{"refrec":{"BRefID":128663,"RR":"<b>Van der Meulen, T.; Vinjé, J.J.</b> (1977). Three-dimensional local scour in non-cohesive sediments. <i>Publication. Delft Hydraulics Laboratory = Publikatie - Waterloopkundig Laboratorium</i>, 180. Delft Hydraulics Laboratory: Delft. 12 pp.","BEntID":122566,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Publication. Delft Hydraulics Laboratory = Publikatie - Waterloopkundig Laboratorium</i>, 180. Delft Hydraulics Laboratory: Delft.  12 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Van der Meulen, T.; Vinjé, J.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Van der Meulen, T.; Vinjé, J.J.","Englishabstract":"The results are described of systematic research for three-dimensional local scour in loose sediments. Relationships were determined between time-scale and scales for velocity, length and material density. As for two-dimensional flow the shape and the extent of the scour-hole due to vortices are in a high degree time dependent; originally the development as a function of time is very fast, but in a later phase the progress is slower until eventually an equilibrium situation is reached. In many practical cases the equilibrium will not be attained.<br>Geometry, dam-height, length and roughness of bottom protection, flow velocity and density of sediments were varied.<br>A relationship for the time-scale was derived. somewhat similar to that for two-dimensional scour.<br> For practical cases the scour has to be determined for a number of longitudinal sections which have each a different time-scale. Restrictions of the results like permanent flow and neglect ion of upstream material supply can be tackled with additional computation methods.","AbstractOtherLang":null,"BibLvlCode":"MS","StandardTitle":"Three-dimensional local scour in non-cohesive sediments","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":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1977,"DateUpdate":"2020-06-30","DateCreate":"2009-01-21","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":128663,"ISBN":null,"PubliDate":1977,"IssueDate":null,"Volume":"180","Issue":null,"Pagination":"12","Place":"Delft","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":44708,"SerRR":"Publication. 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