{"refrec":{"BRefID":441065,"RR":"<b>De Roo, S.; Trouw, K.; De Maerschalck, B.</b> (2026). Methodology for Safety Assessment 2021: XBeach BOI – sensitivity analysis and model validation. Version 4.0. <i>FHR reports</i>, 18_037_6. Flanders Hydraulics: Antwerp. VIII, 62 + 5 bijl. pp.","BEntID":438899,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". Version 4.0. <i>FHR reports</i>, 18_037_6. Flanders Hydraulics: Antwerp. VIII, 62 + 5 bijl. pp.","DocTypID":13,"DocType":"Reports","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"De Roo, S.; Trouw, K.; De Maerschalck, B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"De Roo, S.; Trouw, K.; De Maerschalck, B.","Englishabstract":"<span lang=\"EN-US\" dir=\"ltr\">Since the 2015 Coastal Safety Assessment, XBeach is applied for the morphodynamic modelling of the &nbsp;normative storm conditions. Being under continuous development, a further validation of the newest XBeach &nbsp;version was necessary upon use in the 2021 Coastal Safety Assessment (SA21).</span><br><span lang=\"EN-US\" dir=\"ltr\">A thorough sensitivity analysis learned about the differences between the released XBeach versions. Some &nbsp;physics got integrated or improved and the model’s architecture was adjusted at some points. Based on a &nbsp;(limited) model validation with field measurements, it was found that the BOI (Beoordelings- en &nbsp;OntwerpInstrumentarium) settings, calibrated in the framework of the methodology update of the Dutch &nbsp;Coastal Safety Assessment, are also suitable for use along the Belgian coast. Only the wetslp parameter, &nbsp;determining the critical avalanching slope under water, was slightly lowered to 0.10 (instead of 0.15). &nbsp;No structural bias was found in the model’s performance and the scatter index was acceptably low, being &nbsp;0.14 and 0.30 for the modelled retreat distance and erosion volume respectively.</span><br><span lang=\"EN-US\" dir=\"ltr\">The XBeach model set-up and settings for the 2021 Coastal Safety Assessment are now based on the validated &nbsp;2DH application of XBeach as described in this report. For this assessment, the entire Belgian coast will be &nbsp;divided into 28 coastal areas. For each of these coastal areas, the morphodynamic response to a 45-hour &nbsp;normative storm will be assessed and the safety level will be evaluated.</span>","AbstractOtherLang":null,"BibLvlCode":"MS","StandardTitle":"Methodology for Safety Assessment 2021: XBeach BOI – sensitivity analysis and model validation","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-07-29 14:06:46.881123","timezone_type":1,"timezone":"+02:00"},"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":2026,"DateUpdate":"2026-07-29","DateCreate":"2026-07-29","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":0,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":441065,"ISBN":null,"PubliDate":2026,"IssueDate":null,"Volume":"18_037_6","Issue":null,"Pagination":"VIII, 62 + 5 bijl.","Place":"Antwerp","Edition":"Version 4.0","BRefXtra":null,"BRefXtraRR":null,"SerID":254366,"SerRR":"FHR reports. 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