A5076713154- Geological formations and processes
- Geology and Paleoclimatology Research
- Coastal and Marine Dynamics
- Coastal wetland ecosystem dynamics
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Hydrology and Sediment Transport Processes
- Tropical and Extratropical Cyclones Research
- Archaeology and ancient environmental studies
- Oceanographic and Atmospheric Processes
- Maritime and Coastal Archaeology
- Coastal and Marine Management
- Hydrocarbon exploration and reservoir analysis
- Hydraulic Fracturing and Reservoir Analysis
- Geological Modeling and Analysis
- Aeolian processes and effects
- Isotope Analysis in Ecology
- Marine and environmental studies
- Flood Risk Assessment and Management
- Underwater Acoustics Research
- Cryospheric studies and observations
- earthquake and tectonic studies
- Geological and Geophysical Studies
- Geochemistry and Geologic Mapping
- Pleistocene-Era Hominins and Archaeology
Tulane University
2016-2025
The University of Texas at Austin
2007
Saint Anthony College of Nursing
2007
University of Minnesota
2007
University of Illinois Urbana-Champaign
2007
Louisiana State University
2007
University of Illinois Chicago
2000-2004
University of Nebraska–Lincoln
2000
Utrecht University
1990-1999
Abstract Coastal Louisiana has lost about 5,000 km 2 of wetlands over the past century and concern exists whether remaining will persist while facing some world’s highest rates relative sea-level rise (RSLR). Here we analyse an unprecedented data set derived from 274 rod surface-elevation table-marker horizon stations, to determine present-day change, vertical accretion shallow subsidence rates. Comparison with RSLR at land surface (present-day are 12±8 mm per year) shows that 65% in...
Determining the rates, mechanisms, and geographic variability of relative sea-level (RSL) change following Last Glacial Maximum (LGM) provides insight into sensitivity ice sheets to climate change, response solid Earth gravity field ice-mass redistribution, constrains statistical physical models used project future rise. To do so in a scientifically robust way requires standardized datasets that enable broad spatial comparisons minimize bias. As part larger goal develop unified,...
While there is evidence for an acceleration in global mean sea level (MSL) since the 1960s, its detection at local levels has been hampered by considerable influence of natural variability on rate MSL change. Here we report a tide gauge records along U.S. Southeast and Gulf coasts that led to rates (>10 mm yr-1 2010) are unprecedented least 120 years. We show this primarily induced ocean dynamic signal exceeding externally forced response from historical climate model simulations. However,...
Abstract Several coastal ecosystems—most notably mangroves and tidal marshes—exhibit biogenic feedbacks that are facilitating adjustment to relative sea-level rise (RSLR), including the sequestration of carbon trapping mineral sediment 1 . The stability reef-top habitats under RSLR is similarly linked reef-derived accumulation vertical accretion protective coral reefs 2 persistence these ecosystems high rates contested 3 Here we show probability inferred from palaeo-stratigraphic...
Radiocarbon measurements by accelerator mass spectrometry relating to three of the four late Holocene Mississippi River subdeltas yielded consistent results and were found differ up 2000 carbon-14 years from previously inferred ages. These geological data are in agreement with archaeological stratigraphic ages based on ceramic seriation used develop a revised chronologic framework, which has implications for prehistoric human settlement patterns, coastal evolution wetland loss,...
Abstract River avulsions are commonly considered to be driven by the aggradation and growth of alluvial ridges, associated increase in cross‐valley slope relative either down‐channel or down‐valley (the latter is termed ratio present paper). Therefore, spatial patterns overbank rate over stratigraphically relevant time scales critical avulsion‐dominated models architecture. Detailed evidence on centennial‐ millennial‐scale floodplain deposition has, date, been largely unavailable. New data...
Research Article| July 01, 2004 Deciphering Holocene sea-level history on the U.S. Gulf Coast: A high-resolution record from Mississippi Delta Torbjörn E. Törnqvist; Törnqvist 1Department of Earth and Environmental Sciences, University Illinois at Chicago, 845 West Taylor Street, 60607-7059, USA Search for other works by this author on: GSW Google Scholar Juan L. González; González Lee A. Newsom; Newsom 2Department Anthropology, Pennsylvania State University, Park, 16802-3404, Klaas van der...
