Floodplain Mapping using TINs Triangulated Irregular Networks (TINs) Representation of stream channels using TINs Floodplain delineation using HEC-HMS,

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Presentation transcript:

Floodplain Mapping using TINs Triangulated Irregular Networks (TINs) Representation of stream channels using TINs Floodplain delineation using HEC-HMS, HEC-RAS and ArcView

TIN with Surface Features Classroom Waller Creek UT Football Stadium

A Portion of the TIN

Input Data for this Portion Mass Points Soft Breaklines Hard Breaklines

TIN Vertices and Triangles

TIN Surface Model Waller Creek Street and Bridge

3-D Scene

3-D Scene with Buildings

Floodplain Mapping using TINs Triangulated Irregular Networks (TINs) Representation of stream channels using TINs Floodplain delineation using HEC-HMS, HEC-RAS and ArcView

River Modeling  River hydraulic modeling provides a tool to study and gain understanding of hydraulic flow phenomena  Topographic data describe the geometry of the simulated river system and permit the establishment of model topology  HEC-RAS, MIKE 11 all hydraulic models require channel information for model development

River Morphology

Flood Inundation

Floodplain Delineation

Channel and Cross-Section Direction of Flow Cross-Section Channel

ProfileLines Types 1- Thalweg 2- LeftBank 3- RightBank 4- LeftFloodLine 5- RightFloodLine ProfileLines and CrossSections are linked through Channel_ID

TIN as a source of cross-sections

CrossSections

Elements of a Cross-Section  Geometry  Identifier  Georeference  Property  Supplementary

Floodplain Mapping using TINs Triangulated Irregular Networks (TINs) Representation of stream channels using TINs Floodplain delineation using HEC-HMS, HEC-RAS and ArcView

Floodplain Mapping Approach CRWR-PrePro HEC-GeoRas Water surface profiles ArcView Geometric data Parameters Schematic Flow discharge HEC-HMSHEC-RAS

Purpose Integrate/Validate existing tools for floodplain determination and visualization. –Reduce the dependence on field data. –Improve the floodplain analyses capabilities (lower costs and more accuracy).

Digital Spatial Data ArcView HEC-RASHEC-HMS Digital elevation model (DEM). Stream definition.

CRWR-PrePro ArcView HEC-RASHEC-HMS Watershed delineation. Reach/Watershed parameters determination.

HEC-HMS: Flow Determination ArcView HEC-RASHEC-HMS

HMS-RAS Connection HMS JunctionsRAS Cross-sections ArcView HEC-RASHEC-HMS

HMS-RAS Connection ArcView HEC-RASHEC-HMS (0500, ) HMS Hydrograph RAS Flow Data

Digital Terrain Model: TIN ArcView HEC-RASHEC-HMS Observed points and breaklines for constructing a triangular irregular network (TIN).

Digital Terrain Model: TIN ArcView HEC-RASHEC-HMS Embedding Buildings into the TIN.

GIS-RAS Connection Stream centerline. Banks. Flow paths. Cross sections. ArcView HEC-RASHEC-HMS

GIS-RAS Connection Location of cross sections. ArcView HEC-RASHEC-HMS

Hydraulic Modeling with HEC-RAS RAS stream geometry. Cross-section extracted from the TIN. ArcView HEC-RASHEC-HMS

Hydraulic Modeling with HEC-RAS Resulting water elevations. ArcView HEC-RASHEC-HMS

Floodplain Mapping ArcView HEC-RASHEC-HMS Floodplain for 500 cfs.

Floodplain Mapping 2-D floodplain animation (500 – 5,000 cfs).

Floodplain Mapping 3-D floodplain animation.

Limitations Bridges/culverts: - depend on field data. - data input by hand.

Limitations The accuracy obtained from our TIN is not good enough.

Solutions New technologies (i.e. LADAR) are improving the quality of the digital terrain representations. Source: digital representation of NYC generated by ASI and published by ESRI. New technologies (i.e. LADAR) are improving the quality of the digital terrain representations.