Hydrodyamic Efficiency of Double Pontoon Supported on Piles.

Document Type : Research Studies

Authors

1 Irrigation and Hydraulics Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

2 Irrigation and Hydraulics Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Abstract

The efficiency of a double fixed pontoon supported on two rows of piles was examined experimentally under regular waves. The breakwater efficiency is presented as a function of transmission, reflection, and energy loss coefficients. Regular waves with wide ranges of wave heights and periods with constant water depth were used. Different parameters of double fixed pontoon and supporting pile systems were also tested. It was found that the transmission coefficient, Kt, decreases with the increasing value of the relative breakwater draft, did, and with the decreasing values of both the relative gap between two pontoons, al b, and the pile gap-diameter ratio, G/D. Pile system improves the efficiency of double Pontoon by about (7-16) % when G/D = 0.5 and al b = 1.0. The usage of pile system with a double fixed pontoon is more effective in case of small gaps between piles. It is possible to achieve Kt values less than 0.25 when did = 0.30, a/b = 1.0, and G/D = 0.50. Simple empirical equations were developed for estimating both the wave transmission and reflection coefficients by using non-linear regression analysis. In addition, the proposed breakwater model gives a reasonable efficiency compared with other pontoon types. 

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