?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F205%2F&rft.title=Tsunami+risk+modelling+for+Australia%3A+understanding+the+impact+of+data&rft.creator=Hocking%2C+Graeme&rft.creator=Jakeman%2C+John&rft.creator=Sexton%2C+Jane&rft.creator=Wand%2C+Matt&rft.subject=None%2FOther&rft.subject=Information+and+communication+technology&rft.description=Modelling+the+impacts+from+tsunami+events+is+a+complex+task.+A+simplification+is+obtained+by+taking+a+hybrid+approach+where+two+different+models+are+combined%3A+relatively+simple+and+fast+models+are+used+for+simulating+the+tsunami+event+and+the+wave+propagation+through+open+water.+The+impact+from+tsunami+inundation+is+simulated+with+another+type+of+model+which+is+suitable+for+resolving+the+details+of+the+run-up+process+and+the+resulting+inundation.+The+inundation+modelling+is+conducted+using+the+ANUGA+model+which+is+a+result+of+collaboration+between+the+Australian+National+University+and+Geoscience+Australia.+It+solves+the+2D+nonlinear+shallow+water+wave+equations+using+a+finite+volume+method.%0A%0AOne+of+the+critical+requirements+for+reliable+inundation+modelling+is+an+accurate+model+of+the+earth's+surface+that+extends+from+the+open+ocean+through+the+inter-tidal+zone+into+the+onshore+areas+to+be+studied.+Production+of+a+sufficiently+accurate+elevation+model+is+a+complex+and+difficult+process+made+more+difficult+because+the+available+elevation+data+inevitably+will+come+from+a+number+of+different+sources+and+will+have+a+range+of+vintages%2C+resolutions+and+reliability.%0A%0AThere+are+two+questions+that+arise+when+data+is+requested.+The+first+deals+with+the+true+variability+of+the+topography.+Obviously%2C+a+flat+surface+needn%E2%80%99t+be+sampled+nearly+as+finely+as+a+highly+convoluted+surface.+The+second+question+relates+to+sensitivity%3B+how+are+error+bars+derived+for+the+impact+results+if+the+error+bars+on+each+elevation+point+is+known%3F+ANUGA+solves+the+2D+nonlinear+shallow+water+wave+equations+using+a+finite+volume+method+and+typical+models+can+take+days+of+computational+time%2C+so+proper+sensitivity+analyses+are+often+prohibitively+expensive+in+terms+of+computational+resources.%0A%0AThe+main+aim+of+this+project+was+therefore+to+understand+the+uncertainties+in+the+outputs+of+the+inundation+model+based+on+possible+uncertainty+in+the+input+data.&rft.date=2008&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F205%2F1%2Fmisg2008geoscience.pdf&rft.identifier=++Hocking%2C+Graeme+and+Jakeman%2C+John+and+Sexton%2C+Jane+and+Wand%2C+Matt++(2008)+Tsunami+risk+modelling+for+Australia%3A+understanding+the+impact+of+data.++%5BStudy+Group+Report%5D+++++