{"refrec":{"BRefID":251991,"RR":"<b>Vanneste, D.; Verwaest, T.; Mostaert, F.</b> (2015). Afgraving schor natuurreservaat IJzermonding: impact op kustveiligheid. Versie 4.0. <i>WL Adviezen</i>, 15_038. Waterbouwkundig Laboratorium: Antwerpen. III, 8 pp.","BEntID":243688,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". Versie 4.0. <i>WL Adviezen</i>, 15_038. Waterbouwkundig Laboratorium: Antwerpen.  III, 8 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Vanneste, D.; Verwaest, T.; Mostaert, F.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Vanneste, D.; Verwaest, T.; Mostaert, F.","Englishabstract":null,"AbstractOtherLang":"In deze nota wordt de impact ingeschat op de kustveiligheid , die een plaatselijke afgraving van gronden in het  natuurreservaat IJzermonding te Nieuwpoort kan veroorzaken, meer bepaald op het overstromingsrisico tijdens  de +8 m storm.  In de bestaande toestand zorgt de verhoogde berm rond +7.9 m TAW voor een volledige breking van de  invallende golven, en vindt er geen overslag over de dijk plaats. Volgens het ontwerp wordt deze verhoogde  berm afgegraven en kunnen de golven aan de rand van de havengeul zich in principe voortplanten tot aan de  teen van de dijk. Naast het ontwerp wordt nog een tweede toestand berekend waarbij  nog een gedeelte (ca. de  helft) van de verhoogde berm behouden blijft.  Om het overstromingsrisico te bepalen na afgraving van de grond werd het gemiddeld overslagdebiet berekend  volgens de methode EuroTop (2007). De berekening werd uitgevoerd voor een karakteristiek dwarsprofiel  centraal gelegen in de zone van afgraving. De invallende golfrandvoorwaarden werden ingeschat op basis van  bestaande SWAN-2D modellering (Vanpoucke, Ph. et al, 2009). Er werd bovendien een toeslag op deze  randvoorwaarden genomen teneinde de onzekerheid op deze waarden af te dekken.  De overslagberekeningen voor de volledige afgraving tonen  aan dat het kritische overslagdebiet van 1 l/s/m niet  overschreden wordt voor een invalsrichting groter dan 60°. In het meest kritisch berekende geval, voor een  maximale golfhoogte en periode en loodrechte golfinval, blijft het overslagdebiet overigens beperkt (<3 l/s/m).  Gelet op het feit dat de golven quasi parallel met de dijk zullen invallen mag geconcludeerd worden dat het  kritisch overslagdebiet voor bresvorming van 1 l/s/m  met een aan zekerheid grenzende waarschijnlijkheid niet overschreden zal worden. De overslagberekeningen voor de gedeeltelijke afgraving tonen aan dat er geen overslag over de dijk plaatsvindt.","BibLvlCode":"MS","StandardTitle":"Afgraving schor natuurreservaat IJzermonding: impact op kustveiligheid","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2026-05-31 01:40:48.571962","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Masterplan Kustveiligheid; Flood risks; Overstromingsrisico","OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":2015,"DateUpdate":"2021-12-03","DateCreate":"2015-12-18","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":251991,"ISBN":null,"PubliDate":2015,"IssueDate":null,"Volume":"15_038","Issue":null,"Pagination":"III, 8","Place":"Antwerpen","Edition":"Versie 4.0","BRefXtra":null,"BRefXtraRR":null,"SerID":116438,"SerRR":"WL Adviezen. 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