Pavel Liscak - Academia.edu (original) (raw)

Papers by Pavel Liscak

World Geomorphological Landscapes

Acta Geologica Slovaca, Dec 15, 2009

Acta Geologica Slovaca, Dec 15, 2012

Journal of Sustainable Mining, 2014

Acta Geologica Slovaca, Jun 15, 2014

Exposure to hazards is expected to increase in Europe, due to rapid population growth in urban ar... more Exposure to hazards is expected to increase in Europe, due to rapid population growth in urban areas and the escalation of urbanization throughout many countries. In the framework of the European Geological Surveys (EGS), the Earth Observation and Geohazards Expert Group (EOEG) has carried out a survey based enquiry regarding the integration of geohazards (earthquakes, volcanoes, landslides, ground subsidence, floods and others) into urban and land-use planning. Responses from 19 European countries and 5 regions reveal heterogeneous policies across national borders. 17% of the countries have not yet implemented any legal measures to integrate geohazards into urban and land-use plans and half of the participating countries have no official methodological guides to construct geohazard maps. Additionally, there is a scarce knowledge about real social impacts of geohazards and resulting disasters in many of the countries, although they have a significant impact on their national economi...

The presented study shows using of bivariate and multivariate statistical analyses in mountain ar... more The presented study shows using of bivariate and multivariate statistical analyses in mountain area of the Krivánska Fatra Mountains affected by debris flows. Three generations of data were studied in order to assess the debris flows in the area, from these two main periods of debris flows were taken into the analysis: the debris flows from 1950s to 1970s and catastrophic debris flows from July 2014. Various input data were used in the statistical analyses: elevation, slope angle, plan curvature, topographic wetness index, flow accumulation, lithology, and land cover. Two main evaluations were made: first using the older debris flow data and second using debris flow data from the both periods. Receiver operating characteristic analysis was performed in order to assess the reliability of the models with the area under curve more than 95 % for both evaluations and more than 85 % for the first evaluation checked by both periods of debris flows in case of multivariate analysis, respecti...

SAR interferometry (InSAR) is inherently a relative geodetic technique requiring one temporal and... more SAR interferometry (InSAR) is inherently a relative geodetic technique requiring one temporal and one spatial reference to obtain the datum-free estimates on millimetre-level displacements within the network of radar scatterers. To correct the systematic errors, such as the varying atmospheric delay, and solve the phase ambiguities, it relies on the first-order estimation network of coherent point scatterers (PS).

Landscape and Urban Planning

Abstract An enquiry-based and participatory analysis approach is carried out to identify the stre... more Abstract An enquiry-based and participatory analysis approach is carried out to identify the strengths and weaknesses in the heterogeneous legislations across Europe that regulate the integration of landslide hazard into urban planning. Twenty one national and eight regional Geological Surveys (GSs) have participated in the analysis. The GSs report almost 4000 recent (2015–2017) damaging landslides events resulting in 39 fatalities and 155 injuries, destruction to housing, infrastructure and properties. In addition, 11 countries report 18 MORLE events over the past 10 years responsible for 150 fatalities and severe economic impacts. Results also reveal almost 48 million people living in areas with high and very high degrees of landslide-susceptibility (around 1 million km2 according to ELSUS v2). This work shows that almost half the participating countries (10 countries) have no legal guidance in the National Land Bill to stipulate consideration of landslides in urban planning practices, and mapping tools are often not adapted to a standard required to inform sustainable development. Furthermore, there is a wide range of laws and a large heterogeneity of mapping methods, scales and procedures. A relevant deficiency detected in many countries is the lack of landslide maps at a detailed resolution for urban planning. Additionally, some case studies of suboptimal urban development practices in areas of known instability have been discussed; they are found to be related to weak rule of law and/or absence of good governance. This paper shows inconsistencies across Europe in the handling of landslides and proposes a series of key actions to improve this situation, highlighting the need for a common regulatory framework to deal with this geohazard appropriately.

