the exceedance of a certain value of a sea state parameter.
The return period of a parameter X is the average time between two exceedances of X, and its probability of exceedance in a year is 1 - FRT(X).
The lifetime probability of failure, PFV, is calculated as 1- FRT(Hso)V, where Hso is the calculation value.
The Generalized Extremes function (GEV) is a family of continuous probability distribution functions that combines the Gumbel, Fréchet, and Weibull distributions.
The distribution function of the GEV involves location, scale, and shape parameters and can be used to calculate return periods and failure probabilities for extreme wave distributions.

Wave Climate System and Extreme Value Analysis

Wave climate system encompasses characteristics, variability, and statistical distribution of wave parameters such as wave direction, mean wave energy flux, and significant wave height (Hs).
Long term distributions are used to determine statistical distribution of sea state parameters over a period of time, such as the annual mean distribution of Hs.
The most commonly used distributions for fitting long term wave distribution are Weibull and Lognormal, represented by probability density function (PDF) and cumulative distribution function (CDF).
Other representations used for wave climate include mean range, color-coded relative frequency, and percentiles.
Extreme value analysis is crucial for assessing extreme events and return periods, which quantifies the probability of an event being equaled or exceeded in a certain time interval.
Return period concept allows quantifying the probability of an event, with the average time between independent events referred to as the "return period".
For extreme value analysis, it is necessary to define the threshold and analyze the occurrence and duration of storms, which can vary based on coastal locations and meteorological disturbances.
The concept of return period is illustrated with an example of significant wave height (Hs) and its exceedance probability over a certain time interval.
Extreme value analysis aids in coastal management, particularly in assessing flooding risks and designing maritime works to withstand extreme events.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge of Extreme Value Analysis and Return Period with this quiz. Explore concepts such as the Generalized Extreme Value distribution, probability of non-exceedance, and the application of extreme value theory to marine structures and wave events.