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

2. TIN with Surface Features Classroom Waller Creek UT Football Stadium

3. A Portion of the TIN

4. Input Data for this Portion Mass Points Soft Breaklines Hard Breaklines

5. TIN Vertices and Triangles

6. TIN Surface Model Waller Creek Street and Bridge

7. 3-D Scene

8. 3-D Scene with Buildings

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

10. 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

11. River Morphology

12. Flood Inundation

13. Floodplain Delineation

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

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

17. TIN as a source of cross-sections

18. CrossSections

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

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

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

22. 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).

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

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

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

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

27. HMS-RAS Connection ArcView HEC-RASHEC-HMS (0500, 3559.6) HMS Hydrograph RAS Flow Data

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

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

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

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

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

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

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

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

36. Floodplain Mapping 3-D floodplain animation.

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

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

39. 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.