Analysis of [pi]-type floating breakwater in oblique waves
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Gesraha, Mohamed M. R.
issued: 2009-05-23T19:29:31Z
issued: 1998
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The present study investigates the diffraction problem of waves interacting with a long rectangular breakwater with two side plates, for brevity it will be referred to as pi-type. The effect of the addition of two side-boards on the performance of a rectangular breakwater is the main aim of this study. The structure is assumed to be placed in water of uniform constant depth, and an eigenfunction expansion method was used in the solution. The fluid is assumed inviscid, and the flow irrotational, so that a velocity potential may be used to describe the flow. The exciting forces, added masses, damping coefficients, responses of the structure, and the transmission coefficient were all calculated for different cases and their results were analyzed. Different waves approaching the breakwater from any direction are considered. Comparisons between the present approach and different numerical solutions published previously were used to verify the developed numerical model. Other comparisons between the traditional rectangular breakwater and the proposed pi-type breakwater are also performed. The present solution proved to be a fast accurate method as compared to other methods. The present study showed that maximum wave forces and heave response occur for the normal wave incidence, but the surge and pitch responses are not maximum for normal waves and different directions then need to be considered. The proposed breakwater experiences lower exciting forces when compared to a rectangular one having the same under-tip clearance, thus savings of materials and cost are achieved by using this type, provided its good performance with respect to wave transmission is assumed. The numerical results showed good agreement with the measured transmission coefficient for both the fixed structure and freely floating structure cases.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/8101
extent: 3387570 bytes
format: application/pdf
note: ANALYSIS OF EL-TYPE FLOATING B R E A K W A T E R IN OBLIQUE WAVES by M O H A M E D M . R. G E S R A H A B . Sc., Cairo University-Fayoum Campus, 1990 M . Sc., Cairo University, 1995 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS OF THE DEGREE OF MASTER OF APPLIED SCIENCE i n F A C U L T Y OF G R A D U A T E STUDIES Department of Civil Engineering We accept this thesis as conforming to the required standard THE UNIVERSITY OF BRITISH COLUMBIA JULY 1998 © M O H A M E D M . GESRAHA, 1998 In presenting this thesis in partial fulfillment of the requirement for an advanced degree. at THE UNIVERSITY OF BRITISH C O L U M B I A , I agree that the library shall make it free available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purpose may be granted by the head of my department or by his or her representatives. It is also understood that copying for financial gain or publication of this thesis shall not be allowed without my written permission. Department of Civi l Engineering THE UNIVERSITY OF BRITISH C O L U M B I A 2324 M A I N M A L L V A N C O U V E R , B C V6T 1Z4 C A N A D A Date : June 1998 A B S T R A C T The present study investigates the diffraction problem of waves interacting with a long rectangular breakwater with two side plates, for brevity it wil l be referred to as pi-type. The effect of the addition of two side-boards on the performance of a rectangular breakwater is the main aim of this study. The structure is assumed to be placed in water of uniform constant depth, and an eigenfunction expansion method was used in the solution. The fluid is assumed inviscid, and the flow irrotational, so that a velocity potential may be used to describe the flow. The exciting forces, added masses, damping coefficients, responses of the structure, and the transmission coefficient were all calculated for different cases and their results were analyzed. Different waves approaching the breakwater fr…
has type: Thesis/Dissertation
date issued: 1998-11
is shown at: 10.14288/1.0050153
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/8101