Sediment Dynamics of Barriers with Frequent Overwash

Autor:	Brad Morris, Óscar Ferreira, João Alveirinho Dias, Ana Vila-Concejo, Ana Matias
Rok vydání:	2009
Předmět:	Hydrology geography geography.geographical_feature_category Ecology Berm Sediment Inlet Barrier island Aeolian processes Sample collection Overwash Geology Earth-Surface Processes Water Science and Technology Swash
Zdroj:	Journal of Coastal Research. 253:768-780
ISSN:	1551-5036 0749-0208
DOI:	10.2112/08-1032.1
Popis:	The objective of this work is to determine the relative importance of different processes (swash, overwash, aeolian, and lagoon) affecting sediment dynamics in barriers with frequent overwash. Aerial photographs, topographic surveys (with real-time kinematic global positional system), and sample collection were undertaken on Barreta Island (Ria Formosa barrier islands, Portugal). Wave and tidal data were also analysed during a 3-year monitoring period (2001–2004). This 3-year period represents the typical wave conditions of this region. Historical barrier evolution was characterised for the 1947–2001 period. Up until 1996, the supratidal barrier changed from barred sand to fully developed dunes. In 2001, a wide washover plain had developed and an updrift tidal inlet (Ancao Inlet) was migrating toward the study area. Between 2001 and 2004, the study area had three geomorphological sectors. Sector A (westernmost) showed the widest beach berms that developed because of welding of swash bars of Ancao...
Databáze:	OpenAIRE
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