Characteristics of debris flows from the lower part of the Lotru River basin (South Carpathians, Romania)

Ilinca, Viorel

doi:10.1007/s10346-014-0489-6

Cited by 12 publications

(8 citation statements)

References 9 publications

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“…in this region in the last decade and possibility of more such events in the near future (Micu et 130 al. 2013;Ilinca 2014;Grecu et al 2017;Micu et al 2019). Apart from the temporally enhanced rainfall, surface runoff, soil moisture, the study area is also subjected to frequent earthquakes owing to its position in the Vrancea Seismic Zone that is one of the most active seismic zones in Europe (Fig.…”

Section: )mentioning

confidence: 99%

Evaluating landslide response in seismic and rainfall regime: A case study from the SE Carpathians, Romania

Kumar

Cauchie

Mreyen

et al. 2021

Preprint

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Abstract. There have been many studies exploring the rainfall induced slope failures in the earthquake affected terrain. However, studies evaluating the potential effects of both landslide triggering factors; rainfall and earthquake have been infrequent despite the rising global landslide mortality risk. The SE Carpathians, which have been subjected to many large historical earthquakes and changing climate and thus resulting in frequent landslides, is one such region that is least explored in this context. Therefore, a massive (~9.1 Mm2) landslide, situated along the Basca Rozilei River, in the Vrancea Seismic Zone, SE Carpathians is chosen as a case study area to achieve the aforesaid objective. The present state of slope reveals the Factor of Safety in a range of 1.17–1.32 with a static condition displacement of 0.4–4 m that reaches up to 8–60 m under dynamic (earthquake) condition. The Groundwater (GW) effect further decreases the Factor of Safety and increases the displacement. Ground motion amplification enhances the possibility of slope surface deformation and displacements. The debris flow prediction, implying the excessive rainfall effect, reveals a flow having 9.0–26.0 m height and 2.1–3.0 m/sec velocity along the river channel. The predicted extent of potential debris flow is found to follow the trails possibly created by previous debris flow and/or slide events.

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Section: )mentioning

confidence: 99%

Evaluating landslide response in seismic and rainfall regime: A case study from the SE Carpathians, Romania

Kumar

Cauchie

Mreyen

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…These factors, which appear only at discrete times, induce changes in the forces acting on rock blocks (Hoek, 2007) and cause the blocks to fall. The most common triggering factors are intense rainfall episodes (André, 1997;Berti et al, 2012;Ilinca, 2008;Rapp, 1960), the freeze and thaw of water-filled fractures (Ilinca, 2008;Matsuoka and Sakai, 1999), and repeated rock surface temperature variations (Frayssines and Hantz, 2006;Gunzburger et al, 2005;Luckman, 1976). Furthermore, seismic activity has been shown to influence rockfall events (Bull et al, 1994;Vidrih et al, 2001;Zellmer, 1987).…”

Section: Introductionmentioning

confidence: 99%

Statistical correlation between meteorological and rockfall databases

Delonca

Gunzburger

Verdel

2014

Nat. Hazards Earth Syst. Sci.

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Abstract. Rockfalls are a major and essentially unpredictable sources of danger, particularly along transportation routes (roads and railways). Thus, the assessment of their probability of occurrence is a major challenge for risk management. From a qualitative perspective, it is known that rockfalls occur mainly during periods of rain, snowmelt, or freeze-thaw. Nevertheless, from a quantitative perspective, these generally assumed correlations between rockfalls and their possible meteorological triggering events are often difficult to identify because (i) rockfalls are too rare for the use of classical statistical analysis techniques and (ii) not all intensities of triggering factors have the same probability. In this study, we propose a new approach for investigating the correlation of rockfalls with rain, freezing periods, and strong temperature variations. This approach is tested on three French rockfall databases, the first of which exhibits a high frequency of rockfalls (approximately 950 events over 11 years), whereas the other two databases are more typical (approximately 140 events over 11 years). These databases come from (1) national highway RN1 on Réunion, (2) a railway in Burgundy, and (3) a railway in Auvergne. Whereas a basic correlation analysis is only able to highlight an already obvious correlation in the case of the "rich" database, the newly suggested method appears to detect correlations even in the "poor" databases. Indeed, the use of this method confirms the positive correlation between rainfall and rockfalls in the Réunion database. This method highlights a correlation between cumulative rainfall and rockfalls in Burgundy, and it detects a correlation between the daily minimum temperature and rockfalls in the Auvergne database. This new approach is easy to use and also serves to determine the conditional probability of rockfall according to a given meteorological factor. The approach will help to optimize risk management in the studied areas based on their meteorological conditions.

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“…These 'above-average' values refer to the monthly scale. This temporal overlapping of these variables further justifies the occurrence of debris flows and flash floods in this region in the last decade and possibility of more such events in the near future (Micu et al 2013;Ilinca 2014;Grecu et al 2017;Micu et al 2019). Apart from the temporally enhanced rainfall, surface runoff, soil moisture, the study area is also subjected to frequent earthquakes owing to its position in the Vrancea Seismic Zone that is one of the most active seismic zones in Europe (Fig.…”

Section: Rainfall and Earthquake Regimementioning

confidence: 73%

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Kumar

2021

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Characteristics of debris flows from the lower part of the Lotru River basin (South Carpathians, Romania)

Cited by 12 publications

References 9 publications

Evaluating landslide response in seismic and rainfall regime: A case study from the SE Carpathians, Romania

Evaluating landslide response in seismic and rainfall regime: A case study from the SE Carpathians, Romania

Statistical correlation between meteorological and rockfall databases

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