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flood analysis software
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TutorialsofNays2DFlood
Exercise1.FloodanalysisExercise2.Tsunamianalysis
Exercise1. Flood analysis
Simulate the flow regime (water depth and flow velocity) by using Nays2DFlood in an actual river section with a flood discharge.
Objectives:
Step1: Prepare the topography data
Step2: Import data and Creating the calculation grid
Step3: Setting the calculation conditions
Step4: Making a simulation
Step5: Visualizing the calculation results
Exercise1.Floodanalysis
Exercise1. Flood analysis
Step1: Prepare the topography data
1. Downloadthetopographydataofthe floodplainfromSRTM(ShuttleRadarTopographyMission NASA).
2. ConverttheSRTMdata byusingQGIS.
Exercise1.FloodanalysisTargetarea
Exercise1.FloodanalysisTargetriver()andfloodplain
Exercise1.Floodanalysis1. Download the topography data of flood plain from SRTM.
Procedureofdownloadthedata:textbookChapter4.URL:http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp
http://srtm.csi.cgiar.org/SELECTION/listImages.asp
Exercise1.Floodanalysis Selectthedownloadoptions.
WorldGeodeticSystemisEPSG:4327:WGS84.CoordinatesystemisUTM.Tiff6.0format.
TaggedImageFileFormatincludinggeoreferencedata.http://srtm.csi.cgiar.org/SELECTION/listImages.asp
Exercise1.FloodanalysisCoordinate System:UTM(UniversalTransverseMercator)
http://www.dmap.co.uk/utmworld.htm
http://coordtrans.com/coordtrans/
Exercise1.Floodanalysis Selectthetargetarea.
Targetareahttp://srtm.csi.cgiar.org/SELECTION/listImages.asp
Exercise1.FloodanalysisClick [ClickheretoBeginSearch>>].
Clickherehttp://srtm.csi.cgiar.org/SELECTION/listImages.asp
Exercise1.FloodanalysisClick [DataDownload(FTP)].
Clickherehttp://srtm.csi.cgiar.org/SELECTION/listImages.asp
Exercise1.FloodanalysisDecompressedthedownloadedfile[srtm_60_05.zip].
Tifffileincludingtopographydata(satellitedate)
Exercise1.Floodanalysis2. Convert the SRTM data by using QGIS
DownloadtheQGISversion2.6(oneofthefreeGISsoftware).URL:http://qgis.org/ja/site/forusers/download.html
or TheinstallerofQGISisintheNays2DFloodsamplefolder.
http://qgis.org/en/site/forusers/download.html
Exercise1.Floodanalysis StarttheQGISversion2.6. Importthesatellitedate[srtm_60_05.tif].
Exercise1.FloodanalysisThen,topographicmapwillappearasbelow;
Exercise1.FloodanalysisChangethelayerpropertyoftheelevationlabel.Rightclickthe[srtm_60_05]intheLayers,andselect[Properties].
Exercise1.FloodanalysisChangetheLayerPropertiesasbelow;
Clickhere
Click[OK]
Exercise1.FloodanalysisThen,thetopographymapbecomesclear.
Exercise1.FloodanalysisNextstepistoclipyourtargetareafromthetopographymap.
Targetarea
Exercise1.Floodanalysis Select[Raster>Extraction>Clipper]onthemenubar.
Exercise1.Floodanalysis Inthe[Clipper]window,entertheinputandoutputfilenames.
SelectthetargetareabyPCmouse
Exercise1.Floodanalysis SelectthetargetareaonthetopographymapbyPCmouse.
Exercise1.FloodanalysisTargetareawillbeclippedasbelow;
RemovetheoldlayerNewlayerwillappear.
Exercise1.FloodanalysisChangetheCoordinatefrom[latitude/longitude()]to[PlaneCoordinates(XY)].
Select[Raster>Projections>Warp(Reproject)]onthemenubar.
Exercise1.FloodanalysisEntertheinputandoutputfilenames. Selectthecoordinatesystemofinputandoutputfiles,respectively.
WGS84/UTM50N
Exercise1.FloodanalysisCoordinate System:UTM(UniversalTransverseMercator)
http://www.dmap.co.uk/utmworld.htm
50N
Exercise1.FloodanalysisThen,coordinatesystemofthetargetareawillbechangedasbelow;
NewlayerRemovetheoldlayer
Exercise1.FloodanalysisExportthetopographydataofthetargetarea. Select[Raster>Conversion>Translate(ConvertFormat)]onthemenubar.
Exercise1.FloodanalysisEntertheInputandoutputfilenames.
[.xyz]fileextension
Exercise1.Floodanalysis Selectthecoordinatesystemoftheinputfile.Click[OK].
Exercise1.FloodanalysisAftergettingthetopographydatafromQGIS,wehavetochangetheformatofthefiletobeabletoreaditintotheiRIC.
