An outflow event on the left side of Hurricane Harvey: Erosion of barrier sand and seaward transport through Aransas Pass, Texas

Goff, John A.; Swartz, J. M.; Gulick, S. P. S.; Dawson, Clint; Alegría-Arzaburu, Amaia Ruíz de

doi:10.1016/j.geomorph.2019.02.038

Cited by 35 publications

(41 citation statements)

References 16 publications

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“…This erosion may result in damage to beach‐front properties and infrastructure, risk to public safety, and disturbance to beach environments and amenity. The present decade has been marked by a number of costly and devastating coastal storm events worldwide; for example the 2010 Xynthia storm that impacted south‐western Europe (Bertin et al, ), the 2013/2014 winter storms that impacted the UK coastline (Masselink et al, ), and Hurricane Harvey in 2017 that caused substantial damage along the Gulf Coast of Texas in the US (Goff et al, ). Often there exists significant spatial variability of the observed erosion and the associated hazards within the storm‐impact zone; some “hotspot” areas may experience severe beach and/or dune erosion, while adjacent areas may appear unaffected (List et al, ; Masselink, Scott, et al, ; Sallenger et al, ; Stockdon et al, ).…”

Section: Introductionmentioning

confidence: 99%

Controls of Variability in Berm and Dune Storm Erosion

et al. 2019

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The erosion impact of large coastal storm events typically occurs across broad (100s of km) sections of coastline and may include significant variability both alongshore and vertically between the berm and dunes. Identifying controls of variability in storm erosion is critical to understanding the response of coastlines to present and changing storminess. This contribution analyses immediate pre‐ and post‐storm Lidar data of over 1700 cross‐shore profile transects, determined at every 100 m alongshore and spanning 400km of the southeast Australian coastline. This unique dataset allowed for a data‐driven Bayesian network analysis of the key relationships between the measured storm erosion response and a range of variables describing the antecedent morphology and hydrodynamic forcing at the coastline. It was found that while erosion of the dune and berm was observed to increase with increased exposure of the local profile to incident storm waves, additional erosion controls were found to be different for these two different sections of the beach. Erosion of the berm was specifically linked to the pre‐storm berm volume, with more accreted berms experiencing a greater proportion of erosion of the overall berm, regardless of variability in forcing conditions. In contrast, dune erosion was equally controlled by the exceedance of wave runup above the antecedent dune toe elevation and the width of the beach immediately fronting the dune, with wider beaches resulting in reduced dune erosion. The results of this large, data‐driven analysis provide important affirmation and insights into the primary controls of berm and dune storm erosion.

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Section: Introductionmentioning

confidence: 99%

Controls of Variability in Berm and Dune Storm Erosion

et al. 2019

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“…Hurricane Carla of 1963 and other major hurricanes are known to have transported sand several kilometres off the Texas coast (Goff, et al, 2010; 2019; Hayes, 1967; McGowen et al, 1970; Morton, 1981; 2002; Snedden et al, 1988). Clearly, offshore sand transport during storms has been an important process, but there is no evidence for an increase in storm frequency in the region during the late Holocene, although the sedimentary record of storm activity does not include the time interval of the most recent progradation (Wallace & Anderson, 2010).…”

Section: Discussionmentioning

confidence: 99%

Holocene progradation and retrogradation of the Central Texas Coast regulated by alongshore and cross‐shore sediment flux variability

Odezulu

Swanson

Anderson

2020

The Depositional Record

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Fifteen transects of sediment cores located off the central Texas coast between Matagorda Peninsula and North Padre Island were investigated to examine the offshore record of Holocene evolution of the central Texas coast. The transects extend from near the modern shoreline to beyond the toe of the shoreface. Lithology, grain size and fossil content were used to identify upper shoreface, lower shoreface, ebb‐tidal delta and marine mud lithofacies. Interpretations of these core transects show a general stratigraphic pattern across the study area that indicates three major episodes of shoreface displacement. First, there was an episode of shoreface progradation that extended up to 5 km seaward. Second, an episode of landward shoreline displacement is indicated by 3–4 km of marine mud onlap. Third, the marine muds are overlain by shoreface sands, which indicates another episode of shoreface progradation of up to 5 km seaward. Radiocarbon ages constrain the onset of the first episode of progradation to ca 6.5 ka, ending at ca 5.0 ka when the rate of sea‐level rise slowed from an average rate of 1.6–0.5 mm/yr. Results from sediment budget calculations and sediment transport modelling based on reasonable estimates of an ancient shoreline shape and wave climate indicate that the first progradation was a result of sand supplied from erosion of the offshore Colorado and Rio Grande deltas. The transgressive phase occurred between ca 4.9 ka and ca 1.6 ka and coincided with a major expansion of the Texas Mud Blanket, which resulted in burial of offshore sand sources and the shoreface being inundated with mud. The second, more recent episode of shoreface progradation began ca 500 years ago with a maximum rate of ca 6 m/yr. This most recent change signals a healing phase of coastal evolution from the late Holocene transgressive event. Currently, the shoreline along the central Texas coast is retreating landward at an average rate of 0.30 m/yr, indicating that the second progradation event has ended.

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“…This seems to have been exacerbated by the fast runoff and poor infiltration of the town as well as by the mesoscale convective systems typical of built areas. A study of sediment transport and bathymetry on coastal bays south of Houston at Port Aransas indicates a significant seaward displacement of sand with removal from barrier islands and deposition on the inner shelf ( Goff et al, 2019 ). This is contrary to the usual concept of storm-driven, landward migration of barrier islands through wave-driven erosion of the shoreface and wash-over deposition on the bay ( Goff et al, 2019 ).…”

Section: Recent Disastersmentioning

confidence: 99%

Natural Hazards, Landscapes and Civilizations

Leroy

2022

Treatise on Geomorphology

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An outflow event on the left side of Hurricane Harvey: Erosion of barrier sand and seaward transport through Aransas Pass, Texas

Cited by 35 publications

References 16 publications

Controls of Variability in Berm and Dune Storm Erosion

Controls of Variability in Berm and Dune Storm Erosion

Holocene progradation and retrogradation of the Central Texas Coast regulated by alongshore and cross‐shore sediment flux variability

Natural Hazards, Landscapes and Civilizations

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