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The main goal of this paper was to estimate the heat exchange rock mass volume of a hot dry rock (HDR) geothermal reservoir based on microseismicity location. There are two types of recorded microseismicity: induced by flowing fluid (wet microseismicity) and induced by stress mechanisms (dry microseismicity). In this paper, an attempt was made to extract events associated with the injected fluid flow. The authors rejected dry microseismic events with no hydraulic connection with the stimulated fracture network so as to avoid overestimating the reservoir volume. The proposed algorithm, which includes the collapsing method, automatic cluster detection, and spatiotemporal cluster evolution from the injection well, was applied to the microseismic dataset recorded during stimulation of the Soultz-sous-Forets HDR field in September 1993. The stimulated reservoir volume obtained from wet seismicity using convex hulls is approximately five times smaller than the volume obtained from the primary cloud of located events.
Elżbieta Węglińska; Andrzej Leśniak. Induced Seismicity and Detailed Fracture Mapping as Tools for Evaluating HDR Reservoir Volume. Energies 2021, 14, 2593 .
AMA StyleElżbieta Węglińska, Andrzej Leśniak. Induced Seismicity and Detailed Fracture Mapping as Tools for Evaluating HDR Reservoir Volume. Energies. 2021; 14 (9):2593.
Chicago/Turabian StyleElżbieta Węglińska; Andrzej Leśniak. 2021. "Induced Seismicity and Detailed Fracture Mapping as Tools for Evaluating HDR Reservoir Volume." Energies 14, no. 9: 2593.
The contamination of aquatic sediments by metals is a worldwide phenomenon and its assessment is a fairly complex issue, as numerous factors affect the distribution of particular contaminants in the environment, as well as their bioavailability. Wigry Lake, as the object of this study, is almost a perfect water body for such considerations. It has been well investigated and densely sampled (up to 459 sediment samples). The quantities of seven metals were determined using the atomic absorption spectrometry (AAS) or inductively coupled plasma (ICP)-MS methods, following previous extraction in a microwave oven. The levels of concentration of the examined elements were as follows (min–max (mg·kg−1)): Cd—0.003–3.060; Cr—0.20–22.61; Cu—0.02–59.70; Fe—80–32,857; Mn—18–1698; Pb—7.0–107.5; Zn—3.1–632.1. Significant differences were also registered in terms of particular metal concentrations in different sediment types found at the lake bottom. Five different geochemical backgrounds and sediment quality guidelines implemented in the study enabled a very scrupulous contamination assessment of the lake sediments’ condition, as well as the evaluation of the natural and anthropogenic contribution to the enrichment of examined sediments in metals. Although Wigry Lake is situated in a pristine region, it is still subject to anthropopressure, which seems to be the lowest in respect to Cr and Mn, while the highest in the case of Pb. The chemoecological state of the lake was ultimately assessed as good. The study highlighted the necessity of an integrated approach to the assessment of contamination or pollution in the course of an environmental research.
Anna Kostka; Andrzej Leśniak. Natural and Anthropogenic Origin of Metals in Lacustrine Sediments; Assessment and Consequences—A Case Study of Wigry Lake (Poland). Minerals 2021, 11, 158 .
AMA StyleAnna Kostka, Andrzej Leśniak. Natural and Anthropogenic Origin of Metals in Lacustrine Sediments; Assessment and Consequences—A Case Study of Wigry Lake (Poland). Minerals. 2021; 11 (2):158.
Chicago/Turabian StyleAnna Kostka; Andrzej Leśniak. 2021. "Natural and Anthropogenic Origin of Metals in Lacustrine Sediments; Assessment and Consequences—A Case Study of Wigry Lake (Poland)." Minerals 11, no. 2: 158.
