presentation of mobile mapping pilot study · 2018. 4. 2. · mobile mapping pilot study inspecting...

Mobile Mapping Pilot StudyInspecting the Los Angeles River Levee

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Orlando Lopes, EIT

Presentation of

Mobile Mapper

Periodic Inspections

Levee Embankment Rated Item1. Non-Compliant Vegetation Growth2. Sod Cover3. Encroachments4. Closure Structures5. Slope Stability6. Erosion/Bank Caving7. Settlement8. Depressions/Rutting9. Cracking10. Animal Control11. Culverts/Discharge Pipes12. Riprap Revetments and Bank Protection13. Revetments other than Riprap14. Underseepage Relief Wells/Toe Drainage Systems15. Seepage

Data Collection

Data Collection

Set-up, establishing controls (i.e. connecting to satellites), driving the levee at the riverside toe and on the crown, and system shutdown.

Details: Time: About 3.5 hours

Length of levee reach: Approximately 8 miles of levee (1 run on crown and 1 along riverside toe)

Average Travel Speed: Approx. 20 mph

Post-Processing the Data

Compiling, scanning through digital information, interpolating missing data, extraction, and noting/logging deficiencies along the levee

Details: Length: Approximately 2 mile reach

Time: Approximately 4-5 hours for the 2 mile reach

Tools/tricks: Reconciling the data, auto-populating log for large trees, floodwalls, cutting cross-sections, and creating models

Drive-through of results…

Drive-through of results…

Drive-through of results…

Drive-through of results…

Drive-through of results…

What we couldn’t see…

Summary (in terms of Periodic Inspection)

Challenges

Cannot capture certain items i.e. burrows along the toe, locations with limited access, deficiencies on steep slope, etc.

What worked well

Capturing the following types of deficiencies: vegetation, encroachments, and measurements (models/cross-sections).

Advantages

Time - (could capture up to 12-20 miles per day)

Safety - lowered risk of injury

Data can be viewed and assessed by multiple people at different times

Revisiting site conditions without field visit

Questions?

Orlando Lopes

Orlando.Lopes@tetratech.com