Research Article| December 01, 2009 Spatial variability of late Holocene and 20th century sea-level rise along the Atlantic coast United States Simon E. Engelhart; Engelhart * 1Department Earth Environmental Science, University Pennsylvania, 240 South 33rd Street, Philadelphia, Pennsylvania 19104, USA *E-mails: simoneng@sas.upenn.edu; bphorton@sas.upenn.edu. Search for other works by this author on: GSW Google Scholar Benjamin P. Horton; Horton Bruce C. Douglas; Douglas 2International...
Research Article| October 01, 2015 Episodic overbank deposition as a dominant mechanism of floodplain and delta-plain aggradation Zhixiong Shen; Shen 1Department Earth Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA *Current address: Department Marine Science, Coastal Carolina 301 Allied Drive, Conway, South 29526, USA; zshen@coastal.edu. Search for other works by this author on: GSW Google Scholar Torbjörn E. Törnqvist; Törnqvist...
Coastal marshes are threatened by relative sea-level (RSL) rise, yet recent studies predict marsh survival even under the high rates of RSL rise expected later in this century. However, because these mostly based on short-term records, uncertainty persists about longer-term vulnerability coastal marshes. We present an 8500-year-long record from Mississippi Delta, showing that at exceeding 6 to 9 mm year-1, conversion into open water occurs 50 years. At ~3 drowning within a few centuries....
Prehistoric rates of land gain in a large portion the Mississippi Delta are significantly outpaced by present-day loss.
Abstract Tides tend to widen deltaic channels and shape delta morphology. Here we present a predictive approach assess priori the effect of fluvial discharge tides on channels. We show that downstream channel widening can be quantified by ratio tide‐driven discharge, along with second metric representing flow velocities. A test our new theory selection 72 deltas globally shows good correspondence wide range environments, including wave‐dominated deltas, river‐dominated alluvial estuaries. By...
Recent studies have produced conflicting results as to whether coastal wetlands can keep up with present-day and future sea-level rise. The stratigraphic record shows that threshold rates for wetland submergence or retreat are lower than what instrumental records suggest, extent shrinks considerably under high of These apparent conflicts be reconciled by recognizing many still possess sufficient elevation capital cope rise, processes like sediment compaction, ponding, wave erosion require...
Abstract Predicting climate impacts is challenging and has to date relied on indirect methods, notably modeling. Here we examine coastal ecosystem change during 13 years of unusually rapid, albeit likely temporary, sea-level rise ( > 10 mm yr −1 ) in the Gulf Mexico. Such rates, which may become a persistent feature future due anthropogenic change, drove rising water levels similar magnitude Louisiana’s wetlands. Measurements surface-elevation at 253 monitoring sites show that 87% these...
We made a comparative study of AMS 14 C ages organic deposits (minerotrophic peats and gyttjas) macrofossils in order to evaluate the magnitude number sources error that may be present bulk sediment samples. The consistency found for coexisting suggests they are unlikely record disturbances. Some our gyttja samples yielded an age 0.2–0.6 ka years too old due hardwater effect. also aging effect several with high admixture siliciclastic material; this is attributed fluvial input reworked,...
Research Article| August 01, 1994 Middle and late Holocene avulsion history of the River Rhine (Rhine-Meuse delta, Netherlands) Torbjörn E. Törnqvist 1Department Physical Geography, Utrecht University, P.O. Box 80115, NL-3508 TC Utrecht, Netherlands Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Geological Society America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print 0091-7613 Geology (1994) 22 (8): 711–714....
Holocene anastomosing fluvial systems have been described from a wide variety of environments, which usually in common the presence rapidly rising base level. Although it has suggested that this style can be expected coastal areas and adjacent inland influenced by rapid sea-level rise, few such reported. The occurrence alternating meandering Rhine-Meuse Delta (central Netherlands) is discussed here. It shown two styles not only distinctive plan morphology but also identified on basis...
Research Article| August 01, 2006 How stable is the Mississippi Delta? Torbjörn E. Törnqvist; Törnqvist 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Search for other works by this author on: GSW Google Scholar Scott J. Bick; Bick 2Department University Illinois at Chicago, 845 West Taylor Street, 60607-7059, Klaas van der Borg; Borg 3Robert Van de Graaff Laboratory, Utrecht P.O. Box 80000, NL-3508 TA...
Research Article| July 01, 1999 Holocene century-scale temperature variability from West Greenland lake records Nico W. Willemse; Willemse 1The Netherlands Centre for Geo-ecological (ICG), Faculty of Geographical Sciences, Utrecht University, P.O. Box 80115, NL-3508 TC Utrecht, Search other works by this author on: GSW Google Scholar Torbjörn E. Törnqvist Author and Article Information Publisher: Geological Society America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print 0091-7613...