20.500.12556/RUL-128684 Sound velocity in a thin shallowly submerged terrestrial-marine Quaternary succession (northern Adriatic sea) Estimating sound velocity in seabed sediment of shallow near-shore areas submerged after the Last Glacial Maximum is often difficult due to the heterogeneous sedimentary composition resulting from sea-level changes affecting the sedimentary environments. The complex sedimentary architecture and heterogeneity greatly impact lateral and horizontal velocity variations. Existing sound velocity studies are mainly focused on the surficial parts of the seabed sediments, whereas the deeper and often more heterogeneous sections are usually neglected. We present an example of a submerged alluvial plain in the northern Adriatic where we were able to investigate the entire Quaternary sedimentary succession from the seafloor down to the sediment base on the bedrock. We used an extensive dataset of vintage borehole litho-sedimentological descriptions covering the entire thickness of the Quaternary sedimentary succession. We correlated the dataset with sub-bottom sonar profiles in order to determine the average sound velocities through various sediment types. The sound velocities of clay-dominated successions average around 1530 m/s, while the values of silt-dominated successions extend between 1550 and 1590 m/s. The maximum sound velocity of approximately 1730 m/s was determined at a location containing sandy sediment, while the minimum sound velocity of approximately 1250 m/s was calculated for gas-charged sediments. We show that, in shallow areas with thin Quaternary successions, the main factor influencing average sound velocity is the predominant sediment type (i.e. grain size), whereas the overburden influence is negligible. Where present in the sedimentary column, gas substantially reduces sound velocity. Our work provides a reference for sound velocities in submerged, thin (less than 20 m thick), terrestrial-marine Quaternary successions located in shallow (a few tens of meters deep) near-shore settings, which represent a large part of the present-day coastal environments. sound velocity Quaternary sediment submerged alluvial plain true false true Angleški jezik Ni določen Članek v reviji 2021-07-23 08:12:14 2021-07-23 08:12:14 2023-03-17 16:57:30 0000-00-00 00:00:00 2020 0 0 18 str. iss. 2, art. 560 Vol. 12 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 55 2073-4441 10.3390/w12020560 1551454 RAZ_Novak_Ana_2020.pdf RAZ_Novak_Ana_2020.pdf 1 486FF4C0671F418618A694427C2DA0DE 4570146209752411867a2f3a3a89c7009dcf87a58235a7ddc1e889445e11588e 019fdb81-eb7d-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145502 https://www.mdpi.com/2073-4441/12/2/560 0 fb687c13-eb7c-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145501 Naravoslovnotehniška fakulteta 0 0 0