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http://dx.doi.org/10.9765/KSCOE.2013.25.3.138

Development of a Stability Formula for Tetrapod by Using M5' Model Tree  

Kim, Seung-Woo (Coastal and Hydraulics Laboratory, US Army Engineer Research and Development Center (US Army ERDC))
Suh, Kyung-Duck (Department of Civil and Environmental Engineering & Engineering Research Institute, Seoul National University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.25, no.3, 2013 , pp. 138-146 More about this Journal
Abstract
Tetrapod, one of the famous armor blocks for rubble mound breakwaters, has been widely used in the world. In order to evaluate the required weight of Tetrapod, many researchers have proposed various stability formulas. Since the stability formulas were proposed by curve-fitting the experimental data, some uncertainties are included in the formulas. The main uncertainties are associated with experimental data, derivation of the formula, and variability of the design variables. In this study, a new stability formula is developed by using M5' model tree, which reduces the uncertainty in the derivation of the formula. The index of agreement is used to evaluate the performance of the developed formula. The index of agreement for the new formula is higher by about 0.1 than the previous formula. The performance of the previous formula was not good when the predicted stability number is greater than about 3.0. However. the new formula is accurate regardless of the magnitude of stability number. As a result, the new formula performs better than the previous formula, while expressed in the form of a tree but still in an explicit form.
Keywords
Tetrapod; M5' model tree; stability formula; index of agreement;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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