Applications of Integrated Vessel-based LiDAR, Multibeam Bathymetry, and Geophysical Surveys for Geohazard Assessments and Site Characterization

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1 Applications of Integrated Vessel-based LiDAR, Multibeam Bathymetry, and Geophysical Surveys for Geohazard Assessments and Site Characterization James Fisher Engineering Geologist Todd Mitchell Survey Manager July

2 Overview Introduction Why Emphasize Data Integration? Marine Survey Methods and Data Examples Data Integration Examples MBES and LiDAR MBES, Magnetometer, Seismic Reflection Seismic Reflection and Marine Resistivity Applications for Geohazard Assessment Coastal and Marine Infrastructure Rock Falls, Coastal Erosion, Slope Failure (Geomorphology) Karst Summary Data Management and Integration using GIS Data Integration and The Big Picture

3 Why Emphasize Data Integration? Geophysics Topography Fully Integrated Data Set Bathymetry Geotechnics/ Geology Integrated data sets improve mapping and geological characterization by helping to produce a complete picture of the surface and subsurface

4 Why Emphasize Data Integration? - Reduce Uncertainty (Risk Management) Taking the Unknown Geological Model (Geophysics) Design Model Geophysics and Geotechnical Data Integration

5 Why Emphasize Data Integration? Consider this

6 Why Emphasize Data Integration? Now compare

7 Why Emphasize Data Integration? By planning an effective geophysical investigation first you can greatly aid future geotechnical investigations LOOSE SAND SOFT NC CLAY STIFF OC CLAY AND DENSE SAND INTERBEDDED SOFT CLAY & SAND INTERBEDDED CHANNEL INFILL

8 Marine Survey Methods Vessel-based LiDAR and Multibeam Bathymetry

9 Marine Survey Methods Vessel-based LiDAR and Multibeam Bathymetry

10 Marine Survey Methods Vessel-based LiDAR and Multibeam Bathymetry (Norfolk, VA Example) Lower Data Density Survey Sunken barge Higher Data Density Survey Better-defined detail of sunken barge Pilings

11 Marine Survey Methods Vessel-based LiDAR and Multibeam Bathymetry A survey that integrates bathymetry with a topographic data can close the gap between surface and underwater topography.

12 Marine Survey Methods Also, both are point cloud data sets (easily, and efficiently, collected and integrated) Multibeam Bathymetry Echosounder (MBES) Data Sonar (sound) based ranging technology Wide coverage on both sides of vessel Millions of individual point observations

13 Marine Survey Methods Also, both are point cloud data sets (easily, and efficiently, collected and integrated) Mobile Laser Scanning Data (LiDAR) Laser (light) based ranging technology Scan land and features beside vessel Millions of individual point observations

14 Marine Survey Methods Also, both are point cloud data sets (easily, and efficiently, collected and integrated)

15 Marine Survey Methods Marine Geophysical Methods Boomer Mag Chirp MBES SSS Measure water depth and map riverbottom 1. Multibeam: hydrographic survey 2. Side scan sonar: image the riverbottom 3. Magnetometer: locate large ferrous or magnetic objects Subsurface mapping 4. Chirp seismic reflection: shallow stratigraphy and potentially buried objects 5. Multichannel, boomer seismic reflection: deeper stratigraphy and depth to bedrock

16 Marine Survey Methods Marine Geophysical Methods Side Scan Sonar

17 Marine Survey Methods Marine Geophysical Methods Side Scan Sonar

18 Marine Survey Methods Marine Geophysical Methods - Seismic Chirp & Pinger: Upper 20 to 50ft Boomer, Multichannel: Upper 500 to 1,500 ft Sparker: Upper 2,000 ft Air Guns: 5,000+ ft

19 Marine Survey Methods Marine Geophysical Methods - Resistivity N Continuous Resistivity Profiling (CRP) Resistivity Section (Below) River Bottom (white line) Deeper Water Area In this example, sediments permeated by fresh water has a higher resistivity (poorer conductor of electricity) than sediments permeated by salt water. The river bottom was mapped using a multibeam echosounder.

20 Marine Survey Methods Marine Geophysical Methods - Resistivity Marine Bottom Resistivity

21 Data Integration (Combining MBES and LiDAR Data Sets)

22 Data Integration (Combining MBES and LiDAR Data Sets)

23 Data Integration (Interpretation Utilizing Multiple Data Sets) Seismic Reflection Riverbottom Pipeline Multibeam Bathymetry Pipeline Surface Expression Magnetometer Magnetic Anomaly

24 Data Integration (Seismic and Resistivity) Resistivity Profile Seismic Refraction Profile MASW (Surface Wave) Profile

25 Data Integration and Applications for Geohazard Assessment Coastal and Marine Infrastructure Bridge River Crossing (Missouri River) Existing Alignment Proposed Alignment

26 Data Integration and Applications for Geohazard Assessment Coastal and Marine Infrastructure Bridge River Crossing (Missouri River)

27 Data Integration and Applications for Geohazard Assessment Coastal and Marine Infrastructure Bridge River Crossing (CA)

28 Data Integration and Applications for Geohazard Assessment Coastal and Marine Infrastructure Bridge River Crossing (FL) Paleochannel (organics) several historical explorations did not completely penetration (depth was unknown costly to project) But geophysics resolved the feature

29 Data Integration and Applications for Geohazard Assessment Rock Falls, Coastal Erosion, Slope Failure (Geomorphology)

30 Data Integration and Applications for Geohazard Assessment Rock Falls, Coastal Erosion, Slope Failure (Geomorphology)

31 Data Integration and Applications for Geohazard Assessment Rock Falls, Coastal Erosion, Slope Failure (Geomorphology)

32 Data Integration and Applications for Geohazard Assessment Rock Falls, Coastal Erosion, Slope Failure (Geomorphology)

33 Data Integration and Applications for Geohazard Assessment Rock Falls, Coastal Erosion, Slope Failure (Geomorphology)

34 Data Integration and Applications for Geohazard Assessment Karst N Water Bottom S Interpreted Horizon Chirp Profile N Seismic Horizon Water Bottom S 2D Resistivity (Adjacent Line)

35 Data Integration and Applications for Geohazard Assessment Karst Features

36 Data Integration and Applications for Geohazard Assessment Karst Features

37 Data Integration and Applications for Geohazard Assessment Karst Features

38 Summary Data Management and Integration using GIS Integrating Data Example (Tunnel Project) Geophysics Bathymetry, Side Scan Sonar, and Seismic

39 Data Integration and Applications for Geohazard Assessment Incorporate Geophysical Data

40 Data Integration and Applications for Geohazard Assessment Incorporate Geotechnical Data

41 Summary Data Management and Integration using GIS Incorporate Historical Data (for example, shorelines from nautical charts)

42 Summary Data Management and Integration using GIS Incorporate Historical Data (for example, shorelines from nautical charts)

43 Data Integration and Applications for Geohazard Assessment Structure Settlement Area Mudflat Area

44 Summary Data Integration and the (Geo) Big Picture Laser Scanning Multibeam Bathymetry Seismic Profile

45 Summary - Why Emphasize Data Integration? Taking the Unknown Geological Model (Geophysics) Design Model Geophysics and Geotechnical Data Integration

46 Comments/Questions? Thank You! James Fisher Todd Mitchell

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