Cliff Failure Processes and Longshore Dispersal of Sediments, Vrgada Island (Croatia): Input from SFM Photogrammetryand Sediment Characteristics Kristina Pikelj University of Zagreb, Croatia Nina Furcic DVOKUT Ecro, Croatia Frane Marković University of Zagreb, Croatia This is a section of Tenth InternationaSymposium Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques(DOI: 10.36253/979-12-215-0556-6) by Laura Bonora, Marcantonio Catelani, Matteo De Vincenzi, Giorgio Matteucci Firenze University Press Florence 2024 https://doi.org/10.36253/979-12-215-0556-6.69

Available for academic research purposes

Open Access

Copyright Author(s)

Content licence CC BY-NC-SA 4.0

Metadata licence CC0 1.0

This is original content, published for academic research purposes

 Digital edition XML powered by Booksflow

The coastal cliff on the Vrgada island is developed in Pleistocene aeolian-alluvial deposits which are subject to constant erosion. Digital Structure-from-Motion photogrammetry has been used to record and monitor the erosion of the cliff most of which occurs in the form of rockfalls. As a result, an L-shaped beach has formed. The eroded material is reworked and partially washed away by rain and waves. The prevailing waves are generated by the Scirocco wind (SE, and they transport the eroded material from the eastern to the north-western part of the beach. This transport direction is confirmed by heavy mineral analysis, including grain size, and by the carbonate content of the beach sediments. It is expected that the local input of terrigenous sediment may affect seagrass meadows and waterways. Continued erosion of the Vrgada cliff could jeopardize anthropogenic infrastructure and alter the island's coastline in the future.

 Adriatic coastal cliff beach erosion long-shore drift SFM photogrammetry

It is available online at https://doi.org/10.36253/979-12-215-0556-6.69

References Banak A., Pikelj K., Lužar-Oberiter B., Kordić B. (2021) - The sedimentary record of Pleistocene aeolian-alluvial deposits on Vrgada Island (eastern Adriatic coast, Croatia). Geol. Croat. 74/2, 127-137. 10.4154/gc.2021.14 Blott S.J., Pye K. (2001) - A grain size distribution and statistics package for the analysis of unconsolidated sediments. Earth Surf. Process. Landf. 26, 1237-1248. 10.1002/esp.261 Cremaschi M. (1990) - Stratigraphy and palaeoenvironmental significance of the loess deposits on Susak island (Dalmatian archipelago). Quat. Int. 5, 97-106. De Falco G., Batoli M., Cucco A., Simeone S. (2008) - Intrabasinal conditions promoting the development of a biogenic carbonate sedimentary facies associated with the seagrass Posidonia oceanica. Cont. Shelf Res. 28/6, 797-812. 10.1016/j.csr.2007.12.014 Folk R. L. (1954) - The distinction between grain size and mineral composition in sedimentary rock nomenclature. J. Geol. (1954) 62, 344 - 356. Folk R.L., Ward W.C. (1957) - A Study in the Significance of Grain-Size Parameters. J. Sediment. Petrol., 27, 3 - 26. Garzanti E., Andò S. (2019) - Heavy minerals for junior woodchucks. Minerals 9/18, 1-25. 10.3390/min9030148 Komar P.D., Wand C. (1984) - Processes of selective grain transport and the formation of placers on beaches. J. Geol. 92, 637-655. 10.1086/628903 Mamužić P., Nedela-Devide, D. (1968) - Basic Geological Map of SFRY: Biograd Sheet, scale 1:100.000, K33-7. Inst. geol.istraž., Zagreb (1963), Sav. Geol. zavod Beograd. Pavelić D., Kovačić M., Vlahović I., Wacha, L. (2011) - Pleistocene calcareous aeolian-alluvial deposition in a steep relief karstic coastal belt (island of Hvar, eastern Adriatic, Croatia). Sed. Geol. 239, 46-79. 10.1016/j.sedgeo.2011.05.005 Pikelj K., Juračić M. (2013) - Eastern Adriatic Coast (EAC): geomorphology and coastal vulnerability of a Karstic Coast. J. Coastal Res. 29 (4), 944 - 957. 10.2112/JCOASTRES-D-12-00136.1 Pikelj K., Vlastelica G., Kordić B. (2018) - Evaluation of erosional processes of the eroding flysch cliff in the Split urban zone (Croatia), Proceedings of the Seventh International Symposium: Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques At: Livorno, Italy, June 2018, pp. 607-616. Pikelj K., Furčić N. (2020) - Impact of cliff erosion on marine sediment composition - indication of local coastline evolution (Vrgada Island, Croatia), Proceedings of the Eighth International Symposium: Monitoring of Mediterranean Coastal Areas: Problems and Measurement Techniques At: Livorno, Italy, June 2020, pp. 462-468 10.36253/978-88-5518-147-1.46 Stanley J.D., Clemente P.L. (2014) - Mica and heavy minerals as marker to map Nile Delta coastline displacement during the Holocene. J. Coast. Res. 30/5, 904-921. 10.2112/JCOASTRES-D-14A-00003.1 Surić M., Juračić M., Horvatinčić N., Krajcar Bronić, I. (2005) - Late Pleistocene-Holocene sea-level rise and the pattern of coastal karst inundation: records from submerged speleothems along the eastern Adriatic coast. Mar. Geol 214 (1-3), 163 - 175. 10.1016/j.margeo.2004.10.030 Vlahović I., Tišljar J., Velić I., Matičec, D. (2005) - Evolution of the Adriatic carbonate platform: palaeogeography, main events and depositional dynamics. Palaeogeogr. Palaeoclimatol. Palaeoecol. 220, (3/4), 333 - 360. 10.1016/j.palaeo.2005.01.011 Vlastelica G., Pikelj K., Kordić, B. (2017) - Erosional processes acting on coastal cliffs in the Split urban zone, Croatia. Coastal and Maritime Mediterranean Conference Split, Croatia, Revue Paralia 4, 79-84.