In rock mass disturbed by mining activity, distortions in the stress balance may lead to seismic energy being emitted in reactivated seismogenic structures. One way of increasing the imaging resolution of these seismically active structures is through relocation, which itself can be achieved using the cloud collapsing method. This method partially eliminates perturbations in the location of seismic energy sources concerning the actual positions of these sources. It enables events to be grouped into spatially ordered structures that may correspond to actual tectonic structures, such as fractures, fissures, or faults. We present the results of applying the collapsing method in mining seismology using a cloud of located events recorded during mining activity at one of the coalfaces in the Bobrek hard coal mine. The relocation procedure was applied to all the foci of events recorded during mining activity on face 3/503 between April 2009 and July 2010. In the relocated point cloud, two types of the linear structure responsible for generating events are automatically distinguished using the HDBSCAN algorithm: structures directly related to mining activity and structures associated with local tectonics. The location of the separated structures of the first type corresponds to the range of coalface 3/503 and the shafts delimiting earlier mined seams 507 and 509 located below. The isolated structures of the second type, with almost vertical orientation, are associated with existing zones of discontinuity that become seismically active as a result of mining activity. The identified structures lie near the biggest events recorded, which is evidence that these structures may correspond to real discontinuity zones.
Andrzej Leśniak; Elżbieta Śledź; Katarzyna Mirek. Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland. Energies 2020, 13, 4622 .
AMA StyleAndrzej Leśniak, Elżbieta Śledź, Katarzyna Mirek. Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland. Energies. 2020; 13 (18):4622.
Chicago/Turabian StyleAndrzej Leśniak; Elżbieta Śledź; Katarzyna Mirek. 2020. "Detailed Recognition of Seismogenic Structures Activated during Underground Coal Mining: A Case Study from Bobrek Mine, Poland." Energies 13, no. 18: 4622.
This paper aims to provide a quantitative understanding of the performance of numerical modeling of a wave field equation using general-purpose processors. In particular, this article presents the most important aspects related to the memory workloads and execution time of the numerical modeling of both acoustic and fully elastic waves in isotropic and anisotropic mediums. The results presented in this article were calculated for the staggered grid finite difference method. Our results show that the more realistic the seismic wave simulations that are performed, the more the demand for memory and the computational capacity of the computing environment increases. The results presented in this article allow the estimation of the memory requirements and computational time of wavefield modeling for the considered model (acoustic, elastic or anisotropic) so that their feasibility can be assessed in a given computing environment and within an acceptable time. Understanding the numerical modeling performance is especially important when graphical processing units (GPU) are utilized to satisfy the intensive calculations of three-dimensional seismic forward modeling.
Anna Franczyk; Damian Gwiżdż; Andrzej Leśniak. Performance of 3D Wave Field Modeling Using the Staggered Grid Finite Difference Method with General-Purpose Processors. Energies 2020, 13, 4573 .
AMA StyleAnna Franczyk, Damian Gwiżdż, Andrzej Leśniak. Performance of 3D Wave Field Modeling Using the Staggered Grid Finite Difference Method with General-Purpose Processors. Energies. 2020; 13 (17):4573.
Chicago/Turabian StyleAnna Franczyk; Damian Gwiżdż; Andrzej Leśniak. 2020. "Performance of 3D Wave Field Modeling Using the Staggered Grid Finite Difference Method with General-Purpose Processors." Energies 13, no. 17: 4573.
Andrzej Leśniak; Stanisława Porzycka-Strzelczyk. The pattern of surface deformations in the Dąbrowa Basin (Poland) based on PSInSAR analysis. Geological Quarterly 2020, 64, 304 .
AMA StyleAndrzej Leśniak, Stanisława Porzycka-Strzelczyk. The pattern of surface deformations in the Dąbrowa Basin (Poland) based on PSInSAR analysis. Geological Quarterly. 2020; 64 (2):304.
Chicago/Turabian StyleAndrzej Leśniak; Stanisława Porzycka-Strzelczyk. 2020. "The pattern of surface deformations in the Dąbrowa Basin (Poland) based on PSInSAR analysis." Geological Quarterly 64, no. 2: 304.
