Heterogeneously composed Lozice fossil landslide in Rebrnice area, Vipava Valley

Novak, Andrej; Verbovšek, Timotej; Popit, Tomislav

doi:10.5474/geologija.2017.011

Cited by 3 publications

(2 citation statements)

References 6 publications

(11 reference statements)

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“…The latter represent an array of composite, fan-shaped, sedimentary bodies with diverse composition, internal structures and textures, which indicate a complex depositional history and polyphase genesis (popit and Košir, 2010;popit, 2016, novaK et al, 2017.…”

Section: General Geological Settingmentioning

confidence: 99%

Origin of planation surfaces in the hinterland of Šumljak sedimentary bodies in Rebrnice (Upper Vipava Valley, SW Slovenia)

Popit¹

2017

Geologija

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The Rebrnice area forms the north eastern slopes of the Upper Vipava Valley and is located between Karst plateau to the southwest and the Nanos plateau to the northeast. The Rebrnice slopes are geomorphologically defined by a thrust front of Mesozoic carbonates over Tertiary flysch deposits and are characterised by a variety of polygenetic landslides (being the most prominent geomorphological features). Among them, the three Šumljak sedimentary bodies of fossil landslides (approximately 0.56 km² in area) comprise carbonate gravels and breccia. The most distinctive geomorphological element is the planation surface of the carbonate breccia blocks positioned in the hinterland of the Šumljak sedimentary bodies. Another feature is the presence of local escarpments (steep scarps) defining the border between the planation surface in the hinterland and sedimentary bodies.Our research suggests that the whole area in the hinterland of the Šumljak sedimentary bodies form part of a deep-seated rotational landslide formed of carbonate breccia. On the basis of the dipping of the breccia beds, in particular parts of the rotational blocks, the rotation can reach up to 60°. Planation surfaces developed above the curved, sliding plane in the central part and/or slightly outer part of the landslide. Steep scarps on the external parts of the planation surface represent the main scarps of the Šumljak sedimentary bodies. We propose that these bodies originated from the remobilization of material accumulated in outer parts of large-scale rotational slides and its transportation further downslope, mostly by rock avalanches. IzvlečekObmočje Rebrnic predstavlja severnovzhodna pobočja Zgornje Vipavske doline, ki se nahajajo med kraško planoto na jugozahodu in Nanosom na severovzhodu. Topografijo območja Rebrnic opredeljuje čelo narivnega robu mezozojskih karbonatov, ki so narinjeni na terciarne kamnine fliša, kontakt pa prekrivajo kvartarni pobočni sedimenti, med katerimi so najpomembnejši fosilni in recentni poligenetski plazovi. Med fosilnimi plazovi izstopajo tudi tri sedimentna telesa Šumljak (velikosti 0,56 km²), sestavljena iz karbonatnega grušča in breče in imajo specifične geomorfološke značilnosti. Najbolj značilen geomorfološki element so planarne (izravnane) površine blokov karbonatnih breč v zaledju sedimentnih teles Šumljak in prisotnost lokalnih morfoloških stopenj v obliki strmih robov, ki opredeljujejo mejo med izravnano površino v zaledju in sedimentnim telesom.Raziskave kažejo, da je celotno območje v zaledju sedimentnih teles Šumljak lahko del globokih rotacijskih plazov karbonatnih breč. Na podlagi plastnatosti breče na posameznih delih rotacijskih blokov, ugotavljamo, da so bloki rotirali do 60°. Izravnana površina je razvita predvsem v osrednjem delu planarnih površin, na zunanjih delih izravnav pa se pojavljajo strmi robovi, ki predstavljajo glavne odlomne robove sedimentnih teles Šumljak. Menimo, da so telesa, predvsem v zgornjem delu pobočja nastala kot posledica remobilizacije materiala z zunanjih delov v...

