Dwornik, Maciej
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nauki o Ziemi i środowisku
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Item type:Article, Access status: Open Access , A Big Data processing strategy for hybrid interpretation of flood embankment multisensor data(Wydawnictwa AGH, 2016) Chuchro, Monika; Franczyk, Anna; Dwornik, Maciej; Leśniak, AndrzejThe assessment of flood embankments is a key component of a country’s comprehensive flood protection. Proper and early information on the possible instability of a flood embankment can make it possible to take preventative action. The assessment method proposed by the ISMOP project is based on a strategy of processing huge data sets (Big Data). The detection of flood embankment anomalies can take two analysis paths. The first involves the computation of numerical models and comparing them with real data measured on a flood embankment. This is the path of model-driven analysis. The second solution is data-driven, meaning time series are analysed in order to detect deviations from average values. Flood embankments are assessed based on the results of model-driven and data-driven analyses and information from preprocessing. An alarm is triggered if a critical value is exceeded in one or both paths of analysis. Tests on synthetic data demonstrate the high efficiency of the chosen methods for assessing the state of flood embankments.Item type:Article, Access status: Open Access , Analysis of stability levee during different flooding wave stages(Wydawnictwa AGH, 2016) Dwornik, Maciej; Franczyk, Anna; Krawiec, KrzysztofThe stability of levee depends mainly on mechanical and hydromechanical properties of material used for its construction.Item type:Article, Access status: Open Access , Optimal selection of numerical models for flood embankment pore pressure and temperature data(Wydawnictwa AGH, 2017) Chuchro, Monika; Dwornik, Maciej; Szostek, Kamil; Leśniak, AndrzejThe aim of the ISMOP project is to study processes in earthen flood embankments: water filtration, pore pressure changes, and temperature changes due to varying water levels in the riverbed. Developing a system for continuous monitoring of flood embankment stability is the main goal of this project. A full-size earthen flood embankment with built-in sensors was built in Czernichow and used to conduct experiments involving the simulation of different flood waves, with parameters mostly measured at time intervals of 15 minutes. Numerical modelling—in addition to providing information about phenomena occurring in the embankment due to external factors and changes in water level—could be used to assess the state of the embankment. Modelling was performed using Itasca Flac 2D 7.0 with an assumed grid cell size of 10x10 cm. The water level in the embankment simulated the water flow in the Wisła River and the temperature of the air and water. Data about the state of the flood embankment was exported every hour. Using numerical models and real experiment data, a model-driven module was used to perform comparisons. Analyses of each half-section of the flood embankment were carried out separately using similarity measures and an aggregate window. For the tests, the North-West (NW) half cross-section of the embankment was chosen, which contains pore pressure and temperature sensors UT6 to UT10. The water level in the embankment was raised to a height of 3m, the best numerical model was considered the one that best matched the actual data recorded by the sensors during the experiment. The experiment period was from 9pm on 29/08/2016 to 9am on 03/09/2016. Seventeen numerical models of the water level rising to 2, 3, and 4 meters were compared against real experimental data from the NW half cross-section. The first step was to verify the similarity between the incoming data from the sensors. If the correlation value exceeded 0.8, the data from the sensors was averaged. The experimental data was then compared against the numerical models using least absolute deviations L1-Norm. The L1-Norm varied from 26 to 32, depending on window length and the numerical model used.Item type:Article, Access status: Open Access , Analysis of annual temperature distribution inside the experimental embankment(Wydawnictwa AGH, 2017) Bukowska-Belniak, Barbara; Dwornik, Maciej; Leśniak, AndrzejThe aim of this paper is analysis of temperatures distribution inside experimental embankment from August 2015 to September 2016. Analysis was carried out in order to interpretation of the results of the flood experiments performed on the experimental embankment. The reference for year temperature changes in the embankment at various depths was obtained. A simplified model of temperature changes depending on the depth was made. The model parameters which can be used for modelling the temperatures in the embankment during the experiments were estimated.Item type:Article, Access status: Open Access , How fluids infiltrate through fractures and change metamorphic rocks - a case study from northern Spitsbergen(Wydawnictwa AGH, 2016) Faehnrich, Karol; Kośmińska, Karolina; Majka, Jarosław ; Dwornik, MaciejMetasomatism is a process leading to changes in the chemical composition of a rock or its portion. It involves introduction or removal of chemical components due to the interaction of the rock with aqueous fluid (Zharikov et al. 2007).Item type:Article, Access status: Open Access , Inversion of seismic tomography data by Metropolis and simulated annealing algorithm(Wydawnictwa AGH, 2012) Dwornik, MaciejInversion of seismic tomography is non-uniqueness and bad-conditioned problem. Reconstruction of velocity field is a process of minimization error function between estimated and received travel times. Classical, deterministic method, like matrix decomposition or conjugate gradient, is known for finish calculation in local minimums. Other problems with deterministic methods were application of constraints to the solution. Stochastic algorithms are methods that can be helpful in solving inverse problem in seismic tomography. This paper presents application of the following two stochastic algorithms to reconstruct velocity field: Metropolis algorithm (MA) and simulated algorithm (SA).Item type:Article, Access status: Open Access , Cellular automata for seismic travel time estimation(Wydawnictwa AGH, 2012) Szostek, Kamil; Dwornik, MaciejIn this work, the application of the cellular automata for the seismic first breaks time estimation is presented. Cellular automata (CA) algorithms are usually described by set of simple rules applied onto the grid of cells, which can represent one of the few different discrete states. In spite of this simplicity, these algorithms can still simulate variety of complex physical processes, i.e. model the fluids or gases behavior, but also simulate and predict forests fire or the spread of diseases (Turcotte 1997).Item type:Article, Access status: Open Access , Welcome in Herlandia 2014 XVth International Conference of Young Geologists Her'lany 2014 Międzybrodzie Żywieckie, Poland, May, 8th-10th 2014(Wydawnictwa AGH, 2014) Kośmińska, Karolina; Dwornik, Maciej; Manecki, Maciej; Zahradníková, Barbara; Kováčová, Marianna; Zahradník, Leonard; Gregáňová, Margaréta; Kondela, Julián; Štrba, L'ubomír; Vizi, Ladislav; Bazarnik, Jakub; Majka, Jarosław ; Kwaśniak-Kominek, Monika; Kośmińska, KarolinaThe 15th International Conference of Young Geologists was held in the Polish Outer Carpathians, in Międzybrodzie Żywieckie, located in the Beskid Mały Mts.Item type:Article, Access status: Open Access , Influence of initial water saturation in earthen levees on results of numerical modelling of infiltration processes(Wydawnictwa AGH, 2017) Dwornik, Maciej; Franczyk, Anna; Leśniak, Andrzej; Krawiec, KrzysztofLevees in Poland are mostly earthen constructions. The stability of earthen levees depends largely on factors such as the construction material, meteorological conditions and natural elements. The influence of initial water saturation of pore space on levee stability is analysed in this paper. Analysis was performed using numerical modelling and water pore pressure results were compared against data obtained from sensors located in a levee. The numerical modelling shows the moderate influence of initial water level on distribution of water pore pressure during high water level.Item type:Article, Access status: Open Access , Influence of resolution in spatial and time for numerical modeling of levees(Wydawnictwa AGH, 2015) Dwornik, Maciej; Pięta, AnnaStability of geotechnical constructions, such as levees, is one of the most important issues for urban areas. The precise prediction of levees destruction during the f lood can not only save human lives and properties, but also protect the natural environment (Krzhizhanovskaya et al. 2011).