Lesław Zabuski
Polish Academy of Sciences
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Featured researches published by Lesław Zabuski.
Environmental Earth Sciences | 2015
Lesław Zabuski; Waldemar Świdziński; Marek Kulczykowski; Teresa Mrozek; Izabela Laskowicz
The paper discusses landslides investigated in a Brda river valley in the region of the town Koronowo near Bydgoszcz (Kujawsko-Pomorskie Voivodeship) in the Polish Lowlands. Due to morphologic and geologic setting the area is prone to slope instability. Out of 32 identified landslides, 9 were selected for detailed examination. To register a nature and rate of failures a complex monitoring system was installed on slopes where the selected landslides resulted in damages to municipal infrastructure. The system was facilitated with inclinometers and piezometers, supported by a network of GPS-RTK geodetic benchmarks as well as with a recording station. The performed examination revealed that the most unfavourable arrangement of the layers is, when under a non-cohesive soil lies a cohesive impermeable layer. The landslides are rather shallow ones (except for two incidents) with slow rate of displacement. The landslide-triggering factor is water originating from precipitation and snow melting. Influence of water was especially significant in early spring 2011, due to the combined effect of snow melting and infiltration of thawing water originating from the former, as well as exceptionally high rainfalls. The influence of hydrologic conditions on slope deformations is complex. There is a significant time lag between a movement initiation and unfavourable hydrometeorological conditions. That is exemplified with the landslide that was initiated in February–March 2011 in consequence of atmospheric conditions of November–December 2010. The results formed the background for inventing engineering treatment measures aiming at current remedial stabilisation of slopes and mitigation of possible landsliding in the future.
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards | 2008
L. Borgatti; Alessandro Corsini; Gianluca Marcato; Francesco Ronchetti; Lesław Zabuski
The Ca’ Lita landslide is a large and deep-seated mass movement located in the northern Apennines, about 70 km west of Bologna (Northern Italy). It consists of a composite landslide that affects Cretaceous to Eocene flysch rock masses and chaotic complexes. Many of the sectors making up the landslide have resumed activity between 2002 and 2006, threatening some villages and an important road connecting several key industrial facilities located in the upper watershed. This paper presents the management of the emergency, dealing with the investigation campaigns (geological, geomorphological and LiDAR surveys, borehole drillings, seismic surveys), with the monitoring (in situ instrumentation) and with the design and construction of mitigation measures. The whole process, from landslide reactivation to date, has been modelled on a numerical basis with the finite difference code FLAC 2D, to assess the efficiency of the mitigation system and to propose further countermeasure works in different scenarios.
Rock Testing and Site Characterization#R##N#Principles, Practice and Projects | 1993
Kazimierz Thiel; Lesław Zabuski
Publisher Summary Hydroengineering projects are often situated in mountain regions, in the rock masses fonning the mountains. Most hydroelectric power stations are built there, consisting of dams, hydroelectric power station chambers and different types of ‘conduits’ supplying water to the station, such as pressure tunnels, shafts, etc. The main criteria for locating such projects are the suitable morphology of the terrain surface, and the type and structure of the rock mass fonning the geological environment for the structure. Therefore, the features of the rock mass should be precisely defined. Its geological and mechanical characteristics should be recognized in detail in the natural state, and then its possible behavior as it changes by the loading generated by the structure should be estimated.
Geotechnical and Geological Engineering | 2016
Giulia Bossi; Lesław Zabuski; Alessandro Pasuto; Gianluca Marcato
In order to assess the stability of a landslide, continuous or discontinuous models have been proposed. Here, we compare the two methods in their capability to provide a reliable hazard assessment. Both models have been applied to long term monitoring data obtained from a landslide located in Passo della Morte (Eastern Italian Alps). The availability of accurate data obtained in a long-term campaign is a pre-requisite to correctly understand the dynamics of the process and to implement a sound numerical model. First, a detailed geological investigation located the different soil layers and rock formations with their distribution along the slope, allowing the identification of the structural controls of the unstable rock mass. Then, landslide long term monitoring data provided information on the type of failure mechanism. Both the continuous and discontinuous numerical solutions describe the kinematics for the landslide and allow to delineate a hazard assessment for the investigated area. The continuous model is better in delineating the development of the deep slip surface while the discontinuous allows to recreate the toppling phenomenon.
