TutorialsofNays2DFlood

Exercise2.Tsunamianalysis

Exercise2. Tsunami analysis

Simulate the flow at a river mouth when tsunami-runup-induced flooding occurs by using Nays2DFlood.

Objectives:

Step1: Import data and Creating the calculation grid

Step2: Setting the calculation conditions

Step3: Making a simulation

Step4: Visualizing the calculation results

Exercise1.FloodanalysisTargetisrivermouseof.

Exercise2. Tsunami analysis

Step1: 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.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.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].

Exercise1.Floodanalysis SettingthegridcenterlinebyPCmouse.

Exercise1.Floodanalysis SetthegridcellnumbersintheXandYdirections. Setthewidthofthecalculationgrid.

Exercise1.FloodanalysisCalculationgridwillbecreated.

Exercise1.FloodanalysisChecktheelevationcontourofthecalculationgrid.

Check

Removethecheck

Exercise2. Tsunami analysis

Step2: Set the calculation conditions

1. Setthecalculationconditions2. Settheinflowpointsanddischarge3. Settheroughnessconditions4. Correctingtheelevationofseaarea

Exercise1.Floodanalysis

Selectthe[CalculationCondition>Setting..]onthemenubar.1. Set the calculation conditions

SelectInflow/OutflowBoundaryConditionsintheGroups.TheBoundaryConditions:OutflowThewatersurfaceatdownstream:Readfromfile Select[Edit]tosetthewatersurfacelevelatthedownstream.

Exercise1.Floodanalysis

Click[Import],andselect[dh01.txt]fileinthe[Nays2DFlood>Sample_data >Exercise2_Tsunami]

Exercise1.Floodanalysis

Then,watersurfacelevel(m)atthedownstreamwillbeimported.Exercise1.Floodanalysis

Select[InitialWaterSurface]inthegroup. Initialwatersurface:Constantslope. Initialwatersurfaceslopeofmainchannel:0.0001

Exercise1.Floodanalysis

Select[Time]intheGroups.Outputtimeinterval(Sec):20(s)Calculationtimestep(Sec):0.2(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

Then,newlayer[NewInflow]willappear. Selecttheinflowpointsbyusingpolygonasbelow;

Exercise1.Floodanalysis

Exercise1.FloodanalysisThen,BoundaryConditionwindowwillappear.Changethename:inflow_1 Select[Edit]tosetdischargedata.

Exercise1.FloodanalysisClick[Import].Then,select[qt01.txt]fileinthe[Nays2DFlood>Sample_data >Exercise2_Flood]

Exercise1.FloodanalysisThen,dischargewillbeimported.Click[OK].

Exercise1.Floodanalysis

Rightclick[RoughnessCondition]intheObjectBrowser. Select[Add>Polygon].

3. Set the roughness condition

Exercise1.Floodanalysis Selectallgridcellsbypolygon,andclick[Enter].Roughnessconditionoffloodplain(building):0.08

Exercise1.Floodanalysis Inthesameway,makeapolygon2andspecifythelowchannelarea. SettheRoughnesscondition:0.025

Exercise1.Floodanalysis Inthesameway,makeapolygon3andspecifytheseaarea. SettheRoughnesscondition:0.025

Exercise1.Floodanalysis4. Correcting the elevation of sea area

Rightclick[RoughnessCondition >Polygon3]intheObjectBrowser. Select[Copy].

Exercise1.FloodanalysisThen,SelectGeographicDatawindowwillappear. Select[Elevation]andclick[OK]. Input[3]asanelevationvalueoftheseaarea.

Exercise1.FloodanalysisAftermakingseveralpolygons,select[Grid>AttributesMapping>Execute]toassignthevaluetothecalculationgrid.

Exercise1.FloodanalysisCheckeithertheroughnesscoefficientsarepropertyassigned.

Check

Removethecheck

Exercise2. Tsunami analysis

Step3: Making a simulation

Exercise1.FloodanalysisOnthemenubar,select[Simulation>Run].Also,saveyourfileasaniprofileformat(Compressedfile).

Exercise1.FloodanalysisThen,solverconsolewindowwillappear.

Exercise2. Tsunami analysis

Step4: Visualizing the calculation results

Exercise1.Floodanalysis Select[CalculationResult>Opennew2DPostProcessingWindow]onthemenubar.

Exercise1.FloodanalysisCheckthe[Depth]and[BackgroundImages]intheObjectBrowser.

Check

Exercise1.FloodanalysisRightclick[Scalar],andselect[Property..]tochangethecolorvalueofthecontourmapofdepth(m).

Exercise1.Floodanalysis Setthecolorvalueofthecontourmapofthedepth(m).

Exercise1.FloodanalysisAnimationofthecontourmapofDepth(m).

Startbutton

Exercise1.Floodanalysis

Exercise1.FloodanalysisVisualizingflowvector.Check[Arrows]and[Velocity].

Exercise1.FloodanalysisRightclick[Allow],andselect[Property..]tochangetheallowlengthofthevelocityvectormap;.

Exercise1.Floodanalysis Settheallowlengthofthevelocityvectormap.

Exercise1.FloodanalysisAnimationofthecontourmapofdepthandvelocityvectormap.

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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