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Title:Late-Quaternary evolution of the semi-confined alluvial megafan of Isonzo River (Northern Adriatic): where the fluvial system of the Southern Alps meets the karst
Authors:ID Ronchi, Livio (Author)
ID Fontana, Alessandro (Author)
ID Novak, Ana (Author)
ID Correggiari, Annamaria (Author)
ID Poglajen, Sašo (Author)
Files:.pdf PDF - Presentation file, download (8,68 MB)
MD5: 0CE02A4E53B10D487D2E7DA8BF238907
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo GeoZS - Geological Survey of Slovenia
Abstract:The evolution of alluvial megafans has mainly been investigated in unconfined settings; however, at the boundary of these large depositional systems, the development of fluvial channels can be affected by structural constraints with regional extent. Here we present the study of the eastern sector of the megafan of Isonzo River, in the Gulf of Trieste, where this system fed through the southern Alps is constrained by the Karst and Istria cliffs. Although this area is now submerged under the northern Adriatic Sea, stratigraphy from seismo-acoustic profiles, drill cores and multi-beam bathymetry allows us to reconstruct the paleochannel system of the Isonzo River in detail, which was likely active within the period of 21–17.5 ka cal BP, at the end of LGM. This was reconstructed for over 50 km and currently represents the longest abandoned fluvial channel in the Mediterranean seabed. The occurrence of the mountain fringe and competition with nearby alluvial systems forced the paleochannel to follow the present coastline and conditioned the slope of its thalweg to decrease almost to null, resulting the transformation from the megafan to the undifferentiated alluvial plain.
Keywords:marine geology, CHIRP, stratigraphy, bathymetry, last glacial maximum, adriatic sea
Publication status:Published
Publication version:Version of Record
Publication date:07.05.2023
Publisher:MDPI
Year of publishing:2023
Number of pages:13 str.
Numbering:vol. 13, no. 5
PID:20.500.12556/DiRROS-16486 New window
UDC:551.7
ISSN on article:2076-3263
DOI:10.3390/geosciences13050135 New window
COBISS.SI-ID:151155715 New window
Note:
Publication date in DiRROS:31.05.2023
Views:954
Downloads:280
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RONCHI, Livio, FONTANA, Alessandro, NOVAK, Ana, CORREGGIARI, Annamaria and POGLAJEN, Sašo, 2023, Late-Quaternary evolution of the semi-confined alluvial megafan of Isonzo River (Northern Adriatic): where the fluvial system of the Southern Alps meets the karst. Geosciences [online]. 2023. Vol. 13, no. 5. [Accessed 10 April 2025]. DOI 10.3390/geosciences13050135. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=16486
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Record is a part of a journal

Title:Geosciences
Shortened title:Geosciences
Publisher:MDPI AG
ISSN:2076-3263
COBISS.SI-ID:519967769 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:J1-1712-2019
Name:Zapis okoljskih sprememb in človekovega vpliva v holocenskih sedimentih Tržaškega zaliva
Funder:ARRS - Slovenian Research Agency
Project number:P1-0011-2019
Name:Regionalna geologija
Funder:Other - Other funder or multiple funders
Name:SEA- LEvel rApid PulseS during the Holocene marine transgression
Acronym:SEA LEAPS
Funder:Other - Other funder or multiple funders
Name:The Italian Research for the Sea
Acronym:RITMARE

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

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