The article presents a new quantitative approach to studying the feeling of safety and risk perception and proposes a new method for determining the intensity of this phenomenon based on data from the National Safety Risk Map in Krakow. The quantitative methods used for data analysis enabled the authors to identify a clustered process in their research, as well as to locate clusters and to perform data generalization. Based on ungeneralized and generalized data obtained through kernel density estimation, the authors determined the density distribution for two categories of offense (acts of vandalism and alcohol consumption in prohibited places) in Krakow. The final stage of the analysis involved estimating the degree of perceived risk associated with public order offenses which the authors defined using the Perceived Risk Intensity Coefficient (Ipr). This coefficient was calculated as the ratio of ungeneralized density distribution to generalized distribution. As a result, the authors identified those areas where the Ipr coefficient was highest, i.e. those places in which local residents’ threat perception was most intense.
Agnieszka Polończyk; Andrzej Leśniak. Mapping public order offenses: a study of the spatial distribution of perceived risk intensity in the city of Krakow, Poland. Cartography and Geographic Information Science 2019, 47, 171 -191.
AMA StyleAgnieszka Polończyk, Andrzej Leśniak. Mapping public order offenses: a study of the spatial distribution of perceived risk intensity in the city of Krakow, Poland. Cartography and Geographic Information Science. 2019; 47 (2):171-191.
Chicago/Turabian StyleAgnieszka Polończyk; Andrzej Leśniak. 2019. "Mapping public order offenses: a study of the spatial distribution of perceived risk intensity in the city of Krakow, Poland." Cartography and Geographic Information Science 47, no. 2: 171-191.
Pareto joint inversion for two or more data sets is an attractive and promising tool which eliminates target functions weighing and scaling, providing a set of acceptable solutions composing a Pareto front. In former author’s study MARIA (Modular Approach Robust Inversion Algorithm) was created as a flexible software based on global optimization engine (PSO) to obtain model parameters in process of Pareto joint inversion of two geophysical data sets. 2D magnetotelluric and gravity data were used for preliminary tests, but the software is ready to handle data from more than two geophysical methods. In this contribution, the authors’ magnetometric forward solver was implemented and integrated with MARIA. The gravity and magnetometry forward solver was verified on synthetic models. The tests were performed for different models of a dyke and showed, that even when the starting model is a homogeneous area without anomaly, it is possible to recover the shape of a small detail of the real model. Results showed that the group analysis of models on the Pareto front gives more information than the single best model. The final stage of interpretation is the raster map of Pareto front solutions analysis.
Tomasz Danek; Andrzej Leśniak; Katarzyna Miernik; Elżbieta Śledź. Pareto Joint Inversion of 2D magnetometric and gravity data- synthetic study. E3S Web of Conferences 2019, 133, 01009 .
AMA StyleTomasz Danek, Andrzej Leśniak, Katarzyna Miernik, Elżbieta Śledź. Pareto Joint Inversion of 2D magnetometric and gravity data- synthetic study. E3S Web of Conferences. 2019; 133 ():01009.
Chicago/Turabian StyleTomasz Danek; Andrzej Leśniak; Katarzyna Miernik; Elżbieta Śledź. 2019. "Pareto Joint Inversion of 2D magnetometric and gravity data- synthetic study." E3S Web of Conferences 133, no. : 01009.
Heavy metals which pollute aquatic environments typically bond with bottom sediments and the analysis of the spatial distribution of metals allows to assess the geochemical purity of deposits and to identify the potential pollution sources. Research carried out on the Wigry Lake involved the collection of almost 500 samples of sediments, and the specification of the depth of their residence (0.2–71.4 m) as well as the level of concentration of three metals: Fe (80.3–32 857 mg kg−1), Mn (17.8–1698 mg kg−1) and Zn (3.14–632 mg kg−1). The geochemical and bathymetric data was interpolated using geostatistical methods and mapped with the consideration of 5 types of sediments: lacustrine chalk, carbonate gyttja, fluvial-lacustrine sediment, organic gyttja and clastic sediment. As a result, a significant increase in the concentration of metals was revealed in deeper zones, at a considerable distance from the lake shore, wherein the respective values of correlation coefficients were as follows: depth–Mn 0.77; depth–Fe 0.60; depth–Zn 0.58. A strong dependency between the concentration of analysed metals and the type of sediment, attributed to the granular and chemical composition of sediments, was also revealed. Correlations between individual metallic pairs (Fe–Mn 0.77; Fe–Zn 0.80; Mn–Zn 0.75) indicated that similar factors influence spatial distribution of metals in sediments. The implementation of 3 different geochemical backgrounds allowed to conclude that the Wigry Lake is slightly polluted with the analysed metals, and that the origin of Mn is mainly natural, while in the case of Fe and Zn anthropogenic influence can also be identified.
