Marine Erosion and Slope Movements: SE Coast of the Krk Island

Benac, Čedomir; Jovančević, Sanja Dugonjić; Ružić, Igor; Vivoda, Martina; Peranić, Josip

doi:10.1007/978-3-319-04996-0_86

Cited by 3 publications

(5 citation statements)

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“…Geomorphological characteristics express the relative erodibility of different landform types and require information on the spatial distribution and their stability. Geomorphological features were defined from the orthophoto maps (2003-2014) combined with the digital elevation model data (DEM, 5 × 5 m), available geological maps, a recent field investigation, and data from the professional and scientific papers [20,21,25,33]. Different vulnerability levels were defined inside the five geological zones of the research area: proluvial sediments, resistant carbonate rocks, crushed carbonate rocks, talus breccia, flysch rock, and colluvium.…”

Section: Methodsmentioning

confidence: 99%

“…Despite bare karst in surrounding altitudes, a large part of this rock mass is covered by Quaternary sediments: the western part of the investigated area is covered by talus breccias and the eastern part by breccia and colluvial deposits (a mixture of silty clay and carbonate rock fragments) ( Figure 2). Outcrops of siliciclastic rock mass are visible sporadically in the narrow coastal zone [20,21,33].…”

Section: Study Areamentioning

confidence: 99%

“…Problems of coastal vulnerability induced by marine erosion in the Kvarner area have been described in several previous studies, and are therefore better understood and documented than in other coastal parts of Croatia. The results of the recent research have shown vulnerability in the southeastern coast of Krk Island, near Stara Baška (Figure 1) [18][19][20][21][22][23][24]. Marine erosion and problems of coastal vulnerability in the wider area of Stara Baška have been described in several recent studies [20,21,25].…”

Section: Introductionmentioning

confidence: 99%

“…The results of the recent research have shown vulnerability in the southeastern coast of Krk Island, near Stara Baška (Figure 1) [18][19][20][21][22][23][24]. Marine erosion and problems of coastal vulnerability in the wider area of Stara Baška have been described in several recent studies [20,21,25]. However, a Coastal Vulnerability Index (CVI) has never been calculated for the Croatian coast.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Coastal Vulnerability Index in an Area of Complex Geological Conditions on the Krk Island, Northeast Adriatic Sea

et al. 2019

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This study presents a vulnerability assessment methodology that was developed to analyze the Croatian Eastern Adriatic Coast (CEAC), which has extremely complex geomorphology. Local coastal retreat, slope instability phenomena, and the influence of marine erosion play a significant role in coastal geohazards in the southeastern coastal area of the Krk Island (Kvarner area, northeastern channel part of the Adriatic Sea). Recent studies emphasize the need to develop an adequate methodology to monitor its evolution and define adequate risk management strategies. The vulnerability analysis was performed on the basis of the available data, taking into account local geological and oceanographic conditions. The coastal vulnerability analysis of the CEAC presents an adaptation of the existing methodology, emphasizing the significance of the geological factor, and providing novel elements of the parameter analysis (i.e., coastal slope, beach width, and significant wave height). This methodology was adapted and improved for the local rocky coast, but can be used on other complex rocky coasts worldwide. The calculated Coastal Vulnerability Index (CVI) around the Stara Baška settlement should be considered to have priority over the vulnerable areas in further monitoring and investigations.

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Section: Methodsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of the Coastal Vulnerability Index in an Area of Complex Geological Conditions on the Krk Island, Northeast Adriatic Sea

et al. 2019

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“…Besides, few studies have been conducted on artificial gravel beaches (e.g., [4,41,42]) despite increased research on gravel beaches (e.g., [43]). So far SfM photogrammetry and UAVs have been used in EAC to monitor natural gravel pocket beaches (GPBs) [3,36,44,45], coastal cliffs stability and coastal vulnerability [46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Post-Nourishment Changes of an Artificial Gravel Pocket Beach Using UAV Imagery

Tadić

Ružić

Krvavica

et al. 2022

JMSE

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Monitoring and analysis of changes in the volume and area of nourished beaches is crucial to inform any beach renourishment programme. The aim of this study is to utilise UAV surveys and SfM photogrammetry to assess the beach nourishment performance of an artificial gravel beach exposed to a range of external forcing, including storms. The paper presents results from nineteen UAV surveys conducted between January 2020 and January 2021 at Ploče, an artificial beach in Rijeka (Croatia). The beach was nourished twice and eleven storm events, ranging from weak to strong, were recorded during this period. The Agisoft Metashape software was used to obtain point clouds and digital elevation models (DEM) from UAV images; Matlab and CloudCompare were used for further analysis of the DEMs. The accuracy and precision of the DEMs was assessed and uncertainty levels of ±5 cm were applied to all derived DEMs. The study provides new insights into the response of the emerged part of the beach to storms. Predictably, the largest changes were recorded after the first storm following beach nourishment. The longshore variability in the beach response to storms was identified from full 3D point clouds. Most of the lost sediment was from the east side of the beach, while the rest of the beach aligned with the predominant wave direction through cross-shore and longshore processes. Offshore/onshore sediment exchange between the lower and upper beach face on the western side manifested itself in beach profile steepening and berm formations. Overall, changes in beach volume and area were small, indicating that this artificial beach is relatively stable. The embayed layout following the natural coastal configuration appears to be effective in retaining nourished sediment on the beach. This work highlights the need to consider pocket embayed beaches in three dimensions, as traditional transect studies can overlook the three-dimensional behaviour. This study also highlighted the wider potential of UAVs and SfM for studies of high-resolution elevation changes on natural and artificial beaches, as well as for coastal monitoring of beach nourishment.

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The Application of UAV for the Analysis of Geological Hazard in Krk Island, Croatia, Mediterranean Sea

et al. 2021

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The coastal area around the settlement of Stara Baška (Krk Island, NE channel zone of Adriatic Sea) is in a delicate geodynamic balance. The main causes are the geological structure, hydrological and hydrogeological conditions and the direct exposure of the coast to the waves and storm surges. In this paper, the effects of the expected sea level rise on the geological vulnerability of the coast are investigated. Detailed field research was conducted. The complex coastal morphology was surveyed using an Uncrewed Aerial Vehicle (UAV), and the UAV-derived data was used as a 3D point cloud and orthophoto for analysis. In the investigated coastal zone, more resistant Quaternary talus breccias predominate over more susceptible flysch rock mass. One major and two smaller landslides are in a creeping condition and pose a hazard to the surrounding homes. During storm surges, the pocket beaches are completely inundated due to the narrow beach width and waves reach the toe of the slopes. According to the expected sea level rise, coastal processes could become more intense and threaten the current coastal equilibrium. The vulnerability of a large part of the Stara Baška settlement will increase significantly. The conducted research showed the advantages of UAV-derived data for the study of complex rocky coasts and emphasized the need for repeatable UAV surveys.

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Marine Erosion and Slope Movements: SE Coast of the Krk Island

Cited by 3 publications

References 3 publications

Assessment of the Coastal Vulnerability Index in an Area of Complex Geological Conditions on the Krk Island, Northeast Adriatic Sea

Assessment of the Coastal Vulnerability Index in an Area of Complex Geological Conditions on the Krk Island, Northeast Adriatic Sea

Post-Nourishment Changes of an Artificial Gravel Pocket Beach Using UAV Imagery

The Application of UAV for the Analysis of Geological Hazard in Krk Island, Croatia, Mediterranean Sea

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