1. Expanding Our Global Opportunities - 2010 Techniques for Mapping In-River Geomorphology, Sediment Transport and River Bank Structures Robert Feldpausch, Principal Scientist/Hydrographer (Tetra Tech) - Presenter Brent Johnston, Senior Sonar Specialist (Tetra Tech) Brian Blevins, Survey Business Development Manager, PLS (Tetra Tech)

2. Expanding Our Global Opportunities - 2011 Overview Mapping systems and methods – Global and attitude positioning systems/sensors – Multi-channel single beam echosounder (sweep) – Multibeam echosounder – Vessel-mounted LiDAR and cameras Data products and analysis – Point clouds, grids, digital terrain models, contours – GIS and ACAD charts and models Data repeatability over time Examples of data use

3. Expanding Our Global Opportunities - 2011 In-River Mapping Objectives Primary Goals Support sediment investigations, surface water modeling, and remediation design, implementation, and monitoring Support construction design, implementation, and monitoring Secondary Goals Delineate depositional and erosional areas, evaluate stability, and correlate analytical data Map river bank structures, cultural artifacts, and utilities Define sediment bottom types

4. Expanding Our Global Opportunities - 2011 Global and Attitude Positioning Systems Global Navigation Satellite Systems – Sub cm accuracy (RTK GPS static) NAVSTAR (US - GPS) - 24 GLONASS (Russian) - 23 – XYZ positioning, vessel squat, and settlement Inertial and Attitude Systems – Vessel heave, pitch, roll, yaw compensation Sound Velocity Sensors – Sonar speed of sound corrections

5. Expanding Our Global Opportunities - 2011 Full or partial bottom coverage w/ moderate resolution in shallow water Higher resolution than single beam, but lower than multibeam More efficient than multibeam in shallow water Efficient mapping in 1- to 8-ft water depth Fixed ~25-ft swath regardless of water depth River Shoals: Multi-channel Echosounder

6. Expanding Our Global Opportunities - 2011 Multi-channel Data Example ~0 – 10-ft depth range 3.5 x 0.5 mile reservoir

7. Expanding Our Global Opportunities - 2011 River Channel: Multibeam Echosounder Full bottom coverage, high resolution Higher resolution than multi-channel and single beam (over 250 beam up to 50 pings/sec) More efficient than multi- channel in > 8 ft depth water Swath varies by water depth (~3.5x water depth)

8. Expanding Our Global Opportunities - 2011 River Channel and Bank: Dual Multibeam Echosounder Each system rotated 30 degrees Data collection under structures, up bank to water surface (180° swath) Orientation increases coverage and efficiency in channelized areas Survey of either bank, up, or down river

9. Expanding Our Global Opportunities - 2011 Multibeam Example Data

10. Expanding Our Global Opportunities - 2011 River Bank: Vessel-mounted LiDAR Maps river bank with full coverage Resolution similar to multibeam plus photos/video Continuous terrain model of river bank, bottom and under structures with multibeam and/or multi-channel (260° swath)

11. Expanding Our Global Opportunities - 2011 Vessel-mounted LiDAR and Multibeam

12. Expanding Our Global Opportunities - 2011 Vessel-mounted LiDAR and Multibeam Construction and design support and drawings for terrain and debris avoidance As-built drawings

13. Expanding Our Global Opportunities - 2011 River Bank: Vessel-mounted Camera Geo-referenced photo/video collected with VML Interactive GIS with hyperlinked photos Snapshot of project conditions and above water features

14. Expanding Our Global Opportunities - 2011 Repeatability on the order of 0.1 to 0.2 ft in shallow water 0 to 30 ft ( More than a pretty picture) Data Repeatability Average = 0.01 ft Median = 0.04 ft SD = 1.4 ft Range = -23.0 to 28.4 ft N = 4 million Average = 0.11 ft Median = 0.16 ft SD = 0.78 ft Range = -5.6 to 3.4 ft N = 3 million LFR OU4 N Bathymetry 2004 vs. 2008 LFR OU5 Bathymetry 2008 vs. 2010

15. Expanding Our Global Opportunities - 2011 Time Series Bathymetry Data Short and long term monitoring – Same area and comparable survey methods – Time lapse of minutes, hours, months or years Various triggers to implement survey – Flow conditions/floods – sediment transport studies – Construction/dredging planning prior implementation – Operations, Maintenance and Monitoring Plan (OMMP)

16. Expanding Our Global Opportunities - 2011 Monitor and evaluate dredge effectiveness and changes in bottom elevations (areas adjacent to dam and fish ladder) Dual multibeam surveys 20092011 Time Series: Before & After Dredge

17. Expanding Our Global Opportunities - 2011 300-ft 80-ft 20092011 2009 (green) / 2011 (yellow) Time Series: Before & After Dredge

18. Expanding Our Global Opportunities - 2011 Annual Comparisons: OMMP Environmental sediment cap monitoring Single beam and multibeam surveys 2006 2004 2008

19. Expanding Our Global Opportunities - 2011 Time Series Data: Difference Plots Sediment cap OMMP - Deposition, scour, and settling of sediment cap 2006 - 2004 2008- 2006

20. Expanding Our Global Opportunities - 2011 Summary Mapping Technologies High-accuracy GPS positioning and vessel attitude Multi-channel echosounders – shoal areas Multibeam echosounder – channels, structure and banks Vessel-mounted LiDAR and photos – banks and structures GIS Data Integration, Products, and Analysis Integrated multi-channel, multibeam, LiDAR, and photos Point clouds, grids, digital terrain models, contours, design models and georeferenced and hyperlinked photos River geomorphology, sediment transport, and river bank structures

21. Expanding Our Global Opportunities - 2011 Questions?