UAS Applications in Hydraulics

Caltrans - Structure Maintenance & Investigations

Hydraulic Branch

UAS Applications in HydraulicsABME SOUTH Meeting

04-12-2021

Presented byKevin Flora (Sr. State Scour Evaluations)

Oscar Suaznabar (State Scour Evaluations)


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• Background

• UAS-based Topographic Mapping Evaluation

• Large-Scale Particle Image Velocimetry (LSPIV)

• Pilot Project:Sacramento River - Knights Landing, CA

Outline


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1. Identification of Scour Critical Bridges Hydraulic Inspections Surveying Hydraulic Modeling Scour Calculations

2. Monitoring of Vulnerable Bridges Flood Evaluations Routine Hydraulic Inspections

3. Make Recommendations and Design of Countermeasures for Scour Damage at Bridges

Background


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Hydraulic Inspections and Surveying

Background


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Bathymetric and Topographic Data to Build Hydraulic Models

Digital Topographic and Bathymetric Data Combined in SMS

Background


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Hydraulic Modeling

…to perform Scour Analysis and Scour Countermeasure Design

Background


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• Motorized Inflatable Boat• Deploying System• PICO MBES-120• External GPS Aided INU• Laptop & Software

Background

Bathymetric Surveys with Multibeam Sonar


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Bathymetric Surveys with Multibeam Sonar Cont’d


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• UAS-based Topographic Mapping

• Large Scale LSPIV – for Estimating Channel Discharge

Unmanned Aircraft Systems (UAS)


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Hydraulics Branch – UAS Fleet

• Weight: 1375 g

• Internal GPS/GLONASS

• Max Wind Speed Resistance: 22 mph

• Max Flight Time: approx. 30 min

• Gimbal Stabilization: 3-axis (pitch, roll, yaw)

• Camera: 20 Mega Pixels and HD and 4K videosName: 56 RIPRAP

Model: DJI Phantom 4 Pro V2


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Name: 56 SCOURModel: DJI Matrice 210

FLIR XT2 IR camera

Hydraulics Branch – UAS Fleet Cont’d


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UAS-Based Topographic Mapping

The process of taking measurements from photographs is called photogrammetry.

In aerial UAS-based photogrammetry a drone captures overlapping images using waypoint navigation technology


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Ground Control Points (GCP)

Cropped Aerial Image with a Black-and-White 12” by 12” GCP Target

GPS UnitTrimble GeoXH



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Post-Processing the Aerial Images

ORTHOMOSAIC

Specialized software integrates the overlapping images (orthophotos) into a large Orthomosaic.



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3D POINT CLOUD

Further processingconverts the image into a 2D or 3D map (DEM, Point Cloud, etc.)


Post-Processing the Aerial Images


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Large-Scale Particle Image Velocimetry (LSPIV)

The importance of Estimating Discharge During Floods

Flood under the Old Route 49South Yuba River, 2017Source (Kelly M. Grow)


Hydraulic Branch Large-Scale Particle Image Velocimetry

What is Particle Image Velocimetry (PIV)?

First Image



Second Image




Velocity Flow Field around an Inundated Bridge Superstructure




Adequate Tracers on the Water Surface

• Flow Patterns• Artificial Seeding Particles• Air Bubbles• Debris During Floods

GCP 1 GCP 2

GCP 3



Results of LSPIV Analysis

Velocity Flow Field in the Channel


Hydraulic Branch Br Nr. 24 0001LRoute 160, Sacramento

Thank You

Kevin Flora (Sr. State Scour Evaluations)Oscar Suaznabar (State Scour Evaluations)

UAS Applications in Hydraulics

Documents

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