Anna Kostka; Andrzej Leśniak. Spatial and geochemical aspects of heavy metal distribution in lacustrine sediments, using the example of Lake Wigry (Poland). Chemosphere 2019, 240, 124879 .
AMA StyleAnna Kostka, Andrzej Leśniak. Spatial and geochemical aspects of heavy metal distribution in lacustrine sediments, using the example of Lake Wigry (Poland). Chemosphere. 2019; 240 ():124879.
Chicago/Turabian StyleAnna Kostka; Andrzej Leśniak. 2019. "Spatial and geochemical aspects of heavy metal distribution in lacustrine sediments, using the example of Lake Wigry (Poland)." Chemosphere 240, no. : 124879.
The physical condition of earthen levees changes over time. Levee weakening can be caused by the leaching of fine grains of soil or by animal activity. Weakened areas can potentially cause destabilization or even collapse. Assessment of the physical condition of levees using GPR and geodetic measurements does not always correctly detect areas of increased permeability. Thermal anomalies, caused by existing zones of high permeability, are observed in levees during the transition of flood waves. They are generated by rapid infiltration of water with a different temperature than the temperature inside the levee. Therefore, inner thermal measurements may be used to detect places with higher permeability. This research was realized with 2D numerical modelling. Main aim was test possibility of using temperature sensors in weak zone detection. Test with different theoretical permeabilities proved that it is possible only in specific condition (i.e. thermal contrast). The geometry and geomechanical properties of the studied levee were taken from the ISMOP project (polish acronym: Computer system for monitoring river embankments).
Maciej Dwornik; Anna Franczyk; Andrzej Leśniak. Identification of zones of increased permeability using numerical modelling of temperature distribution - an ISMOP case study. E3S Web of Conferences 2018, 66, 03002 .
AMA StyleMaciej Dwornik, Anna Franczyk, Andrzej Leśniak. Identification of zones of increased permeability using numerical modelling of temperature distribution - an ISMOP case study. E3S Web of Conferences. 2018; 66 ():03002.
Chicago/Turabian StyleMaciej Dwornik; Anna Franczyk; Andrzej Leśniak. 2018. "Identification of zones of increased permeability using numerical modelling of temperature distribution - an ISMOP case study." E3S Web of Conferences 66, no. : 03002.
Mirosław Słowakiewicz; Martin Blumenberg; Dariusz Więcław; Heinz-Gerd Röhling; Georg Scheeder; Katja Hindenberg; Andrzej Leśniak; Erdem F. Idiz; Maurice E. Tucker; Richard D. Pancost; Maciej J. Kotarba; Johannes P. Gerling. Corrigendum to “Zechstein main Dolomite oil characteristics in the Southern Permian Basin: I. Polish and German sectors” [JMPG 93 (May 2018) 356–375]. Marine and Petroleum Geology 2018, 96, 647 -648.
AMA StyleMirosław Słowakiewicz, Martin Blumenberg, Dariusz Więcław, Heinz-Gerd Röhling, Georg Scheeder, Katja Hindenberg, Andrzej Leśniak, Erdem F. Idiz, Maurice E. Tucker, Richard D. Pancost, Maciej J. Kotarba, Johannes P. Gerling. Corrigendum to “Zechstein main Dolomite oil characteristics in the Southern Permian Basin: I. Polish and German sectors” [JMPG 93 (May 2018) 356–375]. Marine and Petroleum Geology. 2018; 96 ():647-648.
