utilization of soil moisture for trafficability studies 5 th interagency surface dynamics
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Utilization of Soil Moisture for Trafficability Studies 5 th Interagency Surface Dynamics. Dr. George L. Mason, PE ERDC-GSL Engineering Systems & Materials Division Mobility Systems Branch Research Engineer [email protected] February 29, 2011. Unclassified FOUO. - PowerPoint PPT PresentationTRANSCRIPT
US Army Corps of EngineersBUILDING STRONG®
Utilization of Soil Moisture for Trafficability Studies5th Interagency Surface Dynamics
Dr. George L. Mason, PEERDC-GSLEngineering Systems & Materials DivisionMobility Systems BranchResearch [email protected]
February 29, 2011
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ERDC Mobility Research ApproachVehicle Field Testing Vehicle Terrain Interaction
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Modeling & SimulationMission Level Vehicle Evaluation
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Mobility in Mountain Roads of Afghanistan
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Mobility in Mountain Roads of Afghanistan
Attributes Derived from LIDAR
1.Width2.Radius of Curvature3.Surface Roughness
Lat 35.367 Long 71.545
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Mountain Road Analysis in Laghman25 ft Turning Radius
8.9 foot Vehicle Width
25 ft Turning Radius11.9 foot Vehicle Width
Baseline RG31-A3 Width
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Severely restricted roads due to high risk of collapse
Operational roads with low risk of collapse
Factor of safety between 1 and 2, increase risk of road collapse
A table for rapid assessment of road capacity was created from model runs . The table is considered for inclusion in safety cards and training for MTV drivers.
Criteria color coding defined by ERDC SME Panel
Roadway Collapse
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Cross-Country Analysis
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Process Diagram Soil StrengthAFWA Soil Moisture GRiB
ConvertGrib to Shape
Clip Area
FAO Soil Type Map
Compute Soil Strength
Convert Volumetric MoistureTo Gravimetric Moisture
+
=
0
100
200
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500
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0% 5% 10% 15% 20% 25% 30%Gravimetric Moisture
RCI S
oil S
treng
th
3 Sandy Loam
6 Loam
9 Clay Loam
Assign SoilProperties
0 5 10 Kilometers
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MPH 0-2 2-5 5-1515-3030+
Afghanistan
Pakistan
Kabul
Kandahar
Data attribution with SAR, LIDAR, and weather data emphasizes differences between vehicle performance
Cross-Country Analysis Soil Moisture
RG31-A3Wettest 30-Days
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Jalalabad
RG31-A3Driest 30-Days
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Reduction in Speed Performance due to Increases in Weight
Jalalabad, Afghanistan
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Baseline + 13,500 lbs
Baseline +9000 lbs +10,500 lbs +12,000 lbs +13,500 lbsV10 20.2 16.0 15.2 14.5 13.8V50 15.6 11.9 11.3 10.5 9.6V80 0.0 0.0 0.0 0.0 0.0
% NoGo 27 30 31 32 38
RG31A3, Wet Slippery, Jalalabad, Afghanistan16.00R20 Live Axle
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Route Analysis for Farah, AF
Route 1 (41.4 miles)
Comparison of vehicle performance over a given route larger 16.00R20 tires
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16.00R20 395/85R20
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a. Map showing Duckport Test Site (upper Left).
b. Photo of Duckport Test Site showing approximate boundaries.
Testing to Define Soft-Soil Performance
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RFI requests from Theater Gap Crossing Analysis
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HMMWV Maxpro LAV Route Evaluation
RestrictedMarginalUnrestricted
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Questions?
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