Naslov
Beach love story: Posidonia Oceanica and Carbonaceous Sediment

Autori
Pikelj, Kristina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract book of the Symposium in Biology and Life Sciences (SiSB) 2023 / Vladimir, Klara ; Jurković, Hana ; Cahunek, Iva ; Hus, Petra ; Pribanić, Nika - Zagreb : Ispis d.o.o., 2023, 14-14

Skup
Symposium in Biology and Life Sciences (SiSB) 2023

Mjesto i datum
Zagreb, Hrvatska, 27.05.2023. - 28.05.2023

Vrsta sudjelovanja
Plenarno

Vrsta recenzije
Domaća recenzija

Ključne riječi
beach erosion, Posidonia banquettes, Dugi otok

Sažetak
Posidonia oceanica and carbonaceous sediment love story exists for many years. Why is ist so? The production, deposition and maintenance of bioclastic carbonate sediment on beaches is often related to the presence of seagrass meadows, especially along coasts such as Croatian. Moreover, carbonaceous sediment does not leave Posidonia oceanica even when its dead debris is continuously deposited on the beach in form of banquettes. Nowadays, due to increasing natural and anthropogenic pressures, beaches are at risk from erosion. Thus, the increased proportion of bioclastic carbonate material in beach sediment and banquettes requires a detailed analysis in terms of beach dynamics and related sediment supply. Two pocket beaches, Sakarun and Lojišće (Dugi otok Island) were monitored for a year to investigate the relationship between bioclastic beach sediment production, beach erosion, and maintenance with the presence of Posidonia oceanica meadows and its banquettes. The Sakarun beach is a semi-rural beach, seasonally exposed to extreme anthropogenic pressure. The emerged part of the beach consists mainly of gravel, while thin bioclastic carbonate sand veneer occurs in the lower supratidal and intertidal zones, becoming thicker in the submerged part of the beach. The sediment dynamics of the beach are directly related to prevailing SE wind waves. Posidonia banquettes here are natural biogeomorphological structures impregnated with sediment. Their removal also removes some part of the beach sediment and promotes more rapid erosion after storms. Lojišće beach is a natural remote beach, less affected by tourist activities. It consists entirely of bioclastic carbonate sand deposited by the same prevailing SE waves. It showed higher stability in the context of erosion and general sediment dynamics, while posidonia banquettes showed the same biogeomorphological role on the beach. The production of bioclastic carbonaceous sediment on both beaches is closely related to the Posidonia meadows in front of their bays, while the sediment supply of the beach depends on the prevailing waves. The same mechanism is responsible for the formation of banquettes. To keep this beach love story going, the management of banquettes should be considered in future coastal erosion control.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Interdisciplinarne prirodne znanosti

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