Open AccessLABORATORY STUDY ON PERVIOUS CORE BREAKWATERS
Author(s) -
Hideo Kondo,
Satoshi Tōma,
Kenji Yano
Publication year - 1976
Publication title -
proceedings of conference on coastal engineering/proceedings of ... conference on coastal engineering
Language(s) - English
Resource type - Journals
eISSN - 2156-1028
pISSN - 0589-087X
DOI - 10.9753/icce.v15.151
Subject(s) - breakwater , core (optical fiber) , armour , reflection (computer programming) , geology , geotechnical engineering , materials science , mechanics , layer (electronics) , physics , composite material , computer science , programming language
Effects of permeable core layer installed in trapezoidal and rectangular breakwaters have been studied experimentally and analytically. As the materials for armour and core use of the lattice composed of circular cylinders was made in addition to rocks. Perforated plates were also applied as a kind of very thin core. Expermental results show that the reflected wave heights from breakwater could be reduced considerably by locating the core layer shoreward within it while core thickness controls the transmitted wave heights in the protected water area. Harmonic analysis about the water surface in lattice armour reveals that the second harmonic waves take a pattern of standing wave distribution having a node at the seaward face of breakwater. Thin perforated plates work success-- fully for reducing the transmitted wave heights when they are installed at the rear face of breakwater. An analytical approach to predict the transmission and the reflection coefficients is applied for the present experimental data and shown to be useful.