Journal
EARTH SURFACE PROCESSES AND LANDFORMS
Volume 31, Issue 8, Pages 1051-1057Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/esp.1361
Keywords
beach profile; mud-sand beach; Amazon mud banks; French Guiana
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Short-lived collapse features affecting the intertidal sandy profile were observed on mud-rich beaches in Cayenne. They were formed in packets of beach sand accumulating over thick (several metres) fluid to under-consolidated foreshore mud, which adjusts to this sand loading by seaward and longshore migration of fluid mud and subsequent in situ mud dewatering, thus generating subsidence and deformation of the overlying sand sheet. These sandy collapse features required active longshore sand transport and were washed out by wave processes at each rising tide. They finally disappeared permanently as adjustment of the underlying mud enabled stabilization of the beach profile. Copyright (c) 2006 John Wiley & Sons, Ltd.
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