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Projects / Programmes source: ARIS

Erosional processes on coastal flysch cliffs and their risk assessment

Research activity

Code Science Field Subfield
1.06.00  Natural sciences and mathematics  Geology   

Code Science Field
1.05  Natural Sciences  Earth and related Environmental sciences 
Keywords
cliff, flysch, erosion, Slovenia
Evaluation (rules)
source: COBISS
Points
6,641.3
A''
816.64
A'
3,027.33
A1/2
3,863.16
CI10
4,367
CImax
242
h10
30
A1
22.17
A3
8.39
Data for the last 5 years (citations for the last 10 years) on February 25, 2024; A3 for period 2018-2022
Data for ARIS tenders ( 04.04.2019 – Programme tender, archive )
Database Linked records Citations Pure citations Average pure citations
WoS  349  5,025  4,161  11.92 
Scopus  411  6,070  4,906  11.94 
Researchers (16)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  35409  PhD Nejc Bezak  Hydrology  Researcher  2020 - 2024  315 
2.  51459  Jelka Helena Cronin  Civil engineering  Researcher  2021 - 2024 
3.  53536  Galena Debevec Jordanova  Geology  Junior researcher  2020 - 2024  24 
4.  21372  PhD Matej Dolenec  Geology  Researcher  2020 - 2024  473 
5.  11897  PhD Karmen Fifer Bizjak  Civil engineering  Researcher  2020 - 2024  290 
6.  31669  Andraž Geršak  Geology  Researcher  2021 - 2024  148 
7.  20407  Ema Hrovatin    Technical associate  2020 - 2024 
8.  23500  PhD Klemen Kozmus Trajkovski  Geodesy  Researcher  2020 - 2024  156 
9.  33435  PhD Klemen Kregar  Geodesy  Researcher  2020 - 2024  342 
10.  53600  Tamara Kuzmanić  Hydrology  Junior researcher  2020 - 2024  13 
11.  51116  Primož Miklavc    Technical associate  2020 - 2024  16 
12.  08245  PhD Matjaž Mikoš  Hydrology  Researcher  2020 - 2024  1,548 
13.  23426  PhD Boštjan Rožič  Geology  Researcher  2020 - 2024  369 
14.  24253  PhD Timotej Verbovšek  Geology  Head  2020 - 2024  372 
15.  15900  PhD Marko Vrabec  Geology  Researcher  2020 - 2024  322 
16.  29632  PhD Petra Žvab Rožič  Geology  Researcher  2020 - 2024  371 
Organisations (3)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0792  University of Ljubljana, Faculty of Civil and Geodetic Engineering  Ljubljana  1626981  26,327 
2.  1502  Slovenian National Building and Civil Engineering Institute  Ljubljana  5866324000  10,354 
3.  1555  University of Ljubljana, Faculty of Natural Sciences and Engeneering  Ljubljana  1627074  19,757 
Abstract
Coastal cliffs in flysch represent steep and unstable slopes, prone to erosion, as flysch is composed of alternation of softer marlstones and harder sandstones. Consequently, it is difficult to characterize due to its heterogeneity. There are several processes acting on the cliff – most importantly the erosion, being results of precipitation and intense rainfall, also the influence of the sea by abrasion, tidal action and wave energy, and other factors as the wind and rockfall. The scientific problem and goal of our project is the fact that systematical quantitative measurements of erosion and morphological changes of the cliff have not yet been performed. To understand the processes of cliff changes, all influencing factors should be quantified. With modern methods of geological mapping and geodetic methods (photogrammetric ranging, terrestrial laser scanning and satellite PSInSAR methods), we are able to determine the temporal and spatial changes of unstable regions very precisely. A special challenge will be the quantification of risk assessment, which will be one of our main research topics and novelties. We would like to upgrade the methodology of risk assessment, presented by Rio & Gracia (2009) for the coastal cliffs. They have defined two factors; the Hazard Index and Impact Index, which combine into the Risk Index. We chose this approach as all influencing factors are quantified, and we will improve their methodology by using additional parameters, such as ftacture orientation and spacing, plus the physically measured erosion rates. Another contribution will be also the study of sapping effects, as softer marlstone layers are eroded more quickly than harder sandstone beds, resulting in sapping (undermining) the more resistant layers above, leading to dangerous rockfalls. Relationships between the fracture spacing and bed thickness have been investigated, however sapping remains underinvestigated. Final novelty will be the integration of all methods, with also the practical aim of testing their applicability. Described processes have also a socio-economic impact. Very problematic is a large number of visitors all year-round and numerous bathers during the summer, which walk and lie directly at the base of cliffs. Another problem pose the residential buildings, built very close to the cliff edge, and some terraces have already been undermined. Current research are focused in the investigation of the recent collapse of the flysch slope in Strunjan, where we have performed photogrammetric measurements with UAV and calculated the volume of the collapse (2000 m3) by calculating the difference from two dates (2018 to 2020). Also, a 3D model of the collapse has been made (https://skfb.ly/6PQQD). Project program will be taken in the following working packages (WPs) and tasks (WTs) · WP 1. Project management and coordination throughout the complete project timeline · WP 2. Geological field work and analyses o WT 2.1 Geological mapping and profiling. o WT 2.2 Fracture orientation and spacing investigation. o WT 2.3 Mass movement and landslide mapping. o WT 2.4 Field sampling for mineralogical, geomechanical and slake durability tests. · WP 3. Geodetic field work and analyses o WT 3.1 Photogrammetric (PG) measurements with a remote Unmanned Aerial Vehicle (UAV). o WT 3.2 Terrestrial laser scanning (TLS). · WP 4. Laboratory analyses o WT 4.1 Geomechanical laboratory tests of rocks. o WT 4.2 Mineralogical analyses. o WT 4.3 Analysis of influence of hydrometeorological factors on the cliff activity. · WP 5. Analyses of results and modeling o WT 5.1 Analyses of geological field investigations and results from WP 2. o WT 5.2 Analyses of geodetic field investigations and results from WP 3. o WT 5.3 Precipitation and erosivity analysis. o WT 5.4 Satellite PsInSAR analyses. o WT 5.5 Rockfall modeling. · WP 6. Integration and synthesis of results. · WP 7. Dissemination of the project results.
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