UNCERTAINTY PARAMETERS OF THE MEASURED AND CALCULATED WAVE FORCES ON THE PERFORATED CAISSON BREAKWATER

Title
UNCERTAINTY PARAMETERS OF THE MEASURED AND CALCULATED WAVE FORCES ON THE PERFORATED CAISSON BREAKWATER
Author(s)
김승우; 오상호; 지창환
Publication Year
2016-05-11
Abstract
The purpose of this study is to analyze the uncertainty of the wave forces on the perforated caisson breakwater. Understanding the uncertainty of the wave force enables the caisson breakwater to be designed reasonably and economically. Theprobabilistic design methods, such as the reliability-based design method or the performance-based design method that are based on the reliability principles of ISO 2394 and ISO 21650, are becoming a global design standard. In this study, the uncertainty parameters of perforated caisson breakwaters were evaluated by using the normal and the log-normal distributions. The representative parameters evaluating the uncertainty of the wave forces are the bias and the coefficient of variation for the normal distribution and the scale and location parameters for the log-normal distribution. For the narrow chamber case (Group 1), most of the wave forces followed the normal distribution except for the wave force acting on the slit part at the crest I. The bias in Group 1 was widely distributed from -39 % to 79 % depending on the wave phase and the wave force. For the wide chamber case (Group 2), all the wave forces followed the log-normal distribution, but the uncertainty parameters of the log-normal distribution cannot directly be applied in the design process. The bias in Group 2 was also widely distributed between -55 % and 14 %.robabilistic design methods, such as the reliability-based design method or the performance-based design method that are based on the reliability principles of ISO 2394 and ISO 21650, are becoming a global design standard. In this study, the uncertainty parameters of perforated caisson breakwaters were evaluated by using the normal and the log-normal distributions. The representative parameters evaluating the uncertainty of the wave forces are the bias and the coefficient of variation for the normal distribution and the scale and location parameters for the log-normal distribution. For the narrow chamber case (Group 1), most of the wave forces followed the normal distribution except for the wave force acting on the slit part at the crest I. The bias in Group 1 was widely distributed from -39 % to 79 % depending on the wave phase and the wave force. For the wide chamber case (Group 2), all the wave forces followed the log-normal distribution, but the uncertainty parameters of the log-normal distribution cannot directly be applied in the design process. The bias in Group 2 was also widely distributed between -55 % and 14 %.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24826
Bibliographic Citation
6th International Conference on the Application of Physical Modelling in Coastal and Port Engineering and Science (Coastlab16), pp.1 - 8, 2016
Publisher
University
Type
Conference
Language
English
Publisher
University
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