Chicago/Turabian StyleMirosław Słowakiewicz; Martin Blumenberg; Dariusz Więcław; Heinz-Gerd Röhling; Georg Scheeder; Katja Hindenberg; Andrzej Leśniak; Erdem F. Idiz; Maurice E. Tucker; Richard D. Pancost; Maciej J. Kotarba; Johannes P. Gerling. 2018. "Corrigendum to “Zechstein main Dolomite oil characteristics in the Southern Permian Basin: I. Polish and German sectors” [JMPG 93 (May 2018) 356–375]." Marine and Petroleum Geology 96, no. : 647-648.
The article presents the results of a study on the spatial distribution of acts of vandalism and alcohol consumption in prohibited areas. The study made use of data on offences committed in Krakow, reported by citizens of the city and illustrated on an interactive map - the National Safety Risk Map. The gathered data was calibrated and generalised. Then, a map was prepared illustrating the spatial distribution of both categories of offences in different sub-districts in Krakow, as well as a choropleth map of both types of offence. Two methods were used for examining the interrelationship between these offences - regression analysis using the Poisson regression model with a linear correction of the dispersion and dual kernel density estimation with a "hot spot" analysis. The study constitutes the first systematic attempt to analyse NSRM data with regard to the spatial distribution and spatial co-occurrence of two common offences in Krakow.
Agnieszka Polonczyk; Andrzej Lesniak. A Spatial Analysis of Selected Categories of Offences in Krakow Based on Data from the National Safety Risk Map. 2018 Baltic Geodetic Congress (BGC Geomatics) 2018, 17 -22.
AMA StyleAgnieszka Polonczyk, Andrzej Lesniak. A Spatial Analysis of Selected Categories of Offences in Krakow Based on Data from the National Safety Risk Map. 2018 Baltic Geodetic Congress (BGC Geomatics). 2018; ():17-22.
Chicago/Turabian StyleAgnieszka Polonczyk; Andrzej Lesniak. 2018. "A Spatial Analysis of Selected Categories of Offences in Krakow Based on Data from the National Safety Risk Map." 2018 Baltic Geodetic Congress (BGC Geomatics) , no. : 17-22.
The article presents an analysis of the spatial distribution of selected categories of offences in the city of Krakow. The data was taken from reports made by citizens of Krakow via the National Safety Risk Map. The first stage involved calibrating the data. Then, spatial clusters of the data were identified due to the fact that in some areas of the city the points occurred in large concentrations, which could have a significant impact on the spatial analysis of the described phenomena. As a result of clustering, a generalised distribution of data was obtained and presented on a map. Based on calculations, a comparative analysis was performed on data before and after the generalisation. The method employed was the kernel density estimation. A comparison of the data within the boundaries of different sub-districts made it possible to assess whether generalisation significantly affects the density distribution of the analysed phenomena.
Agnieszka Polonczyk; Andrzej Lesniak. The Impact of Generalised Spatial Data on the Incidence Density of Selected Offences in Krakow. 2018 Baltic Geodetic Congress (BGC Geomatics) 2018, 328 -334.
AMA StyleAgnieszka Polonczyk, Andrzej Lesniak. The Impact of Generalised Spatial Data on the Incidence Density of Selected Offences in Krakow. 2018 Baltic Geodetic Congress (BGC Geomatics). 2018; ():328-334.
Chicago/Turabian StyleAgnieszka Polonczyk; Andrzej Lesniak. 2018. "The Impact of Generalised Spatial Data on the Incidence Density of Selected Offences in Krakow." 2018 Baltic Geodetic Congress (BGC Geomatics) , no. : 328-334.