Archives of Hydro-engineering and Environmental Mechanics | 2017
Lesław Zabuski; Giulia Bossi; Gianluca Marcato
Abstract The paper presents the principles of the slope reprofiling and proves the effectiveness of this stabilization measure. The case study of two adjacent landslides in the National Road 52 “Carnica” in the Tagliamento River valley, the Carnian Alps (46°23′49″N, 12°42′51″E) are the example allowing for illustration of this approach. The phenomena have been studied for more than a decade, making it possible to carry out a detailed geological and geomorphological reconstruction. That was done on the basis of a large amount of monitoring data collected during that period. Since the landslides are threatening an important road, countermeasure works to ameliorate the stability conditions of the slides need to be designed. The paper focuses on the creation of a numerical model consistent with monitoring data and capable of reconstructing the dynamics of both landslides. Two cross-sections, one for each landslide, were selected for the analysis. The geometry of the slip surface was determined on the basis of control points, such as slip surface readings from inclinometers, and geomorphological evidence for the contour. The FLAC2D code was used to evaluate the current stability of these landslides and to determine the effectiveness of changing the slope geometry by removing material from the upper part of the slope and putting it to the lowest part as reinforcement.
Archives of Hydro-engineering and Environmental Mechanics | 2017
Piotr Szmytkiewicz; Lesław Zabuski
Abstract An analysis was carried out to determine the influence of landslide process at a few meters depth under the dune surface on the rebuilding of the dune. In the first step, calculations were done using the XBEACH model to determine seabed rebuilding as well as shore and dune undercutting for the assumed hydrologic and hydrodynamic conditions. Next, the obtained tachymetric profile of the dune and beach was fed into the FLAC2D program, and calculations of stress distribution, displacements and stability conditions were made. In this way, landslide movement was identified. The theoretical investigations clearly prove that waves attacking the dune not only cause surface erosion, but also trigger a landslide within the dune mass to a maximum depth of about 5 m. It results in a lowering of the dune crown by about 0:6 ÷ 0:7 m. Numerical models such as XBEACH, SBEACH or CSHORE do not take into account landslide occurrence, and thus underestimate dune erosion.
Archive | 2015
Marek Kulczykowski; Lesław Zabuski; Teresa Mrozek; Izabela Laskowicz; Waldemar Świdziński
The paper presents the analysis of the catastrophic landsliding that affected the embankment at the western bank of the Brda river and the bridge abutment of the abandoned narrow-gauge railway from Bydgoszcz to Koronowo (central Poland). The bridge (18 m max. height, 120 m long) was set in use in 1895. It is the highest truss bridge in Europe and it is assigned a technical monument status according to Polish legislation. The railway trail was closed in 1992, so after the bridge served as a pathway. The catastrophic landsliding occurred as effect of unfavourable lithology (loose soils underlain by clay), river valley-side geometry and cumulative triggering action of rain and melt-water. The initial slide exceeding a 10 m displacement developed almost perpendicularly to the embankment axis. Following slips, developed under the bridge, resulted in removal of buttressing and the abutment exposure. The sliding process was simulated using Universal Distinct Element Code and applying a back analysis procedure. Based on the above, a remedial treatment was worked out which comprises stabilizing by retaining, slope profiling around the abutment as well as artificial drainage of the landslide area.
Engineering Geology | 2012
Gianluca Marcato; Matteo Mantovani; Alessandro Pasuto; Lesław Zabuski; Lisa Borgatti
Geological Quarterly | 2010
Lesław Zabuski; Antoni Wójcik; Eugeniusz Gil; Teresa Mrozek; Wojciech Rączkowski
Natural Hazards and Earth System Sciences | 2007
Gianluca Marcato; K. Fujisawa; Matteo Mantovani; Alessandro Pasuto; Sandro Silvano; F. Tagliavini; Lesław Zabuski