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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