Exploration of Subsidence in Exploration of Subsidence in Orleans - - PowerPoint PPT Presentation

Exploration of Subsidence in Exploration of Subsidence in Orleans Parish Orleans Parish

URPL 969 URPL 969 Applied GI S Workshop: Rethinking Applied GI S Workshop: Rethinking New Orleans after Hurricane Katrina New Orleans after Hurricane Katrina

• Prof. David Hart
• Prof. David Hart

University of Wisconsin University of Wisconsin – – Madison Madison Department of Urban and Regional Planning Department of Urban and Regional Planning May 3, 2006 May 3, 2006 Jared Jared Chapiewsky Chapiewsky Laura Craig Laura Craig Paul Hampton Paul Hampton Oriana Oriana Hull Hull Catrine Catrine Lehrer Lehrer-

• Brey

Brey Hugo Hugo Melikian Melikian Erika Erika Rence Rence Wintford Wintford Thornton Thornton Benjamin Webb Benjamin Webb Ryan Ryan Ziegelbauer Ziegelbauer

Project Goals Project Goals

► ► Explore impact of subsidence

Explore impact of subsidence rates on future building rates on future building

► ► Examine other landscape

Examine other landscape features to find trends features to find trends

► ► Review availability, access,

Review availability, access, and documentation of GIS and documentation of GIS data data

Landscape Variables Landscape Variables

► ► Control Points Stability

Control Points Stability

► ► Soils

Soils

► ► Geology

Geology

► ► Wells

Wells

► ► Land Use

Land Use

► ► Flood Zones

Flood Zones

► ► Faults

Faults

Faults and Subsidence Faults and Subsidence

► ► From,

From, Sherwood M. Gagliano, E. Burton Kemp III, Karen M. Wicker and Kathy S. Wiltenmuth

► ► Active Geological Faults and Land Change in

Active Geological Faults and Land Change in Southern Louisiana Southern Louisiana

Gagliano, Kemp, Wicker and Wiltenmuth, Coastal Environments, Inc.

Gagliano, Kemp, Wicker and Wiltenmuth, Coastal Environments, Inc.

Gagliano, Kemp, Wicker and Wiltenmuth, Coastal Environments, Inc.

Summary of CEI Findings Summary of CEI Findings

► “There is a relationship between faults and land loss. Faults cause land

loss.”

► “Fault movement is the result of linked regional tectonic processes,

which are driven by sediment loading, compaction, salt movement and gravity slumping.”

► “Fault movement changes surface elevation and slope.” ► “Surface features such as wetlands, natural levees, barrier islands,

fastlands, etc., are affected by fault movement.”

► “Rate of vertical movement on active faults ranges from 0.005 to 0.04

ft/yr.”

Gagliano, Kemp, Wicker and Wiltenmuth, Coastal Environments, Inc.

Limitations Limitations

► ► Limited metadata

Limited metadata

► ► Non

Non-

• standard data structures

standard data structures

► ► Geospatial One Stop

Geospatial One Stop

• Increased accessibility and availability

Increased accessibility and availability

• Improve data downloads from web

Improve data downloads from web-

• mapping

mapping

► ►Poor elevation benchmark integrity

Poor elevation benchmark integrity

Future Considerations Future Considerations

► ► Connection between sea level rise and

Connection between sea level rise and subsidence subsidence

► ► Control points, rainfall and tides

Control points, rainfall and tides

► ► Impact of building density and weight

Impact of building density and weight

► ► Impact of wells

Impact of wells

► ► Soils data at greater depth

Soils data at greater depth

► ► Regional subsidence and faults

Regional subsidence and faults