Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 2024

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Triggers of present-day rockfalls in the zone of sporadic permafrost in non-glaciated mountain region: the case study of Turnia Kurczaba (the Tatra Mts., Poland)

Kajdas Joanna, Gądek Bogdan, Rączkowska Zofia, Cebulski Jarosław

Geology, Geophysics and Environment

2024

Vol. 50, no. 1

23--38

In recent decades there has been growing evidence of the impact of ongoing climate warming on the frequency of rockfalls. However, these are not adequately documented, especially in non-glaciated, high mountain regions of middle latitude. This study comprehensively documents the Turnia Kurczaba rockfall, one of the most significant rockfalls recorded in recent decades in the Tatra Mountains. The precise projections of the volumes and distribution of rock losses and deposits, the determination of the trajectories, modes and speeds of movement of rock material, as well as information on the geological, morphological, and meteorological conditions behind the Turnia Kurczaba rockfall form a unique dataset. The data documents a spectacular episode in the contemporary development of a complex slope system in the Tatras in an all-encompassing way and can be used to validate and calibrate existing models and improve numerical simulations of other rockfalls, both for hazard and risk assessment and slope evolution studies. Moreover, in the context of archival data, they demonstrate that in the Tatra sporadic permafrost zone, only relatively small rockfalls have been recorded in recent decades. Their cause was not the degradation of permafrost but freeze-thaw processes with the co-participation of rainwater and meltwater. The largest of these occur within densely fractured cataclysites, mylonites, and fault breccias. The impact of rockfalls on the morphodynamics of talus slopes is uneven in the storied arranged rock-talus slope systems. Even colluviums belonging to the same slope system can differ in their development rate and regime, and different thermal and wetness drivers can control their evolution.

Quantitative changes in near-channel landslides caused by fluvial erosion in the light of high-resolution DEM

Cebulski Jarosław

Studia Geomorphologica Carpatho-Balcanica

2022/2023

Vol. 56/57

3--50

The article deals the issue of near-channel landslide activity in two regions (Rożnowskie Foothills and Beskid Niski Mountains) in the Polish Outer Carpathians. The main objective of the research was to determine the volume of material removed from the studied landslides in the period from their occurrence to 2012 and to compare these results with the volume of material removed from landslides during the period of detailed research in 2014–2017. The ALS data was used to prepared to the DoDs analysis DoD analysis with theoretical landslide surfaces and to determine the volume of material removed from the occurrence of landslides to 2012. Detailed TLS surveys (10 measurement series) were carried out from April 2014 to November 2017, resulting in nine Digital Elevation Models (DEMs) of Difference (DoDs), illustrating quantitative and spatial changes within the investigated landslides. It was found that near-channel landslides, under the influence of ongoing fluvial erosion, exhibit continuous activity with varying intensity, depending on the hydrometeorological conditions. During flood events, the movements within the entire landslide area were activated. Conversely, in periods between floods, there was a constant removal of material from the toe of the landslides. During flood events, the material carried away by streams accounted for 60% to 90% of the volume of material removed throughout the research period. The volume of material removed from the landslide in 4 years of survey ranges from 14 to 107% of the material removed from the landslide since its occurrence to 2012.