Subsidence and Coastal Geomorphic Change in Central Louisiana · Chandeleur Is. Geomorphic Change...
Transcript of Subsidence and Coastal Geomorphic Change in Central Louisiana · Chandeleur Is. Geomorphic Change...
U.S. Department of the Interior U.S. Geological Survey
Subsidence and Coastal Geomorphic Change in Central Louisiana
Jack Kindinger
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
2014 Underground Injection Control Conference Aquifer Management & Underground Injection New Orleans, LA January 21-23, 2014
Subsidence and Land Loss in Louisiana
>5000 km2
Subsidence and Land Loss in Louisiana From the Louisiana’s Comprehensive Master Plan for a Sustainable Coast (CPRA 2012)
Subsidence and Land Loss in Louisiana
Subsidence rates vary in space, potentially over very short
distances (e.g., tens of meters)
Subsidence rates can vary through time, depending on the driving processes
Subsidence rates vary as a function of depth; the nature of this function can vary substantially across space (rates are always highest at the surface!)
Subsidence Rates Are Highly Variable
Subsidence and Land Loss in Louisiana
Growth Fault Systems Deep-basin Salt Migration Sediment Loading and Glacial Isostatic Adjustment
(GIA)
Physical Processes Driving Subsidence
Processes + sea-level rise = land loss (Plus extreme storms)
Deltaic Sediment Compaction Anthropogenic Fluid Withdrawal Surface Water Drainage And Management
Subsidence and Land Loss in Louisiana
Relative Ranges and Rates of Subsidence by Physical Processes
Delta Sediment Compaction
Delta Construction and Collapse Sequence
Delta Sediment Compaction
Delta Geology
Anthropogenic Fluid Withdrawal
Close temporal and spatial correlation between rates of wetland loss, subsidence, and onshore hydrocarbon production
Morton and others, 2006
Anthropogenic Fluid Withdrawal
Morton and others, 2005
National Geodetic Survey
Areas of highest average subsidence rates (> 12 mm/yr; hatched pattern)
Surface Water Drainage And Management
Historic Practices: Dredging the marsh
Surface Water Drainage And Management
The Mississippi River diversion at Caernarvon
Mississippi River Diversions
Geomorphic Change
(Kindinger and others, 2013)
Geomorphic Change
(Kindinger and others, 2013)
Bayou Lafourche Isle Dernieres
Chandeleur Is.
Geomorphic Change http://www.climate.gov/sites/default/files/LandLossinSouthernLouisiana1932_HR.jpg
http://www.climate.gov/sites/default/files/LandLossinSouthernLouisiana2011_HR.jpg
Bayou Lafourche
1932
2011
Geomorphic Change
(Kindinger and others, 2013)
Historical Shoreline Positions Isle Dernieres from 1887 to 2005
1887 to 1934
1934 to 1996
1996 to 2004
1887 to 2005
2004 to 2005
Geomorphic Change
(Kindinger and others, 2013)
Subsidence and New Orleans
Subsidence and New Orleans InSar Velocity Map
Dixon, 2006
Questions?