{"refrec":{"BRefID":404652,"RR":"<b>Brouwer, R.L.; Schramkowski, G.</b> (2024). Geïdealiseerde processtudie van systeemovergangen naar hypertroebelheid: WP 6.1 Tijdsintegrator. Versie 4.0. <i>WL Rapporten</i>, 13_103_15. Waterbouwkundig Laboratorium: Antwerpen. VIII, 21 + 4 p. bijl. pp.","BEntID":402445,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". Versie 4.0. <i>WL Rapporten</i>, 13_103_15. Waterbouwkundig Laboratorium: Antwerpen.  VIII, 21 + 4 p. bijl. pp.","DocTypID":13,"DocType":"Reports","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Brouwer, R.L.; Schramkowski, G.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Brouwer, R.L.; Schramkowski, G.","Englishabstract":null,"AbstractOtherLang":"Dit rapport geeft een technische beschrijving van de tijdsintegrator die binnen het geïdealiseerde model i-Flow de subtidale sedimentevolutie uitrekent in een getijgedomineerd estuarium. Hiermee kan bijvoorbeeld de respons van een systeem op variabele rivierafvoer worden onderzocht. De tijdsintegrator berekent het tijdsgedrag van de hoeveelheid sediment, zowel in suspensie als op de bodem. Hierbij wordt de opwerveling beschreven door gebruik te maken van een dynamische erodeerbaarheidsfunctie.<br>&nbsp;De ruimtelijke discretisatie geschiedt aan de hand van tweede-orde upwind en downwind (backward) schematisaties. Voor de tijdsintegratie kunnen een forward Euler schema (expliciet) of een Crank-Nicholson (CN) dan wel backward Euler (BE) Schema (beiden impliciet) worden gebruikt. In de praktijk zijn tot dusverre enkel CN en BE gebruikt aangezien deze impliciete schema’s betere stabiliteitseigenschappen hebben.<br>De performatie van CN en BE wordt onderzocht in functie van tijdstap en fijnmazigheid van het rekengrid. Hiervoor wordt in eerste instantie het geïdealiseerde Scheldemodel met constante rivierafvoer beschouwd. Zoals verwacht vertoont het CN-schema tweede orde convergentie bij afnemende tijdstap. Omdat CN echter niet L-stabiel is treden bij grotere tijdstappen temporele oscillaties op die slechts langzaam uitdempen. Het BE-schema geeft een eerste orde nauwkeurigheid bij afnemende tijdstap, maar geeft ook bij grotere tijdstappen nog goede resultaten omdat het schema L-stabiel is. Zowel CN als BE laten bij benadering een kwadratische convergentie zien bij afnemende ruimtestap.<br>Tot slot worden CN en BE ook kort vergeleken voor het Scheldemodel met variabele rivierafvoer, gebaseerd op dagwaarden te Melle voor het jaar 2009. Hieruit blijkt dat BE bij sterk fluctuerende afvoeren betere resultaten geeft dan CN.","BibLvlCode":"MS","StandardTitle":"Geïdealiseerde processtudie van systeemovergangen naar hypertroebelheid: WP 6.1 Tijdsintegrator","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2026-04-17 01:41:05.351938","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":2024,"DateUpdate":"2024-12-06","DateCreate":"2024-12-02","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":404652,"ISBN":null,"PubliDate":2024,"IssueDate":null,"Volume":"13_103_15","Issue":null,"Pagination":"VIII, 21 + 4 p. bijl.","Place":"Antwerpen","Edition":"Versie 4.0","BRefXtra":null,"BRefXtraRR":null,"SerID":24938,"SerRR":"WL Rapporten. Waterbouwkundig Laboratorium: Antwerpen. ","Ser2BRefID":null,"Ser2RR":null,"StandardTitleSer":"WL