Abstract
Embayed beaches are laterally bounded by natural barriers such as rocky headlands or by artificial structures on human-altered coasts. They are commonly described as closed compartments because of limited sedimentary connection with other systems. However, this description is not accurate for many embayments, where sediment exchange can occur via headland bypassing. This study investigates natural sand bypassing between two embayed beaches along the Catalan coast, Pals and Sa Riera, and the influence of local stream-delivered sediment based on the analysis of repeated bathymetric surveys and surficial sediment samples. Sa Riera beach is a pocket beach separated from the Pals embayed beach by a rocky headland, and characterized by continuous progradation during the last decades. Comparison of bathymetric data spanning nearly two decades reveals sand bypassing between the beaches, supported by backscatter data and bottom sediment samples. Moreover, sediment samples highlight the significant contribution of local streams to sediment inputs at Sa Riera beach.
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