Geologia Croatica, Vol. 72 No. 3, 2019.
Ostalo
https://doi.org/10.4154/gc.2019.14
On the origin of both a recent and submerged tombolo on Prvić Island in the Kvarner area (Adriatic Sea, Croatia)
Čedomir Benac
; University of Rijeka, Faculty of Civil Engineering, Department of Hydrotechnics and Geotechnics
Neven Bočić
orcid.org/0000-0001-6102-5330
; University of Zagreb, Faculty of Science, Department of Geography
Igor Ružić
; University of Rijeka, Faculty of Civil Engineering, Department of Hydrotechnics and Geotechnics
Sažetak
This paper analyzes the origins of two tombolos (one recent and another fossil/submerged) on the southwestern coast of Prvić Island, which is located in the Kvarner area in the northeastern part of the Adriatic Sea.
A recent tombolo on Cape Pipa was formed by the erosion of Quaternary deposits and Palaeogene siliciclastic rocks. The submerged tombolo is much bigger, clearly visible on the sea bed toward the southwest. The conditions for forming a submerged and recent tombolo have occurred during a slow rise and then stagnation of sea level of the Adriatic Sea in the Holocene. The sea flooded the fossil tombolo probably in the final part of a period of rapid sea-level rise at the beginning of the Holocene when a large proportion of the Quaternary sediments were eroded. Waves from the northwest (tramuntana) and southeast (jugo) refract and diffract around the tombolo. The nourishment of the beach body happens permanently on both sides of the cape. Accumulated sediments are protected by resistant rocky blocks of breccia on the peak of Cape Pipa, acting as a natural tombolo. Due to the fact that wave directions are perpendicular to the beach coastline, they do not generate longshore currents that would erode sediment in beach bodies around Cape Pipa. Therefore, the recent tombolo is probably stable in the present climatic and oceanographic conditions in the Kvarner area.
Ključne riječi
tombolo; marine erosion; coastal geomorphology; sea-level rise; Holocene
Hrčak ID:
228275
URI
Datum izdavanja:
31.10.2019.
Posjeta: 957 *