{"projectrec":{"ProID":1528,"StandardTitle":"Contribution of SAR (RADARSAT) and AVNIR (ADEOS) images to the study of bathymetry and wave field in the Bay of Hai Phong (Vietnam)","OrigTitle":"Bijdrage van SAR (RADARSAT) en AVNIR (ADEOS) beelden tot de studie van de bathymetrie en het golfvlak in de Baai van Hai Phong (Vietnam)","Acronym":null,"AbstractEnglish":"<li>Objectives :\r\n\r\nThe main objective of the study consists to the process of radar images from ERS-1, ERS-2 and the Canadian satellite RADARSAT, in order to extract the swell plan and to study their anomalies. This information is necessary to explain the localisation of the eroded areas on the coastal zone. The radar images must also be used to validate the swell simulation model by comparison with the swell plan extracted from the radar images.\r\n\r\nThe second objective consists to complete the results obtained during the multitemporal comparison between the aerial photographs of 1952 and of 1993, by using the SPOT XS images and LANDSAT TM images. The documents will allow mapping the areas of erosion and the areas of sedimentation and to establish a relation with the swell plan obtain by simulation. A comparison with the tide currents will be also realised. \r\n\r\n<li>Methods :\r\n\r\n1. Geometrical correction of each satellite image and of the aerial photos in UTM co-ordinates in order to carry out the overlay map.\r\n2. Speckle suppression of the radar images with a median filter 5X5.\r\n3. Directional filters to extracted the linear structures at the sea surface (swell).\r\n4. Overlay between each image and the bathymetry measured in situ.\r\n5. DTM realised with Arcinfo in order to realise the swell simulation model.\r\n6. Mapping of the areas of sedimentation and erosion by overlaying the different images (multitemporal study). Overlaying of RADARSAT (15/12/1996) and SPOT XS (31/08/1992) images overlaid with the coast-lines in 1939 and in 1992. \r\n\r\n<li>Results :\r\n\r\nThe first objective has not been reached, because no radar image were acquired during the specific meteo-marine conditions allowing the location of the swell plan. Only the radar image acquired on 04/06/1997 shows a front-line between two water bodies, that has different physical and chemical patterns. Therefore, the simulation model has not been validated during this study.\r\n\r\nThe map of erosion and sedimentation areas was carried out from the RADARSAT image acquired on 15/12/1996 and from the SPOT XS image acquired on 31/08/1992. This colour composition is used as the background of the map. Over this raster layer, we have put a vector layer that represents the coastline in 1939 (extracted from a topographical map) and the one in 1992 (extracted from aerial photos). Both coastline were crossed using the ArcInfo GIS software, in order to obtained the surface value for eroded and sediment areas.\r\n\r\nThe map of the areas of sedimentation and erosion shows that the sedimentation is often located along the channels and along the rivers. The areas of erosion are located on the coastal line. The phenomena of erosion seem to be due to the effects of the tide currents and to the swell that occur during very strong tempests. Most frequent swells, that occur during the standard meteorological conditions, breaks before to reach the coast-line and, therefore, has almost no influence on the coastal zone evolution.","AbstractOtherLang":"<li>Doelstellingen :\r\n\r\nDe voornaamste doelstelling van de studie bestaat in de verwerking van radarbeelden van ERS-1, ERS-2 en de Canadese satelliet RADARSAT, om het vlak van de golfslag te extraheren en de afwijking ervan te bestuderen. Deze informatie is nodig om de plaats van de geërodeerde gebieden in kustgebieden te verklaren. De radarbeelden moeten ook gebruikt worden om het hoogwaterstandsimulatiemodel te valideren door vergelijking met het golfvlak op radarbeelden.\r\n\r\nDe tweede doelstelling bestaat in de aanvulling van de resultaten verkregen door multitemporele vergelijking tussen de luchtfoto's van 1952 en van 1993, met behulp van de beelden van SPOT XS en LANDSAT TM. De documenten zullen een kartering van de erosie- en sedimentatiegebieden mogelijk maken en een verband vinden met de golfvlakken verkregen door simulatie. Er zal ook een vergelijking gemaakt worden met de getijdenstromen. \r\n\r\n<li>Methoden :\r\n\r\n1. Geometrische correctie van elk satellietbeeld en van de luchtfoto's in UTM coördinaten om de dekkaart te tekenen.\r\n2. Spikkelruissuppressie van de radarbeelden met een mediaanfilter 5X5.\r\n3. Directionele filters om de lineaire structuren aan het zeeoppervlak te extraheren (golfvlak).\r\n4. Elke beeld leggen over de in situ gemeten bathymetrie.\r\n5. DTM met Arcinfo om het golfvlaksimulatiemodel uit te werken.