Wave forecasting and longshore sediment transport gradients along a transgressive barrier island: Chandeleur Islands, Louisiana

Georgiou, Ioannis Y.; Schindler, Jennifer

doi:10.1007/s00367-009-0165-3

Cited by 23 publications

(8 citation statements)

References 13 publications

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“…Most of this sediment redistribution can be attributed to strong southerly long-shore transport during the winter storms and the passage of tropical storms and hurricanes. Another study on barrier island erosional patterns, conducted on the Chandeleur Islands, Louisiana, supports the analysis that shoreline erosion and sediment transport are greatly influenced by changing wind and wave energy as a result of hurricanes and winter storms [15]. Additionally, a study conducted on a Dutch barrier island further backs this analysis that sediment transport on barrier islands is highly impacted by storm frequency [16].…”

Section: Discussionmentioning

confidence: 61%

Geomorphologic Recovery of North Captiva Island from the Landfall of Hurricane Charley in 2004

Kelly

Jose

2021

Geosciences

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Hurricane Charley made landfall on the Gulf Coast of Florida on 13 August 2004 as a category 4 hurricane, devastating North Captiva Island. The hurricane caused a breach to occur to the southern end of the island, which naturally healed itself over the course of three years. By 2008, the cut was completely repaired geomorphologically. LiDAR data analysis shows the northern half of the island has been subjected to persistent erosion from 1998–2018, while the southern half experienced accretion since 2004, including the complete closure of the “Charley cut”. The maximum volume of sediment erosion in the northern sector of the island (R71–R73) from 2004–2018 was −85,710.1 m3, which was the source of southern accretion. The breached area of the island (R78b–R79a) obtained 500,163.9 m3 of sediments from 2004–2018 to heal the cut made by Hurricane Charley. Along with LiDAR data analysis, Google Earth Pro historical imageries and SANDS volumetric analysis confirmed the longshore transport of sediments from the northern to the southern end of the island. Winter storms are mainly responsible for this southerly longshore transport and are hypothesized to be the main factor driving the coastal dynamics that restored the breach and helps in widening the southern end of North Captiva Island.

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Section: Discussionmentioning

confidence: 61%

Geomorphologic Recovery of North Captiva Island from the Landfall of Hurricane Charley in 2004

Kelly

Jose

2021

Geosciences

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“…This depocenter (D2) is comparable to the average LST rate of 1 × 10 6 m 3 /yr determined for this coast (Vespremeanu‐Stroe, ; Dan et al ., ), but this does not imply though that all the sediments transported alongshore get trapped and deposited directly into the breach. The breach may be preferentially fed by beach drift and longshore currents acting at lower depths, whereas, during storms, large areas of the lower shoreface are activated, subjecting the bed to applied shear stresses (Georgiou and Schindler, , ), and creating conditions favorable for the LST to partially bypass the breach inlet.…”

Section: Discussionmentioning

confidence: 99%

The formation and closure of the Big Breach of Sacalin spit associated with extreme shoreline retreat and shoreface erosion

Zăinescu

Vespremeanu‐Stroe

Tătui

2019

Earth Surf Processes Landf

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We document a case of exceptionally large natural breaching of a sandy spit (Sacalin spit, Danube Delta) using multiannual to seasonal surveys of topography and bathymetry on successive cross-barrier and shoreface profiles, LiDAR data, satellite imagery, and wind and wave data.The large breach, which quickly reached 3.4 km in May 2014, is attributed to morphological preconditioning of the narrow (50-150 m) barrier, which was susceptible to breaching even during moderate storm conditions. The event switched the barrier's decadal evolution from low cross-shore transport to high cross-shore transport over the barrier, which is an order of magnitude larger than during the non-breach period. Upper shoreface erosion, as indicated by the extensive erosion down to À4 m, indicates that this zone is a significant source for the rebuilding of the barrier. Barrier recovery and widening trigger a negative feedback which limits the back-barrier sediment transfer. As a result, back-barrier deposition decreases whilst the barrier aggradation through overwash becomes more frequent.The Big Breach (TBB) closed naturally in three years. The very high deposition rate of sediment in the breach is a testimony of the high sediment volumes supplied by the longshore transport and the high sediment released through shoreface retreat, and resulted in widening the barrier to a maximum of 1 km. Since the newly-formed barrier shoreline retreated 500 m, this reveals that barrier breaching is an important mechanism which significantly accelerates the landward migration of the barrier system and is a proof of the highly non-linear morphodynamics involved in the barrier island translation.

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“…A sediment transport nodal point occurs on the south-central part of the Chandeleur Island chain (Figure 4; Ellis and Stone 2006;Georgiou, FitzGerald, and Stone, 2005;Georgiou and Schindler, 2009;Miner et al 2009b). In the Chandeleurs, prior to Hurricane Katrina, the southern islands were largely armored with shell hash without much sand for transport (Penland, Suter, and Boyd, 1985).…”

Section: Province I: Chandeleur Islands and Mississippi River Delta Eastmentioning

confidence: 94%

Regional Sediment Processes, Sediment Supply, and their Impact on the Louisiana Coast

Morang¹,

Rosati²,

King³

2013

Journal of Coastal Research

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Wave forecasting and longshore sediment transport gradients along a transgressive barrier island: Chandeleur Islands, Louisiana

Cited by 23 publications

References 13 publications

Geomorphologic Recovery of North Captiva Island from the Landfall of Hurricane Charley in 2004

Geomorphologic Recovery of North Captiva Island from the Landfall of Hurricane Charley in 2004

The formation and closure of the Big Breach of Sacalin spit associated with extreme shoreline retreat and shoreface erosion

Regional Sediment Processes, Sediment Supply, and their Impact on the Louisiana Coast

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