Openthe[srtm_60_05_ex2.xyz]filebyExcelsoftware.
Openthe[.xyz]filebyExcelsoftware.
Exercise1.FloodanalysisCheckthenumberoflinesofdata. Insertablanklineatthetopofthesheet.Addthetotalnumberoflinesinthefirstrowandsaveit.
Xcoordinate Ycoordinate Zcoordinate
12
3
Exercise1.FloodanalysisChangetheextensionfrom[.xyz]to[.tpo]tobeabletoreadthefileintotheiRIC software.
Changetheextensionfrom[.xyz]to[.tpo].
Topographydatawascompleted!!
Exercise1. Flood analysis
Step2: Input the topography data and
Create calculation grid
1. StarttheiRIC software2. Inputthetopographydata3. DownloadbackgroundimagesfromGooglemap4. Createcalculationgrid
Exercise1.Floodanalysis1. Start iRIC software
StarttheiRIC version2.3. Select[CreateNewProject].
Exercise1.Floodanalysis Select Nays2DFloodv4.1.
Exercise1.FloodanalysisOpenthePreProcessingWindowforNays2DFlood.
Exercise1.Floodanalysis2. Import the topography data
Select[Import>GeographicData>Elevation]onthemenubar. Import[srtm_60_05_ex2.tpo]file.
Import[srtm_60_05_ex2.tpo]file.
Exercise1.FloodanalysisThen,topographymapwillappearasbelow;
Exercise1.FloodanalysisChangethecolorlabeloftheelevation.Rightclick[Elevation]intheobjectBrowser. Select[ColorSetting].
Exercise1.Floodanalysis Setthevaluerangeofelevationasbelow;
RemovethecheckSetthevalue
Exercise1.Floodanalysis3. Download back ground mages from Google map
Changethetransparentofthetopographymap.Rightclick[Points1]intheobjectBrowser,andselect[Property].
Exercise1.Floodanalysis SettheDisplayMethodas[Surface].Checktheboxof[Transparent],andthevalueissetto[30].
Exercise1.FloodanalysisThen,topographicmapwillbesemitransparent.
Exercise1.Floodanalysis SelectthecoordinatesystembeforewedownloadGooglemap. Selectthe[File>]onthemenubar.
Exercise1.FloodanalysisClicktheEditintheProjectPropertywindow.
Exercise1.FloodanalysisEnter[WGS84]intheSearchbox. Select[EPSG:32650:WGS84/UTMzone50N]Click[OK].
Exercise1.Floodanalysis Select[import>GoogleMapBackgroundImage].
Exercise1.Floodanalysis SelectaresolutionofGooglemapintheZoombox.Thedefaultnumberofzoomissetdependontheyourtopographydataincludingcoordinate.
Ifyouwanttodecreasetheresolution,youcanchangethenumbersmall.
Exercise1.FloodanalysisGooglemapimageswillbedownloadedbehindofthetopographymap.
Exercise1.Floodanalysis4. Create the calculation grid
Select[Grid>SelectAlgorithmtoCreateGrid]. Select[Creategridfrompolygonallineandwidth].
Leftclick
Doubleclick(or[ENTER])
drag
SelectfromUpstreamtoDownstream
Exercise1.Floodanalysis SetthegridcellnumbersintheXandYdirections. Setthewidthofthecalculationgrid.
Exercise1.FloodanalysisCalculationgridwillbecreated.
Exercise1.FloodanalysisChecktheelevationcontourofthecalculationgrid.
Check
Removethecheck
Exercise1. Flood analysis
Step3: Set the calculation conditons
1. Setthecalculationconditions2. Settheinflowpointsanddischarge
Exercise1.Floodanalysis
Selectthe[CalculationCondition>Setting..]onthemenubar.1. Set the calculation conditions
SetOutflowconditionforbothj=1andnj boundaries
SelectInflow/OutflowBoundaryConditionsintheGroups. SettheBoundaryConditions:Outflow
Exercise1.Floodanalysis
Exercise1.Floodanalysis
Select[InitialWaterSurface]inthegroup.Noneedtochangetheconditions.
Exercise1.Floodanalysis
Select[Time]intheGroups.Outputtimeinterval(Sec):600(s)Calculationtimestep(Sec):3(s)
Exercise1.Floodanalysis
Select[Others]intheGroups.Noneedtochangetheconditions.
Exercise1.Floodanalysis
Exercise1.Floodanalysis
Rightclick[BoundaryConditionSetting]intheObjectBrowser. Select[AddInflow].
2. Set the inflow points of the calculation gird
Exercise1.FloodanalysisThen,newlayer[NewInflow]willappear.