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Section: General Geological Settingmentioning

confidence: 99%

Origin of planation surfaces in the hinterland of Šumljak sedimentary bodies in Rebrnice (Upper Vipava Valley, SW Slovenia)

Popit¹

2017

Geologija

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“…The first group is lithified and unlithified scree deposits covering the upper part of the slope, while the second group is partially cemented complex Quaternary slope deposits covering the lower part of the slope. The latter represents a series of composite, fanshaped sedimentary bodies with different compositions, internal structures, and textures, indicating a complex depositional history and polyphase genesis [4,6,[15][16][17]. Quaternary slope deposits are moderately sorted and consist of gravel to medium boulder-sized clasts.…”

Section: Geological Settingmentioning

confidence: 99%

Using a Lidar-Based Height Variability Method for Recognizing and Analyzing Fault Displacement and Related Fossil Mass Movement in the Vipava Valley, SW Slovenia

et al. 2022

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The northern slopes of the Vipava Valley are defined by a thrust front of Mesozoic carbonates over Tertiary flysch deposits. These slopes are characterized by a variety of different surface forms, among which recent and fossil polygenetic landslides are the most prominent mass movements. We used the height variability method as a morphometric indicator, which proved to be the most useful among the various methods for quantifying and visualizing fossil landslides. Height variability is based on the difference in elevations derived from a high-resolution lidar-derived DEM. Based on geologic field mapping and geomorphometric analysis, we distinguished two main types of movements: structurally induced movement along the fault zone and movements caused by complex Quaternary gravitational slope processes. The most pronounced element is the sliding of the huge rotational carbonate massif, which was displaced partly along older fault structures in the hinterland of fossil rock avalanches and carbonate blocks. In addition to the material properties of the lithology, the level of surface roughness also depends on the depositional processes of the individual sedimentary bodies. These were formed by complex sedimentary events and are intertwined in the geological past. The sedimentary bodies indicate two large fossil rock avalanches, while the smaller gravity blocks indicate translational–rotational slides of carbonate and carbonate breccia.

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Improved Automatic Classification of Litho-Geomorphological Units by Using Raster Image Blending, Vipava Valley (SW Slovenia)

Jordanova

Verbovšek

2023

Remote Sensing

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Automatic landslide classification based on digital elevation models has become a powerful complementary tool to field mapping. Many studies focus on the automatic classification of landslides’ geomorphological features, such as their steep main scarps, but in many cases, the scarps and other morphological features are difficult for algorithms to detect. In this study, we performed an automatic classification of different litho-geomorphological units to differentiate slope mass movements in field maps by using Maximum Likelihood Classification. The classification was based on high-resolution lidar-derived DEM of the Vipava Valley, SW Slovenia. The results show an improvement over previous approaches as we used a blended image (VAT, which included four different raster layers with different weights) along with other common raster layers for morphometric analysis of the surface (e.g., slope, elevation, aspect, TRI, curvature, etc.). The newly created map showed better classification of the five classes we used in the study and recognizes alluvial deposits, carbonate cliffs (including landslide scarps), carbonate plateaus, flysch, and slope deposits better than previous studies. Multivariate statistics recognized the VAT layer as the most important layer with the highest eigenvalues, and when combined with Aspect and Elevation layers, it explained 90% of the total variance. The paper also discusses the correlations between the different layers and which layers are better suited for certain geomorphological surface analyses.

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Heterogeneously composed Lozice fossil landslide in Rebrnice area, Vipava Valley

Cited by 3 publications

References 6 publications

Origin of planation surfaces in the hinterland of Šumljak sedimentary bodies in Rebrnice (Upper Vipava Valley, SW Slovenia)

Origin of planation surfaces in the hinterland of Šumljak sedimentary bodies in Rebrnice (Upper Vipava Valley, SW Slovenia)

Using a Lidar-Based Height Variability Method for Recognizing and Analyzing Fault Displacement and Related Fossil Mass Movement in the Vipava Valley, SW Slovenia

Improved Automatic Classification of Litho-Geomorphological Units by Using Raster Image Blending, Vipava Valley (SW Slovenia)

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