Rapporten","ISSN":null,"AbbrevSer":null,"Degree":null,"ThesisID":null,"InsID":null,"Acronym":null,"FullStandardName":null,"ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":21},"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":[{"Surname":null,"Firstname":null,"Initials":null,"PerPublicFlag":null,"InsPublicFlag":1,"Acronym":"VNSC","OrigNameLangCode":"en","OrigNameLangID":15,"FullOrigName":"Flemish-Dutch Scheldt Commission","InsOwnerCNT":1,"PersID":null,"InsID":9808,"PersLink":1,"InsLink":1,"FullInstitute":"Vlaams-Nederlandse Scheldecommissie","RoleID":32,"Role":"Proposer","OrigName":"Flemish-Dutch Scheldt Commission","StandardName":"Vlaams-Nederlandse Scheldecommissie","FullAcronym":"VNSC"}],"authors":[{"AutName":"Brouwer","Firstname":null,"Initials":"R.L.","Affiliation":"Flanders Hydraulics Research","Discriminator":null,"CorporateFlag":0,"BEntID":402445,"AutID":234874,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":"WL","InsFSN":"Vlaamse overheid; Beleidsdomein Mobiliteit en Openbare Werken; Vlaams Ministerie Mobiliteit en Openbare Werken; Departement Mobiliteit en Openbare Werken; Waterbouwkundig Laboratorium","ORCID":"0000-0001-6154-3410","PersID":32966,"InsID":116},{"AutName":"Schramkowski","Firstname":"George","Initials":"G.","Affiliation":null,"Discriminator":null,"CorporateFlag":0,"BEntID":402445,"AutID":381017,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":null,"ORCID":"0000-0002-2120-1085","PersID":11378,"InsID":null}],"mapdetails":null,"datasets":null,"monographs":null,"monparts":null,"serparts":null,"BEntOpen":402445,"BEntPrivate":null,"availability":[{"BInstID":410629,"LibID":2706,"BRefID":404652,"EmbargoDate":null,"FullEmbargoDate":null,"PhysMedID":16,"hasOCRd":1,"ShelfLocCode":"410629","RFID":null,"PaidValue":null,"Medium":"Server","Description":"Open Archive Documents","Acronym":"WL","Library":"Waterbouwkundig Laboratorium","DutchTerm":"Open Archief","URL":null,"ClassifID":223,"Classification":"Open Repository","ReqLink":null,"ClassifTypID":2,"URLLocation":"https://www.vliz.be/imisdocs/publications/","SubDir":1,"InternalReq":0,"LoggedInReq":0,"Disclaimer":"Disclaimer_OWA","DutchDisclaimer":null,"FileFormat":".pdf","FileDescr":"pdf","InsPub":1,"InsID":116,"FileFormID":6,"LendableFlag":null,"PublicFlag":1,"orderLib":"Waterbouwkundig Laboratorium","Notes":null,"AccConID":null,"AccessConstraint":null,"LicURL":null}],"litstyles":[{"LitStyID":20,"Style":"Project report"}],"thespers":null,"arch2discl":462,"SERpubls":[{"PublName":"Waterbouwkundig Laboratorium","Place":"Antwerpen"}],"MONpubls":null,"pictures":[{"pic_id":172566,"Typ":7,"Descr":"From reference","imis_show":1,"preferred":1,"URL":"/en/imis?page=image&pic=172566","ext":"jpg","url":"https://images.vliz.be/thumbs/172566_ge-dealiseerde-processtudie-van-systeemovergangen-naar-hypertroebelheid-wp-6-1-tijdsintegrator.jpg"}],"thestermsPath":[{"ThesaurusTerm":"Cohesive sediment","ThestID":169969,"Acronym":"WL_KD","ThesTermPath":"Hydraulics and sediment > Sediment > Cohesive sediment"},{"ThesaurusTerm":"Sediment transport","ThestID":177356,"Acronym":"WL_KD","ThesTermPath":"Hydraulics and sediment > Sediment > Sediment transport"},{"ThesaurusTerm":"Upstream discharge","ThestID":169973,"Acronym":"WL_KD","ThesTermPath":"Hydraulics and sediment > Sediment > Upstream discharge"},{"ThesaurusTerm":"Numerical modelling","ThestID":169920,"Acronym":"WL_KDT","ThesTermPath":"Numerical modelling"}],"thestermsASFA":[{"ThesaurusTerm":"Cohesive sediment"},{"ThesaurusTerm":"Numerical modelling"},{"ThesaurusTerm":"Sediment transport"},{"ThesaurusTerm":"Upstream discharge"}],"taxtermsASFA":null,"geotermsASFA":[{"GeoTerm":"Scheldt