Exercise1.FloodanalysisThen,BoundaryConditionwindowwillappear.Changethename:inflow_1 Select[Edit]tosetdischargedata.
Exercise1.FloodanalysisClick[Import].Then,select[qt1_1.csv]fileinthe[Nays2DFlood>Sample_data>Exercise1_Flood]
Exercise1.FloodanalysisThen,dischargewillbeimported.Click[OK].
Exercise1.Floodanalysis Select[Grid>BoundaryCondition>Inflow_1]. Selectinflownodesasbelow:
Exercise1.FloodanalysisThen,rightclickonthetopographymap. Select[AssignCondition].
Exercise1.FloodanalysisThen,thenameofinflowwillbeappearasbelow;
Exercise1.Floodanalysis Inthesameway,wewillsetanotherinflowpoints(inflow_2).Dischargedatais[qt1_2.csv]inthe[Nays2DFlood>Sample_data >Exercise1_Flood]
Inflow_2
Exercise1. Flood analysis
Step4: Making a simulation
Exercise1.FloodanalysisOnthemenubar,select[Simulation>Run].Also,saveyourfileasaniproformat(Compressedfile).
Exercise1.FloodanalysisThen,solverconsolewindowwillappear.
Exercise1. Flood analysis
Step5: Visualizing the calculation results
Exercise1.Floodanalysis Select[CalculationResult>Opennew2DPostProcessingWindow]onthemenubar.
Exercise1.FloodanalysisCheckthe[Depth]and[BackgroundImages]intheObjectBrowser.
Exercise1.FloodanalysisRightclick[Scalar],andselect[Property..]tochangethecolorvalueofthecontourmapofdepth(m).
Exercise1.Floodanalysis Setthecolorvalueofthecontourmapofthedepth(m).
Exercise1.FloodanalysisAnimationofthecalculationresults.
Startbutton
Exercise1.Floodanalysis
Exercise1.Floodanalysis Saveanimagefileofthecalculationresults.
Clickthisbutton
Exercise1.FloodanalysisEnterthefilenameandselectthefileextension.
Exercise1.Floodanalysis Saveananimationfileofthecalculationresults.
Clickthisbutton
Exercise1.FloodanalysisClick[Next].
Exercise1.FloodanalysisClick[Next].
Exercise1.Floodanalysis SelectthewindownumberofthePostProcessing(2D).
Exercise1.Floodanalysis Specifythefoldertosavetheanimationfile.
Exercise1.FloodanalysisCheckthe[Outputmoviefiles]. Setthetotalmovielength(sec.).
Exercise1.FloodanalysisClick[Next].
Exercise1.FloodanalysisClick[Next].
Exercise1.FloodanalysisClick[Finish].
Pleasewait.
Exercise1.FloodanalysisClick[Finish].
Exercise1.FloodanalysisAnimationfile[image.wmv]willbecreatedinthespecifiedfolder.
End.
SettingtheroughnessconditionActuary,theroughnessconditionshouldbesetthevaluewhichdependsonlanduse.
/ColorImageDict > /JPEG2000ColorACSImageDict > /JPEG2000ColorImageDict > /AntiAliasGrayImages false /CropGrayImages true /GrayImageMinResolution 300 /GrayImageMinResolutionPolicy /OK /DownsampleGrayImages true /GrayImageDownsampleType /Bicubic /GrayImageResolution 300 /GrayImageDepth -1 /GrayImageMinDownsampleDepth 2 /GrayImageDownsampleThreshold 1.50000 /EncodeGrayImages true /GrayImageFilter /DCTEncode /AutoFilterGrayImages true /GrayImageAutoFilterStrategy /JPEG /GrayACSImageDict > /GrayImageDict > /JPEG2000GrayACSImageDict > /JPEG2000GrayImageDict > /AntiAliasMonoImages false /CropMonoImages true /MonoImageMinResolution 1200 /MonoImageMinResolutionPolicy /OK /DownsampleMonoImages true /MonoImageDownsampleType /Bicubic /MonoImageResolution 1200 /MonoImageDepth -1 /MonoImageDownsampleThreshold 1.50000 /EncodeMonoImages true /MonoImageFilter /CCITTFaxEncode /MonoImageDict > /AllowPSXObjects false /CheckCompliance [ /None ] /PDFX1aCheck false /PDFX3Check false /PDFXCompliantPDFOnly false /PDFXNoTrimBoxError true /PDFXTrimBoxToMediaBoxOffset [ 0.00000 0.00000 0.00000 0.00000 ] /PDFXSetBleedBoxToMediaBox true /PDFXBleedBoxToTrimBoxOffset [ 0.00000 0.00000 0.00000 0.00000 ] /PDFXOutputIntentProfile () /PDFXOutputConditionIdentifier () /PDFXOutputCondition () /PDFXRegistryName () /PDFXTrapped /False
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