\r\n6. Kartering van de sedimentatie- en erosiegebieden door de verschillende beelden op elkaar te leggen (multitemporele studie). Over elkaar leggen van beelden van RADARSAT (15/12/1996) en SPOT XS (31/08/1992) en de kustlijnen in 1939 en in 1992. \r\n\r\n<li>Resultaten :\r\n\r\nDe eerste doelstelling werd niet gehaald, omdat er geen radarbeelden werden gemaakt bij de specifieke meteo-mariene omstandigheden die het lokaliseren van het golfvlak mogelijk maakten. Alleen het radarbeeld van 04/06/1997 toont een frontlijn tussen twee watermassa's, met verschillende fysieke en chemische patronen. Daarom werd het simulatiemodel niet gevalideerd tijdens deze studie.\r\n\r\nDe kaart van erosie- en sedimentatiegebieden werd uitgetekend met behulp van het RADARSAT-beeld van 15/12/1996 en van het SPOT XS-beeld van 31/08/1992. Deze kleurencomposiet wordt gebruikt als achtergrond van de kaart. Over deze rasterlaag hebben we een vectorlaag aangebracht die de kustlijn weergeeft in 1939 (volgens een topografische kaart) en in 1992 (volgens luchtfoto's). Beide kustlijnen werden vergeleken met behulp van de ArcInfo GIS software, om de oppervlaktewaarde voor geërodeerde en gesedimenteerde gebieden te vinden.\r\n\r\nDe kaart van de sedimentatie- en erosiegebieden toont dat sedimentatie zich vaak voordoet langs de kanalen en langs de rivieren. De erosiegebieden liggen op de kustlijn. De erosieverschijnselen lijken veroorzaakt te worden door de getijdenstroming en de golven bij hevige stormen. Golven, die optreden onderj standaard meteorologische omstandigheden, breken voordat ze de kustlijn bereiken en hebben daarom zo goed als geen invloed op de evolutie van het kustgebied.","DateLastModified":{"date":"2024-05-06 10:25:46.257000","timezone_type":1,"timezone":"+00:00"},"ParentProID":1083,"BeginYear":1997,"EndYear":1997,"BMonth":3,"EMonth":11,"BeginMonth":"March","EndMonth":"November","OrigTitleLangCode":"nl","OrigTitleLangID":41,"OrigTitleLangNL":"Nederlands","OrigTitleLang":"Dutch","OtherAbstractLangCode":"nl","OtherAbstractLangID":41,"OtherAbstractLang":"Dutch","OtherAbstractLangNL":"Nederlands","Progress":"Completed","ProgressNL":"Afgelopen","PublicFlag":1,"CheckedFlag":1,"ND":"2004-09-06","UD":"2007-07-06","DMPFlag":0,"Budget":null,"BudgetCurrency":"EUR"},"parent":{"ProID":1083,"Acronym":"SPSD-I","StandardTitle":"Research action SPSD-I: Sustainable management of the North Sea"},"persons":null,"projects":null,"events":null,"datasets":null,"institutes":[{"instituterec":{"Acronym":"BELSPO","ProPartID":6273,"PublicFlag":1,"OrigNameLangCode":"nl","OrigNameLangID":41,"FullOrigName":"Federaal Wetenschapsbeleid","Line1":"WTC III - Simon Bolivarlaan 30","Line2":"1000 Brussel","Line3":null,"Line4":null,"InsID":120,"FullStandardName":"Belgian Science Policy","Role":"Sponsor","RoleID":3,"EncAddress":"WTC III - Simon Bolivarlaan 30, 1000 Brussel, Belgium"},"parent":null,"institutes":null,"references":null,"conferences":null,"datasets":null,"persons":[],"pastpers":null,"subpers":null,"projects":null,"urls":null,"pictures":null,"published":null,"affrefs":null,"collections":null,"thesterms":null,"taxterms":null,"geoterms":null,"thestermsFRIS":null,"nXtins":null,"previns":null,"spcols":null,"resmessage":"no id specified","complete":0,"participantrec":null,"peerrevs":null,"urlmaps":null},{"instituterec":{"Acronym":"Ulg/GEOMO","ProPartID":6276,"PublicFlag":1,"OrigNameLangCode":null,"OrigNameLangID":null,"FullOrigName":null,"Line1":"Allée du 6 Août, 2 - B11","Line2":"4000 Liège (Sart-Tilman)","Line3":null,"Line4":null,"InsID":3846,"FullStandardName":"Université de Liège; Laboratoire de Géomorphologie et Télédétection","Role":null,"RoleID":null,"EncAddress":"Allée du 6 Août, 2 - B11, 4000 Liège (Sart-Tilman), Belgium"},"parent":null,"institutes":null,"references":null,"conferences":null,"datasets":null,"persons":[{"Surname":"Ozer","Firstname":"André","Initials":"A.","LeaderFlag":0,"PersID":7100,"Role":null,"RoleID":null,"PastInstitute":0,"BeginDay":null,"BeginMonth":null,"BeginYear":null,"EndDay":null,"EndMonth":null,"EndYear":null}],"pastpers":null,"subpers":null,"projects":null,"urls":null,"pictures":null,"published":null,"affrefs":null,"collections":null,"thesterms":null,"taxterms":null,"geoterms":null,"thestermsFRIS":null,"nXtins":null,"previns":null,"spcols":null,"resmessage":"no id specified","complete":0,"participantrec":null,"peerrevs":null,"urlmaps":null}],"refs":null,"urls":[{"URL":"www.belspo.be/belspo/fedra/proj.asp?l=en&cod=t4/dd/18#descr","externalID":null,"URLTypeCode":null,"URLType":"FEDRA metadata","URLTypID":31}],"thesterms":null,"taxterms":null,"geoterms":null,"funderids":[{"FunderID":"T4/DD/18","ThestID":181476,"FunderType":"Other contract id"}],"othtermsFRIS":null,"pictures":[],"spcols":null,"resmessage":"","complete":1}