{"refrec":{"BRefID":248887,"RR":"<b>Rustell, M.</b> (2015). Breakwater layout optimisation using a root-finding algorithm, <b><i>in</i></b>: <i>PIANC Yearbook 2014.</i> pp. 110-120","BEntID":240592,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in</i></b>: <i>PIANC Yearbook 2014.</i> pp. 110-120","DocTypID":17,"DocType":"Book chapters","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Rustell, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Rustell, M.","Englishabstract":"Due to the remote and exposed coastal location  of many proposed liquefied natural gas (LNG) exportation terminals, a breakwater is often required  to reduce the wave energy at the vessel berth(s).  Best practice and new research techniques for developing the cross section and sizing armour stone  concepts are well established however, little research exists for developing topographical layouts.  This paper describes a methodology which can be  used to develop breakwater layouts, optimal for the  vessels berthed in the shadow zone. This is achieved  on the premise that for any given level of accept- able berth downtime, there exists a corresponding  breakwater design. This premise allows the relation- ship to be expressed as downtime = f(length) which  can be solved through an iterative approach. To  achieve this, a random wave transformation model  and a dynamic mooring analysis model have been  embedded in an iterative root finding algorithm to  transform the waves to, through and around the  breakwater. The diffracted and transmitted wave energies are summed using the root mean square  (RMS) approach before the ‘effective wave’ is used  to determine whether the vessel mooring threshold is exceeded. Performing this for a time series gives an  indication of the downtime that will be incurred with  this breakwater layout, which is used to iteratively  search for the breakwater length which offers the  desired level of downtime. This methodology is applied to a rubble-mound breakwater, though could  easily be transposed to a berm, caisson or any other  kind. A case study is used to demonstrate the effectiveness of this methodology in developing accurate  breakwater layouts in a very short time frame, allowing a greater variety of berth positions and arrangements to be trialled during the conceptual design stage.","AbstractOtherLang":null,"BibLvlCode":"AM","StandardTitle":"Breakwater layout optimisation using a root-finding algorithm","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Wave transformation; Concept design; Root-finding","OtherDescriptors":null,"Notes":null,"AnaPub":2015,"MonPub":null,"DateUpdate":"2015-07-14","DateCreate":"2015-07-14","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":0,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":248887,"PubliDate":2015,"Pagination":"110-120","XtraPublOfAnaID":null,"ISBN":"978-2-87223-225-3","Volume":null,"Issue":null,"BRefMon":248885,"BRefMonRR":"(2015). 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