Geochemical analyses were used to classify 39 Zechstein (Late Permian, Lopingian) Main Dolomite (Ca2) crude oil samples from fields in the eastern and southern sector of the Southern Permian Basin (SPB) of Europe and to provide new insights into the origin of the oil. Geochemical data indicate that Ca2 oils were generated in the early-to-late oil window and are mostly non-waxy oils. Various biomarker and stable carbon isotopic ratios were used to identify source and depositional settings for source rocks of Ca2 oils arranged within 10 distinct oil groups. Specifically, the geochemical analyses and oil-oil correlations revealed a set of characteristic biomarkers including an even-over-odd predominance (EOP) for the C20-30n-alkanes, C40 carotenoid occurrence (isorenieratane, chlorobactane, β-isorenieratane), bisnorhopane/hopane (BNH/H) ratios >0.1, high abundances of C35 homohopanes and elevated concentrations of C32 and C34 homohopanes, a predominance of C29 homologues among 4-desmethyl steranes in the majority of oil samples, and a high abundance of diasteranes. Stable carbon isotopes and biomarkers provided ample evidence that Ca2 oils were generated from predominantly algal-rich marly carbonate/evaporite source rocks located in the lower slope/shallow-basin and lagoonal facies of the Ca2 basin, all deposited under suboxic-anoxic (euxinic) conditions. In the case of all higher maturity oils, the source rocks could not be reliably identified but high (>2) C24Tet/C23 values suggest a carbonate-evaporite depositional setting.
Mirosław Słowakiewicz; Martin Blumenberg; Dariusz Więcław; Heinz-Gerd Röhling; Georg Scheeder; Katja Hindenberg; Andrzej Leśniak; Erdem F. Idiz; Maurice E. Tucker; Richard D. Pancost; Maciej J. Kotarba; Johannes P. Gerling. Zechstein Main Dolomite oil characteristics in the Southern Permian Basin: I. Polish and German sectors. Marine and Petroleum Geology 2018, 93, 356 -375.
AMA StyleMirosław Słowakiewicz, Martin Blumenberg, Dariusz Więcław, Heinz-Gerd Röhling, Georg Scheeder, Katja Hindenberg, Andrzej Leśniak, Erdem F. Idiz, Maurice E. Tucker, Richard D. Pancost, Maciej J. Kotarba, Johannes P. Gerling. Zechstein Main Dolomite oil characteristics in the Southern Permian Basin: I. Polish and German sectors. Marine and Petroleum Geology. 2018; 93 ():356-375.
Chicago/Turabian StyleMirosław Słowakiewicz; Martin Blumenberg; Dariusz Więcław; Heinz-Gerd Röhling; Georg Scheeder; Katja Hindenberg; Andrzej Leśniak; Erdem F. Idiz; Maurice E. Tucker; Richard D. Pancost; Maciej J. Kotarba; Johannes P. Gerling. 2018. "Zechstein Main Dolomite oil characteristics in the Southern Permian Basin: I. Polish and German sectors." Marine and Petroleum Geology 93, no. : 356-375.
This paper reviews existing remote sensing methods of road damage detection and demonstrates the possibility of using DInSAR (Differential Interferometry SAR) method to identify endangered road sections. In this study two radar images collected by Sentinel-1 satellite have been used. Images were acquired with 24 days interval in 2015. The analysis allowed to estimate the scale of the post-mining deformation that occurred in Upper Silesia and to indicate areas where road infrastructure is particularly vulnerable to damage.
Radosław Murdzek; Hubert Malik; Andrzej Leśniak. The use of the DInSAR method in the monitoring of road damage caused by mining activities. E3S Web of Conferences 2018, 36, 02005 .
AMA StyleRadosław Murdzek, Hubert Malik, Andrzej Leśniak. The use of the DInSAR method in the monitoring of road damage caused by mining activities. E3S Web of Conferences. 2018; 36 ():02005.
Chicago/Turabian StyleRadosław Murdzek; Hubert Malik; Andrzej Leśniak. 2018. "The use of the DInSAR method in the monitoring of road damage caused by mining activities." E3S Web of Conferences 36, no. : 02005.
