DESIGN OF RUBBLE-MOUND BREAKWATER: INTRODUCING A FORMULA FOR THE PERMEABILITY

Alireza Jafari, Amir Etemad-Shahidi

Abstract


Determining the optimum weight of the armour blocks is the most important issue in designing the break water. Existing empirical formula, such as those of Hudson (1958) and Van der Meer (1988), depict considerable scatter between the predicted stability number and the measurements. This scatter imposes higher safety factor and increases the construction costs (Kim and Park, 2005). Numerous researchers put efforts in this issue to increase the accuracy of the prediction by using different mathematical models (i.e., Mase et al., 1995; Kim and Park, 2005; Erdik, 2009; Etemad-Shahidi and Bonakdar, 2009; Etemad-Shahidi and Bali, 2012). However, the proper definition for the permeability parameter of the rubble-mound coastal structures is yet missing. In this paper, a semi-empirical model for permeability parameter is introduced and improvements in designing of the rubble-mound breakwater is presented.

Keywords


Rubble-mound; Breakwater; Permeability; irregular wave

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References


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Etemad-Shahidi, A. and Bali, M., (2012). Stability of rubble-mound breakwater using< i> H< sub> 50 wave height parameter. Coastal Engineering, 59(1): 38-45.

Etemad-Shahidi, A. and Bonakdar, L., (2009). Design of rubble-mound breakwaters using M5′ machine learning method. Applied Ocean Research, 31(3): 197-201.

Hudson, R., (1958). Design of Quarry-Stone Cover Layers for Rubble-Mound Breakwaters, DTIC Document.

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Van der Meer, J.W., (1988). Rock slopes and gravel beaches under wave attack.

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DOI: https://doi.org/10.9753/icce.v34.posters.34