analysis of the geologic context of maintenance costs for ......‐landslide inventory • geology...
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Analysis of the geologic context of maintenance costs for rockfalls, landslides, and sinkholes in Kentucky
Bethany OverfieldDan Carey
Jerry WeisenfluhRebecca Wang
Kentucky Geological Survey
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Overview
•Landslide/rockfall prone areas in Kentucky‐Landslide inventory
• Geology of Kentucky‐obvious correlation between geology and landslide\rockfall occurrence
• Maintenance Cost Database Project: 3‐year project funded by Kentucky Transportation Cabinet
‐Phase I: data manipulation
‐Phase II: field investigations
‐Phase III: statistical analysis of data, creation of a map product for eachdistrict.
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Landslides in Kentucky
Landslide inventory map of Kentucky ( as of 07/2011)
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Geology of Kentucky
Pennsylvanian: coal-bearing sequences
Ordovician: carbonate sequences, shale
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Geology of Kentucky: shale distribution
Shale: the main culprit
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Road distribution
Road distribution: colored roads are interstates and parkways.
They are evenly distributed throughout the state, therefore there are a number of roadways in landslide‐prone areas.
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Maintenance Cost Database Project
Objective: assess the geologic context of landslide and rockfall maintenance costs along Kentucky roadways
Data: ‐derived from the Kentucky Transportation Cabinet (KYTC) Operations Maintenance System, a database of maintenance activities derived from district work orders (2002‐2009)
Phase I (completed): ‐ converted tabular data into GIS format in order to analyze costs geospatially
Phase II: (completed)‐ investigated the context of landslide and rockfall costs in the field
Phase III (in progress): ‐ statistical analysis of data, creation of a map product for each district
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Maintenance Project: Phase I‐Project started with acquiring all KYTC work orders involving landslides and rockfalls
‐Maintenance costs include the cleaning up of rocks in the roadway and dressing/stabilizing roadcuts ONLY.
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Maintenance Project: Phase I
Two types of cost data from the KYTC:
County data:
‐general costs weresummarized by county.‐no site specific location
Site specific data: ‐defined by mile marker.
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Maintenance Project: Phase I
Derived from county data:
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Derived from county data:
Maintenance Project: Phase I
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Maintenance Workorder Processing
Milepoint 15.5 to 22.0$4,250
16 17 18 19 20 21 22
$654 $654 $654 $654 $654 $654$327
For site specific data, a monetary value was assigned to each mile. This was done using GIS (linear referencing).
Maintenance Project: Phase I
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Landslide locations by segment. One year.2008‐2009
GIS end product: one‐mile line segments with summed costs of site specific data.
Maintenance Project: Phase I
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Rockfall locations by segment. One year.2008‐2009
Maintenance Project: Phase I
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From the maps, tabular data was creating using site specific data:
Maintenance Project: Phase I
Rockfall and landslide costs per year.
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Analyzed spatial context of cost data to identify areas of high cost/high occurrence.
•Identified:a set of field study areas focusing on sites where repeated maintenance was common. **These sites were not necessarily the biggest and most visually impressive**
• Investigated:the geology, hydrogeology, and land‐use in order to surmise what the recurring problem was at each site.
• Initiated: a data collection standard that can be used to assess sites (which entailed creating an inventory form that can be used for each site).
Maintenance Project: Phase II
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Phase II: What is the data telling us?
‐KYTC work orders do not contain information about context ofdisturbance
‐Landslide/Rockfall site investigations were to be done
‐Started by looking at the data:
Interested in: ‐magnitude of cost of maintenance‐frequency of occurrence of maintenance
Maintenance Project: Phase II
# of times site has been maintained
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Phase II field investigation: rockfalls
Magoffin County
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Meade County
Most rockfall sites have been cleared but evidence of rockfalls exist.
Phase II field investigation: rockfalls
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Meade County
Phase II field investigation: landslides
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Breathitt County (eastern Kentucky)These are often repeat offenders.Proximity to streams an issue.
Phase II field investigation: landslides
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Meade County
Phase II field investigation: landslides
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Breathitt County
Phase II field investigation: landslides
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After many field visits, the following became parameters of interest:
bedrock: lithology, weathering, structure, fractures
hydrology: groundwater, surface water
topography: slope angle, landscape context
disturbance: anthropogenic, geomorphic, seismic
road usage: type of traffic, frequency of traffic
Phase II: parameters of interest in the field
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Phase II: Field Assessment Inventory form—part 1
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Phase II: Field Assessment Inventory form—part 2
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The ultimate goal is to relate maintenance costs to geologic conditions.
KGS met with KYTC and KTC to get input from them concerning the most useful deliverables and we are currently working with them on those now.
Deliverables include:● geologically‐based maps (by KYTC district) highlighting maintenance costs
‐intersect one‐mile cost segments with geology data to analyze data based on mapped stratigraphic units.
● report including statistical analysis relating geology to costs.
Maintenance Project: Phase III
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Phase III: Map prototype by district
Average $Cost per Mile Segment Repaired, by Geologic Unit:
Total Cost per Road Segment ($), 2002-2009:
Highest Total Road, Highest Rockfall, and Highest Landslide Road Costs/Work Orders tables:
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Phase III: Statistical analysis (by district)C
ost
Formation
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Questions?
We’ll be able to report back on the completion of Phase III next year!