Among the technologies used to improve functioning of local governments the geographic information systems (GIS) are widely used. GIS tools allow to simultaneously integrate spatial data resources, analyse them, process and use them to make strategic decisions. Nowadays GIS analysis is widely used in spatial planning or environmental protection. In these applications a number of spatial information are utilized, but rarely it is an information about environmental hazards. This paper includes information about ground subsidence that occurred in USCB mining area into GIS analysis. Monitoring of this phenomenon can be carried out using the radar differential interferometry (DInSAR) method.
Radosław Murdzek; Hubert Malik; Andrzej Leśniak. Ground subsidence information as a valuable layer in GIS analysis. E3S Web of Conferences 2018, 36, 02006 .
AMA StyleRadosław Murdzek, Hubert Malik, Andrzej Leśniak. Ground subsidence information as a valuable layer in GIS analysis. E3S Web of Conferences. 2018; 36 ():02006.
Chicago/Turabian StyleRadosław Murdzek; Hubert Malik; Andrzej Leśniak. 2018. "Ground subsidence information as a valuable layer in GIS analysis." E3S Web of Conferences 36, no. : 02006.
B. Bukowska-Belniak; A. Borecka; Andrzej Lesniak. The continuous thermal imaging of the flood embankment to identify location of the leaks. 2018 Quantitative InfraRed Thermography 2018, 1 .
AMA StyleB. Bukowska-Belniak, A. Borecka, Andrzej Lesniak. The continuous thermal imaging of the flood embankment to identify location of the leaks. 2018 Quantitative InfraRed Thermography. 2018; ():1.
Chicago/Turabian StyleB. Bukowska-Belniak; A. Borecka; Andrzej Lesniak. 2018. "The continuous thermal imaging of the flood embankment to identify location of the leaks." 2018 Quantitative InfraRed Thermography , no. : 1.
In order to learn about the phenomena occurring in flood embankment under the influence of external factors, including the increasing water level in the river during floods, a Computer System for Monitoring River Embankment (ISMOP) was developed using an experimental flood embankment. The project was carried out by a consortium consisting of AGH University of Science and Technology departments (Computer Science, Hydrogeology and Engineering Geology, Geoinformatics and Applied Computer Science and two companies (NEOSENTIO and SWECO Hydroprojekt Kraków) in co-operation with the Czernichów Community Council. An experimental flood embankment was built with two parallel sections with a length of 150 m and a height of 4.5 m, connected by a meandering, creating a reservoir that can be filled with water. For the construction of the embankment, different types of soils were used in all the five sections. Inside the flood embankment 1300 sensors are placed, including sensors for temperature, pore pressure, vertical displacements, as well as inclinometers. Also fiber optic strands, capable of measuring the temperature of the flood embankment on the upstream side, are located inside the experimental embankment [ismop.pl]. Together with the real experiments, numerical modelling using the Itasca Flac 2D 7.0 was performed in order to describe the impact of water pressing on the flood embankment and the impact of increasing and decreasing reservoir water level on the phenomena that occur within the embankment. The results of modelling compared with the real sensor data allowed the evaluation of the current and future state of the embankment. Based on the data measured by the sensors and data received during the numerical modelling, a group of algorithms that allowed detection of anomaly phenomena was developed.
Monika Chuchro; Anna Franczyk; Barbara Bukowska-Belniak; Andrzej Leśniak. Reducing Flood Risk using Computer System for Monitoring River Embankments. Ochrona Srodowiska i Zasobów Naturalnych 2017, 28, 11 -16.
AMA StyleMonika Chuchro, Anna Franczyk, Barbara Bukowska-Belniak, Andrzej Leśniak. Reducing Flood Risk using Computer System for Monitoring River Embankments. Ochrona Srodowiska i Zasobów Naturalnych. 2017; 28 (3):11-16.