Estuary"}],"collections":[{"Collection":"Waterbouwkundig Laboratorium","ShortName":"WL"}],"conf":null,"proj":null,"Physdatasets":null,"spcols":{"1020":{"SpName":"FRIS (WL)","SpColID":1020,"ParSpColID":130,"TopParID":130,"ShortName":"FRIS (WL)","URLLocation":null,"LibID":2706,"OpenRepoFlag":null,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"WL/FRIS (WL)"},"462":{"SpName":"OpenDocs:OWA","SpColID":462,"ParSpColID":130,"TopParID":130,"ShortName":"OWA","URLLocation":"https://documentatiecentrum.watlab.be/owa/imis.php?module=ref&refid=","LibID":2706,"OpenRepoFlag":1,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"WL/OWA"},"130":{"SpName":"Waterbouwkundig Laboratorium","SpColID":130,"ParSpColID":null,"TopParID":null,"ShortName":"WL","URLLocation":null,"LibID":2706,"OpenRepoFlag":null,"SpTypID":1,"TopParIDNotWebsite":null,"SpColPath":"WL"},"1025":{"SpName":"WL expert","SpColID":1025,"ParSpColID":null,"TopParID":null,"ShortName":"WL expert","URLLocation":null,"LibID":null,"OpenRepoFlag":null,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"WL expert"},"361":{"SpName":"WL Rapporten","SpColID":361,"ParSpColID":130,"TopParID":130,"ShortName":"wl rapporten","URLLocation":null,"LibID":2706,"OpenRepoFlag":null,"SpTypID":null,"TopParIDNotWebsite":null,"SpColPath":"WL/wl rapporten"}},"doi":null,"publs":[{"PublID":2030,"PublName":"Waterbouwkundig Laboratorium","InsID":116,"PersID":null,"INBOID":6434,"OrderNr":1}],"serparttypes":null,"monauthors":null,"MParts":null,"SParts":null,"hLibs":null,"langs":[{"BEntID":402445,"AbstractFlag":0,"LangID":41,"LangCode":"nl","Lang":"Dutch","DutchTerm":"Nederlands","LangCodeExtended":"dut"},{"BEntID":402445,"AbstractFlag":1,"LangID":41,"LangCode":"nl","Lang":"Dutch","DutchTerm":"Nederlands","LangCodeExtended":"dut"}],"urls":null,"thesterms":[{"ThesaurusTerm":"Cohesive sediment","ThestID":169969,"Acronym":"WL_KD","ThesTypID":12,"ThesType":"WL Kennisdomein"},{"ThesaurusTerm":"Numerical modelling","ThestID":169920,"Acronym":"WL_KDT","ThesTypID":13,"ThesType":"WL Kennisdomein types"},{"ThesaurusTerm":"Sediment transport","ThestID":177356,"Acronym":"WL_KD","ThesTypID":12,"ThesType":"WL Kennisdomein"},{"ThesaurusTerm":"Upstream discharge","ThestID":169973,"Acronym":"WL_KD","ThesTypID":12,"ThesType":"WL Kennisdomein"}],"taxterms":null,"geoterms":[{"GeoTerm":"Scheldt Estuary","GeoObjectID":4812,"GeotID":8468}],"othterms":null,"asfacodes":null,"asfa2codes":null,"thestermsFRIS":[{"ThesaurusTerm":"Cohesive sediment","DutchTerm":"Cohesief sediment","ThestID":169969,"Acronym":"WL_KD","ThesTypID":12,"ThesType":"WL Kennisdomein"},{"ThesaurusTerm":"Numerical modelling","DutchTerm":"Numerieke modelleringen","ThestID":169920,"Acronym":"WL_KDT","ThesTypID":13,"ThesType":"WL Kennisdomein types"},{"ThesaurusTerm":"Sediment transport","DutchTerm":"Sedimenttransport","ThestID":177356,"Acronym":"WL_KD","ThesTypID":12,"ThesType":"WL Kennisdomein"},{"ThesaurusTerm":"Upstream discharge","DutchTerm":"Bovenafvoer","ThestID":169973,"Acronym":"WL_KD","ThesTypID":12,"ThesType":"WL Kennisdomein"}],"taxtermsFRIS":null,"geotermsFRIS":[{"GeoTerm":"Scheldt Estuary","DutchTerm":"Schelde-estuarium"}],"othtermsFRIS":null,"resmessage":"","complete":1,"sessions":{"newSesName":"Baertsoen, Claudia, C.","newSesDate":{"date":"2024-12-02 14:39:59.993000","timezone_type":3,"timezone":"Europe/Brussels"},"updSesName":"Cerpentier, Steven, S.","updSesDate":{"date":"2024-12-06 11:56:30.693000","timezone_type":3,"timezone":"Europe/Brussels"}}}