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- W3169100291 abstract "<p>Some beaches regularly experience a rapid decrease in volume due to &#8216;coastal flow slides&#8217;. These events visually resemble subaerial landslides, but are subaqueous and located along river or tidal channels. Along a steeper shoreface, material eroded from the upper beach can be stored in deep water. In some cases, these events can remove thousands of cubic meters (m<sup>3</sup>) of beach sand in a few hours.<br><br>On several occasions in recent years, a flow slide has formed at Seabrook Island, South Carolina (USA). As of January 2021, there have been five events observed since July 2016. Surveys of a January 2017 event show the slide displaced ~25,000 m<sup>3</sup> into deep water (15&#8211;20 m) along North Edisto River Inlet. This volume is comparable to hillside-scale slides observed in mountainous regions like the Blue Ridge, and similar-scale failures have been observed in the Netherlands, France, and Australia (Mastbergen, 2019).<br><br>The Seabrook flow slide is consistently located along a marginal flood channel of a relatively large ebb-dominant inlet, just below a quarrystone revetment protecting an upland development. In this particular location, erosion of the dry beach could cause undermining of the revetment. Historical charts suggest a small inlet was located along this portion of the beach as recently as ~1920. Reviews of available rainfall and water level data suggest exceptional (ie &#8211; near-record daily total) rainfall events and spring tide levels may coincide with observed flow slide events.<br><br>This study analyzes available meteorological, water level, geotechnical, and historical shoreline data to identify mechanisms affecting repeat coastal flow slide events at Seabrook Island (SC). A combination of excessive rainfall, spring tidal currents, and sediment characteristics all appear to affect these events. Because of the unpredictability of these events, and the dynamic nature of the inlet channel adjacent to this portion of the island, it is difficult to observe events in situ and identify specific mechanisms triggering flow slides. While a hard structural solution is unlikely to effectively mitigate the hazard in this location, providing an excess of beach sand may help maintain a shallower shoreface slope and mitigate future flow slides.</p>" @default.
- W3169100291 created "2021-06-22" @default.
- W3169100291 creator A5023808417 @default.
- W3169100291 date "2021-03-04" @default.
- W3169100291 modified "2023-09-24" @default.
- W3169100291 title "What mechanisms trigger coastal flow slides?" @default.
- W3169100291 doi "https://doi.org/10.5194/egusphere-egu21-8397" @default.
- W3169100291 hasPublicationYear "2021" @default.
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