Chicago/Turabian StyleMonika Chuchro; Anna Franczyk; Barbara Bukowska-Belniak; Andrzej Leśniak. 2017. "Reducing Flood Risk using Computer System for Monitoring River Embankments." Ochrona Srodowiska i Zasobów Naturalnych 28, no. 3: 11-16.
Storing large amounts of spatial data in GIS systems is problematic. This problem is growing due to ever- increasing data production from a variety of data sources. The phenomenon of collecting huge amounts of data is called Big Data. Existing solutions are capable of processing and storing large volumes of spatial data. These solutions also show new approaches to data processing. Conventional techniques work with ordinary data but are not suitable for large datasets. Their efficient action is possible only when connected to distributed file systems and algorithms able to reduce tasks. This review focuses on the characteristics of large spatial data and discusses opportunities offered by spatial big data systems. The work also draws attention to the problems of indexing and access to data, and proposed solutions in this area.
Przemysław Lisowski; Adam Piórkowski; Andrzej Lesniak. Tools for the Storage and Analysis of Spatial Big Data. Proccedings of 10th International Conference "Environmental Engineering" 2017, 1 .
AMA StylePrzemysław Lisowski, Adam Piórkowski, Andrzej Lesniak. Tools for the Storage and Analysis of Spatial Big Data. Proccedings of 10th International Conference "Environmental Engineering". 2017; ():1.
Chicago/Turabian StylePrzemysław Lisowski; Adam Piórkowski; Andrzej Lesniak. 2017. "Tools for the Storage and Analysis of Spatial Big Data." Proccedings of 10th International Conference "Environmental Engineering" , no. : 1.
The time reversal method has become a standard technique for the location of seismic sources. It has been used both for acoustic and elastic numerical modelling and for 2D and 3D propagation models. Although there are many studies concerning its application to point sources, little so far has been done to generalise the time reversal method to the study of sequences of seismic events. The need to describe such processes better motivates the analysis presented in this paper. The synthetic time reversal imaging experiments presented in this work were conducted for sources with the same origin time as well as for the sources with a slight delay in origin time. For efficient visualisation of the seismic wave propagation and interference, a new coefficient—peak average power ratio—was introduced. The paper also presents a comparison of visualisation based on the proposed coefficient against a commonly used visualisation based on a maximum value.
Anna Franczyk; Andrzej Leśniak; Damian Gwiżdż. Time reversal seismic source imaging using peak average power ratio (PAPR) parameter. Acta Geophysica 2017, 65, 299 -308.
AMA StyleAnna Franczyk, Andrzej Leśniak, Damian Gwiżdż. Time reversal seismic source imaging using peak average power ratio (PAPR) parameter. Acta Geophysica. 2017; 65 (2):299-308.
Chicago/Turabian StyleAnna Franczyk; Andrzej Leśniak; Damian Gwiżdż. 2017. "Time reversal seismic source imaging using peak average power ratio (PAPR) parameter." Acta Geophysica 65, no. 2: 299-308.
Andrzej Leśniak; Agh Akademia Górniczo-Hutnicza; Michał Lupa. ANALYSIS OF THE POLISH HOME ARMY DROP ZONES DURING WORLD WAR II, USING GEOGRAPHIC INFORMATION SYSTEMS. Geomatics, Landmanagement and Landscape 2017, 3, 89 -105.
AMA StyleAndrzej Leśniak, Agh Akademia Górniczo-Hutnicza, Michał Lupa. ANALYSIS OF THE POLISH HOME ARMY DROP ZONES DURING WORLD WAR II, USING GEOGRAPHIC INFORMATION SYSTEMS. Geomatics, Landmanagement and Landscape. 2017; 3 ():89-105.
Chicago/Turabian StyleAndrzej Leśniak; Agh Akademia Górniczo-Hutnicza; Michał Lupa. 2017. "ANALYSIS OF THE POLISH HOME ARMY DROP ZONES DURING WORLD WAR II, USING GEOGRAPHIC INFORMATION SYSTEMS." Geomatics, Landmanagement and Landscape 3, no. : 89-105.