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Iskalni niz: "ključne besede" (marine geology) .

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1.
Not another hillshade: alternatives which improve visualizations of bathymetric data
Ana Novak, Sašo Poglajen, Marko Vrabec, 2023, izvirni znanstveni članek

Povzetek: Increasing awareness of the importance of effective communication of scientific results and concepts, and the need for more accurate mapping and increased feature visibility led to the development of novel approaches to visualization of high-resolution elevation data. While new approaches have routinely been adopted for land elevation data, this does not seem to be the case for the offshore and submerged terrestrial realms. We test the suitability of algorithms provided by the freely-available and user-friendly Relief Visualization Toolbox (RVT) software package for visualizing bathymetric data. We examine the algorithms optimal for visualizing the general bathymetry of a study area, as well as for highlighting specific morphological shapes that are common on the sea-, lake- and riverbed. We show that these algorithms surpass the more conventional analytical hillshading in providing visualizations of bathymetric data richer in details, and foremost, providing a better overview of the morphological features of the studied areas. We demonstrate that the algorithms are efficient regardless of the source data type, depth range, resolution, geographic, and geological setting. The summary of our results and observations can serve as a reference for future users of RVT for displaying bathymetric data.
Ključne besede: bathymetry, RVT, visualization, hillshade, geomorphology, marine geology, multibeam
Objavljeno v DiRROS: 01.12.2023; Ogledov: 206; Prenosov: 67
.pdf Celotno besedilo (15,49 MB)

2.
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
Livio Ronchi, Alessandro Fontana, Ana Novak, Annamaria Correggiari, Sašo Poglajen, 2023, izvirni znanstveni članek

Povzetek: 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.
Ključne besede: marine geology, CHIRP, stratigraphy, bathymetry, last glacial maximum, adriatic sea
Objavljeno v DiRROS: 31.05.2023; Ogledov: 280; Prenosov: 101
.pdf Celotno besedilo (8,68 MB)
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