Wave Reflection and Transmission for Pile Arrays

Abstract

A group of piles in a specific geometric pattern may represent a part of a foundation supported by multiple pilings or a porous sea wall or other type of porous coastal structure. "Wave characteristics" of such a structure will include not only the wave transmission but also wave reflection characteristics. Most of the experiments in the past on pile groups were mainly concerned with wave transmission characteristics as a function of wave height and period. The main purpose of these previous studies was to evaluate the absorption characteristics of pile groups, and wave reflections were generally not measured, or evaluated. Variables in this study included wave characteristics such as wave height and length and three types of symmetric pile arrays, two providing clear spacing in the direction of the wave between pile rows and one with a staggered arrangement. The results presented in dimensionless form show the effect of pile geometry and wave steepness on the coefficient of reflection and transmissibility.

Laboratory Investigation on Wave Reflection Characteristics of Suspended Perforated Pipe Breakwater

“…2 to Fig. 7 a clear increasing trend of Kr with increase in Hi I gT 2 is seen, irrespective of h, y/h, D and p. This confirms the findings of other researchers like Van Weele & Herbich (1972), Mani & Pranesh (1986), Sathyanarayana et al (1996), Subba Rao et al (1997) and Giridhar (1998). Hence it can be concluded that Kr increases as Hi I gT 2 increases for all the cases of pipes considered.…”

“…Pile breakwaters consisting of closely spaced vertical piles in a row has been shown lobe effective in allenuating wave energy by Hayashi et al ( 1968), Hutchinson and Raudkivi ( 1984), Mani and Pranesh ( 1986), Subba Rao et al ( 1997) and Van Weele and Herbich ( 1972).…”

Experimental Investigation of the Hydraulic Performance of Caisson-Pile Breakwaters

“…Because Van Weele and Herbich (1972) suggested that the mutual interaction among the piles can be ignored at spacings larger than twice the pile diameter, spacings greater than twice the caisson-pile thickness are not considered here.…”