How to translate text using browser tools
1 October 2013 Unusual Barrier/Inlet Behaviour Associated with Active Coastal Progradation and River-Dominated Estuaries
Andrew Green, J. Andrew G. Cooper, Alain LeVieux
Author Affiliations +

Green, A.; Cooper, J.A.G., and LeVieux, A., 2013. Unusual barrier/inlet behaviour associated with active coastal progradation and river-dominated estuaries.

The mesoscale behaviour of unusual barrier inlets on the east coast of South Africa is described. The inlets are associated with river-dominated estuaries and are consequently subject to periodic closure during low river flow. They are also located on a prograding barrier coast. Deflection of the estuary channel of a small river in the direction of longshore transport by 1230 m resulted in its capture by the estuarine channel of a larger river. The larger catchment river was not deflected by coastal progradation but maintained its position by periodic breaching of a channel through the barrier during floods. Flood breaches reseal by landward reworking of ephemeral deltas and may undergo limited migration. A tidal inlet at the northern end of the barrier is maintained by a small tidal prism and has a flood-tidal delta. It exhibits limited lateral migration and closes occasionally when wave-generated sediment transport filling the channel overcomes the flushing ability produced by tidal currents and freshwater discharge by the river. Large swell waves and the development of a washover channel cause the occasional breaching of the barrier, creating an ephemeral inlet midway along the barrier. The position of this breach is likely controlled by wave refraction patterns.

Andrew Green, J. Andrew G. Cooper, and Alain LeVieux "Unusual Barrier/Inlet Behaviour Associated with Active Coastal Progradation and River-Dominated Estuaries," Journal of Coastal Research 69(sp1), 35-45, (1 October 2013).
Received: 3 May 2012; Accepted: 10 December 2012; Published: 1 October 2013
ephemeral inlets
inlet capture
prograding barriers
River dominated estuaries
Get copyright permission
Back to Top