Geografický časopis - Geographical Journal

Mapping of debris flows by the morphometric analysis of DTM: a case study of the Vrátna dolina Va... more Mapping of debris flows by the morphometric analysis of DTM: a case study of the Vrátna dolina Valley, Slovakia The main objective of this contribution is to detect the morphogenetic processes by the numerical method of the differential geometry technique and compare the results with field surveying. The area of interest, the Vrátna dolina Valley, is located in the Malá Fatra Mountains in the northern part of Slovakia. Extensive mass movement deformations occurred in the surveyed area in 2014 induced by extreme precipitation events caused considerable damage. The Proxima software technology has been used to identify terrain elements using a precise digital terrain model (DTM) for the localisation of the debris flows head scarps. Precise DTM was derived from the airborne laser scanning (ALS) data. The morphometric analysis of landslide area was carried out on four selected locations. Verification of numerical mapping was performed by comparing results to the field survey data through visual comparison and area computation. Supplementary data was used in the form of orthophoto mosaics. The used spatial analysis applied on ALS data shows a high coincidence with the detection of the head scarps by field surveying, particularly in the hard to access and afforested areas. The main advantage of this approach lies in the reduction of field surveying and in the possible detection of the terrain changes not found during field surveying.

During the spring of 2013, a relatively large rockslide with a total area of 96,952 m2 occurred i... more During the spring of 2013, a relatively large rockslide with a total area of 96,952 m2 occurred in the eastern part of the Malá Fatra mountains. The anticipated depth of the slip surfaces was from 30 to 40 metres and the volume of moving mass was estimated to be 2,000,000 m3. The maximum movement of the rockslide on the first day in March 2013 was estimated to be 43 m. The front of the rockslide interfered with the projected D1 highway route. The paper presented here offers an analysis of the causes of the rockslide and its activity in association with the potential threat to the proposed highway.

Landslide Science for a Safer Geoenvironment, 2014

Landslides belong to the most significant geodynamic phenomena in the Slovak Republic. According ... more Landslides belong to the most significant geodynamic phenomena in the Slovak Republic. According to the recent data more than 21,190 slope failures (mostly landslides) have been registered in the Slovak part of the Western Carpathians. They cover an area of 2,576 km2 which represent 5.25 % of the total area of Slovakia. The landslides are concentrated especially in the Flysch and Neovolcanic regions. In May and June 2010 extraordinary rainfalls induced a lot of slope failures in some regions of Slovakia. More than 550 newly evolved landslides were registered especially in the Eastern Slovakia. The most disastrous landslide occurred in the Nižna Mysľa Village in the 4th June 2010. Amidst the village the local infrastructure (roads, gas and water pipelines, wells) and 40 houses were damaged. Twenty nine of them had to be demolished and several others became uninhabitable. Fortunately nobody was injured or died. After the Handlova landslide (1960–1961) it was the 2nd biggest one in Slovakia as concerns damages. The geological conditions of the area are prone for landsliding. The slopes at the western part of village are built by the Neogene high plastic clays with tuff and sand intercalations. The clays are sensitive to swelling and shrinking. The extreme rainfalls (250 mm/month) can be considered as the main triggering factor of sliding. After the landslide event the emergency state had been declared and the engineering geological survey started in June 2010. During the first stage of remedial works the middle part of village was stabilized. Currently, the whole landslide area is permanently monitored geodetically and by set of piezometric and inclinometric boreholes. The second stage of stabilization is in preparation. All the geological works at the landslide are coordinated by the Ministry of the Environment of the Slovak Republic and financed by the Slovak Government.

3D terrestrial laser scanning is a relatively new, but already revolutionary, surveying technique... more 3D terrestrial laser scanning is a relatively new, but already revolutionary, surveying technique. The survey yield a digital data set, which is essentially a dense “point cloud”, where each point is represented by a coordinate in 3D space. The most important advantage of the method is that a very high point density can be achieved, in the order of 5 to 10 mm resolution. In order to analyse the character and shape of the scanned surfaces it is necessary to convert the irregularly distributed point data into 3D surface information using surface reconstruction. The reconstructed surface can subsequently be visualized using a variety of 3D visualization techniques. From the reconstructed 3D surfaces, it is also possible to generate 2D profiles or elevation contour lines for use in regular GIS or CAD packages. A number of applications are described in this paper, which may illustrate the possible benefits of using laser scanning as a technique in engineering geological practice and rese...

Procedia Computer Science

Geological Quarterly, Apr 1, 2013

Fuel and Energy Abstracts, 2011

Erratum to "Mineral waters in Slovakia -Evaluation of chemical composition stability using both h... more Erratum to "Mineral waters in Slovakia -Evaluation of chemical composition stability using both historical records and the most recent data" [