The Right Tool for the Job: The North Carolina Geological Survey’s Landslide Hazard Maps Jennifer B. Bauer, L.G. Appalachian Landslide Consultants, PLLC.

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Presentation transcript:

The Right Tool for the Job: The North Carolina Geological Survey’s Landslide Hazard Maps Jennifer B. Bauer, L.G. Appalachian Landslide Consultants, PLLC Co-Authors/Former NCGS Landslide Mapping Team: Rick Wooten, Anne Witt, Ken Gillon, Tommy Douglas, Stephen Fuemmeler

The Tool III. Map Distribution and Public Outreach NCGS Landslide Mapping Program II. Create Landslide Hazard Mapping Products I. Develop Landslide Inventory

I. Landslide Inventory Aerial Photographs LiDAR Field Verification Watauga Buncombe Henderson Macon 3,294 3,251

I. Landslide Inventory Remote Sensing and Field Verification 2005 orthophoto and 1940 aerial photo LiDAR DEM Field Work

I. Landslide Inventory Slope Movement – Slope Movement Deposit Geodatabase Information collected includes: Location Data Damage/Movement History Geomorphic Data Rock Information Soil data Site Hydrology

Stability Index Map – where landslides might start Potential Debris Flow Pathways Map – where landslides might go II. Landslide Hazard Mapping Products Slope Movements - Slope Movement Deposits Map– where landslides have occurred or are occurring.

II. Landslide Hazard Mapping Products Slope Movement – Slope Movement Deposits Map Slope movement deposit Slope movement initiation zone Slope movement outlines BRP 421

BRP II. Landslide Hazard Mapping Products Stability Index Map (SINMAP) SINMAP Program by Pack et al. 1998

421 BRP II. Landslide Hazard Mapping Products Stability Index Map (SINMAP)

II. Landslide Hazard Mapping Products Potential Debris Flow Pathways Mapped debris flow pathways Potential debris flow pathways Past debris flow activity (deposits) No known past or potential debris flow activity Hydrologic Flow paths generated from high hazard SINMAP zones using LiDAR DEM & Streambed Mapping Includes mapped debris flow pathways and deposits Decreasing Relative Hazard Increasing

Data delivered to Counties for use in County GIS Online Landslide Map Viewer Invited Presentations Public Inquiries Emergency Response III. Map Distribution and Public Outreach

The Job Property protection Proper construction Development planning and design Structure siting Public Safety

Property Protection – Known Landslide Problem Areas 1940 aerial photo2005 orthophotograph with 1940 tracks and initiation points

Proper Construction - Known Landslide Deposits Unconsolidated material Groundwater seeps and springs

Development Planning and Design - Landslide Hazard Zones Parcel-group scale

Structure Siting – Potential Debris Flow Pathways Set backs Starnes Cove Buncombe County Ivan Sept. 16, 2004

Public Safety Hazard Map Series ID areas that need site specific evaluation

The Job The Right Tool for the Job

Questions? Jennifer Bauer, L.G. Appalachian Landslide Consultants, PLLC