Presenter: (Louie) L. Yu Lin( )Title: Hydraulics Engineer

Memphis District

Date: August 23, 2010

ObjectivesObjectives

Develop Unsteady State Model UsingDevelop Unsteady State Model Using Hec-RAS Model

Support the White River Comprehensive St dStudy

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ProceduresProcedures

Develop GIS Based InformationDevelop GIS Based Information Conduct Field Study

P f H S Perform Hyro-Survey Collect Gage Stage/Flow Data Develop Cross Sections Build Hec-RAS ModelBuild Hec RAS Model Calibrate Model

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Unsteady State ModelHec-RAS

Conservation of MassConservation of Mass

C ti f M t Conservation of Momentum

Conservation of Energy

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GIS InformationGIS Information

2006 Aerial Photos2006 Aerial Photos U.S.G.S Quad Maps

Whit Ri C t Li White River Center Line White River Overbank White River Flowlines (1 – 2 year

flowlines))

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Field Study (2008-2009)

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Hydro-Survey(2008-2009)

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Add XYZ with Aerial PhotoAdd XYZ with Aerial Photo

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Digital Elevation Model White River

Convert Hydrologic Datum (Low WaterConvert Hydrologic Datum (Low Water Reference Plane) to Geodetic Datum (NGVD)(NGVD) Combine All Points in Accordance with

Daily Gage ReadingDaily Gage Reading Create White River DEM

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Create Master DEMCreate Master DEM

Collect U S G S DEMCollect U.S.G.S DEM

C il Whit Ri DEM Compile White River DEM

Mosaic both DEMs Using ArcInfo

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Cross SectionsCross Sections

Develop Cross Sections Including RiverDevelop Cross Sections Including River Valley and Overland

Present Water Flow through Channel and O l dOverland

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Geo-RAS ModelGeo RAS Model

Develop One-Dimensional HydraulicsDevelop One Dimensional Hydraulics Model for the White River

Create XYZ in ArcInfor

Export to RAS Modelp

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Cross Section ProfileCross Section Profile

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Other FeaturesOther Features

Levee SystemsLevee Systems

B id Bridges

Top Banks

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Frequency and Duration Analyses

Gage Data – Mississippi River JunctionGage Data Mississippi River Junction, Clarendon, DeVall Bluff, DesArc, Georgetown Augusta and NewportGeorgetown, Augusta, and Newport (1965-2009)

Supermodel – Little Rock District (1940-2009)2009)

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(Continued)(Continued)

1 2 5 10 25 50 and 100 Year1, 2, 5, 10, 25, 50 and 100 Year Frequency

Stage Analysis

Statistical Software Package (Hec-SSP)g ( )

Data Storage System or HEC DSSVueBUILDING STRONG®

Data Storage System, or HEC-DSSVue27

Gage DataGage Data

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SupermodelSupermodel

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Frequency AnalysisHec-SSP

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Stage CalibrationStage Calibration230

200

210

220 1 Yr Gage

1 Yr Model

2 Yr Gage

2 Yr Model

180

190

200

Stag

e (ft

) 5 Yr Gage

5 Yr Model

10 Yr Gage

10 Yr Model

25 Y G

160

170

25 Yr Gage

25 Yr Model

50 Yr Gage

50 Yr Model

100 Yr Gage150

0 50 100 150 200 250 300

River Mile

100 Yr Model

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Comments and Question?Comments and Question?

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