Debris flooding magnitude estimation based on relation between dendrogeomorphological and meteorological records

Novak, Andrej; Popit, Tomislav; Levanič, Tom; Šmuc, Andrej; Kaczka, Ryszard J.

doi:10.1016/j.geomorph.2020.107303

Cited by 8 publications

(4 citation statements)

References 30 publications

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“…Considering the possible tangential extension and radial shift of TRDs with increasing distance from wounds, uncertainties in the intra-seasonal timing of past flash floods can only be assured if reconstructions are realized with cross sections (Schneuwly et al 2009a(Schneuwly et al , 2009b. No compression wood was found after the impact of flash flood, which also occurred in the reconstruction of debris flows Novak et al 2020). The result is consistent with what we saw in the field that sampled trees showed no obvious signs of leaning.…”

Section: Discussionmentioning

confidence: 99%

Long-term reconstruction of flash floods in the Qilian Mountains, China, based on dendrogeomorphic methods

et al. 2022

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situations that may have led to the triggering of flash floods in the past. Logistic regression analysis confirms that significant correlation exists between cumulative maximum 5-day August-September precipitation and reconstructed flash floods, which is corresponding to the majority of scars and related tangential rows of traumatic resin ducts (TRDs) found in the latewood portion of growth rings. These results support the idea that abundant precipitation occurring at the end of the summer season and early fall is the key factor driving flash floods in our study area. Our research not only fills the gaps regarding historical flash flood histories in the Qilian Mountains, but also provides a scientific basis for the region's response to climate change and flood prevention and reduction.

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Section: Discussionmentioning

confidence: 99%

Long-term reconstruction of flash floods in the Qilian Mountains, China, based on dendrogeomorphic methods

et al. 2022

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“…The long-term activity of the Urbas landslide over the past 138 years has also been reconstructed using the dendrogeomorphological analysis of bent trees (Oven et al, 2019). Dendrogeomorphology has proven to be a highly useful method in the study of past slope mass movements and has recently been applied to the analysis of the debris flood magnitude in the Planica valley (Novak et al, 2020). The estimated risk and visible activi-ty of landslides have increasingly attracted the attention of the inhabitants of Koroška Bela and the Civil protection service.…”

Section: An Overview Of Past Researchmentioning

confidence: 99%

Review of the research and evolution of landslides in the hinterland of Koroška Bela settlement (NW Slovenia)

PETERNEL¹,

ŠEGINA²,

JEŽ³

et al. 2022

Geologija

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This paper gives an overview of landslide research and the activity of landslides located above the Koroška Bela settlement in Northwest Slovenia. There are several landslides in this area and they pose a direct threat to the settlement below. The settlement is very densely populated (about 2,100 inhabitants) and has well-developed industry and infrastructure. It is built on deposits from past debris flows, indicating that large slope mass movements have occurred in the past. In this regard, the hinterland of Koroška Bela has been investigated since 2006, within the framework of various research, technical and European projects. The most extensive geological and geotechnical investigations were carried out after April 2017, when part of the Čikla landslide collapsed and mobilised into a debris flow. All of the investigations which have been carried out over the years revealed that the hinterland of Koroška Bela is characterised by high landslide activity due to geological, hydrogeological and tectonic conditions. In order to protect people and their property, it is essential to implement a holistic mitigation measure which includes remediation works (drainage works, debris flow breaker, etc.) and non-structural measures (monitoring system, early warning system, risk management, etc.). Regular and continuous monitoring of all landslides is also crucial to observe the landslide dynamics and evaluate the effectiveness of structural mitigation measures.

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“…The valley slopes are predominantly composed of Upper Triassic carbonates (Gale et al, 2015) and the valley floor is covered by various Quaternary sedimentary bodies, of which the Holocene alluvial fans are the most numerous (Novak et al, 2018). The alluvial fans have ephemeral streams in which the sediment (mainly gravel) is very actively deposited by water flows and sporadic debris floods (Novak et al, 2018(Novak et al, , 2020. The studied Suhi vrh alluvial fan is located on the eastern slope of the valley below Suhi vrh Mountain (Figures 1 and 2a).…”

Section: Study Sitementioning

confidence: 99%

“…Surface changes were linked to recorded precipitation events from the Rateče Meteorological Station (ARSO, 2021d) by selecting the most intense rainfall events that could potentially trigger sediment transport. Following the studies of Guzzetti et al (2007), ARSO (2009ARSO ( , 2021b, and Novak et al (2020), the threshold for a potentially triggering precipitation event was set at 50 mm of rainfall in 24 h. Intense 48 h rainfall events were also considered as potential triggers. Additional meteorological factors such as snowfall and snow cover were also considered as factors that could reduce or increase sediment transport.…”

Section: Small Unmanned Aircraft Surveys Surface Change Detection And...mentioning

confidence: 99%

Facies analysis, depositional activity, and internal structure of sieve deposits on an active alluvial fan

Novak

Vrabec

Popit

et al. 2022

Earth Surf Processes Landf

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Sieve lobes typically appear in gravel‐rich and matrix‐poor alluvial fans. Despite being extensively studied, the sieve‐lobe facies has been defined largely based on qualitative field observations without quantitative sedimentological analyses. Additionally, depositional activity of sieve lobes has not been monitored over extended periods (monthly to annually) and not directly associated with specific precipitation triggers. Furthermore, the internal geometry of sieve‐lobe built alluvial fans has not yet been imaged by subsurface methods. We performed a multi‐method analysis of sieve lobes in the Julian Alps (NW Slovenia) on an alpine alluvial fan composed of carbonate gravels. We performed a detailed textural and structural sedimentological analysis of 11 recent sieve lobes differing in size and age. A three‐year aerial survey of the alluvial fan surface with a small unmanned aircraft and photogrammetric modelling was used to detect active sieve‐lobe evolution. Detected sieve‐lobe formation events and volumetric surface changes were paired with triggering precipitation events. Ground‐penetrating radar (GPR) profiling depicted the geometry of the sieve‐lobe built alluvial fan. The sieve‐lobe facies consists of over 80% poorly sorted, open‐framework gravels and less than 2% mud. Lobes exhibit downward coarsening and increase in clast mean size. These textural and structural characteristics are present in all sieve lobes regardless of their age and size. Sieve lobes form with a sub‐annual frequency, usually following 24 h rainfall events exceeding 50 mm. Over 1000 m3 of sediment was deposited during these events. The GPR profiles confirm that the studied alluvial fan is formed predominantly by stacked sieve lobes. Quantitative sedimentary analysis of sieve lobes, monitoring of their recent evolution, and depiction of their subsurface geometry—demonstrated in this study—reinforce the challenged concept that sieve lobes are one of the main building blocks of alluvial fans. This work also demonstrates that, under specific conditions, sieving may become the dominant alluvial fan‐forming process.

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Debris flooding magnitude estimation based on relation between dendrogeomorphological and meteorological records

Cited by 8 publications

References 30 publications

Long-term reconstruction of flash floods in the Qilian Mountains, China, based on dendrogeomorphic methods

Long-term reconstruction of flash floods in the Qilian Mountains, China, based on dendrogeomorphic methods

Review of the research and evolution of landslides in the hinterland of Koroška Bela settlement (NW Slovenia)

Facies analysis, depositional activity, and internal structure of sieve deposits on an active alluvial fan

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