scholarly journals Louisiana Coastal Zone sediment characterization; Comparison of sediment grain sizes for samples collected in 2008 and 2015–2016 from the western Chenier plain to the Chandeleur Islands, Louisiana—Louisiana Barrier Island Comprehensive Monitoring (BICM) Program

2019 ◽  
Author(s):  
Stephen T. Bosse ◽  
James G. Flocks ◽  
Julie C. Bernier ◽  
Ioannis Y. Georgiou ◽  
Mark A. Kulp ◽  
...  
Keyword(s):  
Coastal Zone ◽  
Barrier Island ◽  
Chenier Plain ◽  
Grain Sizes ◽  
Chandeleur Islands

The potential for sea-level-rise-induced barrier island loss: Insights from the Chandeleur Islands, Louisiana, USA

2014 ◽  
Vol 355 ◽  
pp. 244-259 ◽  
Author(s):  
Laura J. Moore ◽  
Kiki Patsch ◽  
Jeffrey H. List ◽  
S. Jeffress Williams
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Barrier Island ◽  
Chandeleur Islands

scholarly journals Investigating Controls on Barrier Island Overwash and Evolution during Extreme Storms

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2829
Author(s):  
Jesse N. Beckman ◽  
Joseph W. Long ◽  
Andrea D. Hawkes ◽  
Lynn A. Leonard ◽  
Eman Ghoneim
Keyword(s):  
Satellite Imagery ◽  
Pressure Sensors ◽  
Barrier Island ◽  
Water Levels ◽  
Sediment Grain Size ◽  
Grain Sizes ◽  
Elevation Data ◽  
Directional Wave ◽  
Spatially Varying ◽  
Sentinel 2

Over short periods of time, extreme storms can significantly alter barrier island morphology, increasing the vulnerability of coastal habitats and communities relative to future storms. These impacts are complex and the result of interactions between oceanographic conditions and the geomorphic, geological, and ecological characteristics of the island. A 2D XBeach model was developed and compared to observations in order to study these interactions along an undeveloped barrier island near the landfall of Hurricane Florence in 2018. Beachface water levels during the storm were obtained from two cross-shore arrays of pressure sensors for comparison to model hydrodynamics. Aerial drone imagery was used to derive pre-storm and post-storm elevation data in order to quantify spatially varying erosion and overwash. Sediment grain size was measured in multiple locations, and we estimated spatially varying friction by using Sentinel-2 satellite imagery. The high spatial and temporal resolution of satellite imagery provided an efficient method for incorporating pre-storm spatially varying land cover. While previous studies have focused on the use of spatially varying friction, we found that the utilization of local median grain sizes and full directional wave spectra was critical to reproducing observed overwash extent.

scholarly journals Inundation of a barrier island (Chandeleur Islands, Louisiana, USA) during a hurricane: Observed water‐level gradients and modeled seaward sand transport

2014 ◽  
Vol 119 (7) ◽  
pp. 1498-1515 ◽  
Author(s):  
Christopher R. Sherwood ◽  
Joseph W. Long ◽  
Patrick J. Dickhudt ◽  
P. Soupy Dalyander ◽  
David M. Thompson ◽  
...  
Keyword(s):  
Water Level ◽  
Barrier Island ◽  
Sand Transport ◽  
Chandeleur Islands

scholarly journals Upper Triassic-Lower Jurassic tidal deposits of the Gassum Formation on Sjælland, Denmark

1989 ◽  
Vol 23 ◽  
pp. 1-30
Author(s):  
Lars Henrik Nielsen ◽  
Flemming Larsen ◽  
Nils Frandsen
Keyword(s):  
Coastal Zone ◽  
Principal Part ◽  
Facies Analysis ◽  
Barrier Island ◽  
Lower Jurassic ◽  
Upper Triassic ◽  
Coarse Grained ◽  
Deep Wells ◽  
The Subject ◽  
Petrophysical Logs

Three deep wells on the Danish island of Sjælland penetrate the Upper Triassic - Lower Jurassic Gassum Formation. The formation has been the subject of a facies analysis of cored sediments and interpretation of petrophysical logs. The principal part of the work presented is based on data from the Stenlille-1 well. The sediments were deposited in a NW-SE trending, microto mesotidal, prograding coastal zone and the adjacent fluvial hinterland. In the Stenlille-1 well, the coastal progradation is recorded as a thick, coarse-grained sandstone unit deposited within a barrier island complex. This basal part of the formation is overlain by four stacked regressive sequences consisting of finegrained sandstones and mudstones deposited on tidal flats. A thin transgressive sandstone sheet terminates the formation and marks the boundary to marine claystones of the Fjerritslev Formation.

Reflection electron microscopy of as-grown diamond surfaces

1993 ◽  
Vol 51 ◽  
pp. 1006-1007
Author(s):  
Z.L. Wang ◽  
J. Bentley ◽  
R.E. Clausing ◽  
L. Heatherly ◽  
L.L. Horton
Keyword(s):  
Electron Microscopy ◽  
Synthetic Diamond ◽  
High Energy ◽  
Dark Field ◽  
Reverse Direction ◽  
Diamond Surfaces ◽  
Grain Sizes ◽  
Synthetic Diamonds ◽  
De Beers ◽  
Reflection Electron Microscopy

It has been found that the abrasion of diamond-on-diamond depends on the crystal orientation. For a {100} face, the friction coefficient for sliding along <011> is much higher than that along <001>. For a {111} face, the abrasion along <11> is different from that in the reverse direction <>. To interpret these effects, a microcleavage mechanism was proposed in which the {100} and {111} surfaces were assumed to be composed of square-based pyramids and trigonal protrusions, respectively. Reflection electron microscopy (REM) has been applied to image the microstructures of these diamond surfaces.{111} surfaces of synthetic diamond:The synthetic diamonds used in this study were obtained from the De Beers Company. They are in the as-grown condition with grain sizes of 0.5-1 mm without chemical treatment or mechanical polishing. By selecting a strong reflected beam in the reflection high-energy electron diffraction (RHEED) pattern, the dark-field REM image of the surface is formed (Fig. 1).

Investigation of Morphosedimentary Processes on a Schematic Louisiana Barrier Island Using Process-Based Numerical Modeling

2007 ◽  
Author(s):  
T. Campbell ◽  
B. de Sonneville ◽  
L. Benedet ◽  
D. J. W. Walstra ◽  
C. W. Finkl
Keyword(s):  
Numerical Modeling ◽  
Barrier Island
Sign in / Sign up

Export Citation Format

Share Document