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GEOPHYSICAL RESEARCH LETTERS,
VOL. 34,
L16303,
doi:10.1029/2007GL030003,
2007
Post-glacial sediment load and subsidence in coastal Louisiana
Erik R. Ivins
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
Roy K. Dokka
Center for GeoInformatics and Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge,
Louisiana, USA
Ronald G. Blom
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
Abstract
Sea level rise in the Gulf of Mexico has occurred at a rate of 1.8–2.2 mm/yr during the 20th century, or nearly the same as
observed globally due to combined steric and water mass changes. Tide gauges in coastal Louisiana, however, record a substantially
larger rate of rise and while a number of causal mechanisms may be responsible, their specific contribution is poorly understood.
Using a realistic viscoelastic Earth model, detailed geologic parameters for south Louisiana and new GPS data, we demonstrate
that Holocene sedimentary loading in the Gulf and Mississippi River delta is capable of contributing to 1–8 mm/yr of subsidence
over areas of 30–0.75 × 103 km2.
Received 13
March
2007;
accepted 17
July
2007;
published 17
August
2007.
Keywords: coastal processes;
rheology mantle;
sedimentary loading.
Index Terms: 1211 Geodesy and Gravity: Non-tectonic deformation; 1641 Global Change: Sea level change (1222, 1225, 4556); 1861 Hydrology: Sedimentation (4863); 8162 Tectonophysics: Rheology: mantle (8033).
Read Full Article (file size: 678951 bytes) Cited by
Citation: Ivins, E. R., R. K. Dokka, and R. G. Blom
(2007),
Post-glacial sediment load and subsidence in coastal Louisiana,
Geophys. Res. Lett.,
34,
L16303,
doi:10.1029/2007GL030003.
Copyright 2007 by the American Geophysical Union.
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