TY  - ART
AU  - Halmai, Ákos
TI  - Example code for "Paul Bourke, 1998: Determining whether or not a polygon (2D) has its vertices ordered clockwise or counter-clockwise".
PY  - 2023
UR  - https://m2.mtmt.hu/api/publication/34571802
ID  - 34571802
N1  - https://paulbourke.net/geometry/polygonmesh/AreaClockwiseConcave.txt
https://paulbourke.net/geometry/polygonmesh
AB  - # Ákos Halmai, 2023.
import math


def getArea(points) -> float:
    """Expects iterable of two-element-tuples.
    For example:
    points = ((0, 0), (1, 0), (1, 1), (0, 1), (0, 0))"""

    area = 0.0
    (x1, y1) = points[0]
    for (x2, y2) in points[1:]:
        area += x1 * y2 - y1 * x2
        (x1, y1) = (x2, y2)

    return 0.5 * area


def getAreaAbs(points) -> float:
    """Expects iterable of two-element-tuples.
    For example:
    points = ((0, 0), (1, 0), (1, 1), (0, 1), (0, 0))"""

    # Returns float (always):
    return math.fabs(getArea(points))


def getAreaPrecise(points) -> float:
    """Expects iterable of two-element-tuples.
    For example:
    points = ((0, 0), (1, 0), (1, 1), (0, 1), (0, 0))"""

    def getPartArea(points):
        (x1, y1) = points[0]
        for (x2, y2) in points[1:]:
            yield x1 * y2
            yield -y1 * x2
            (x1, y1) = (x2, y2)

    # Avoids loss of precision by tracking multiple
    # intermediate partial sums:
    return 0.5 * math.fsum(getPartArea(points))


def getAreaPreciseAbs(points) -> float:
    """Expects iterable of two-element-tuples.
    For example:
    points = ((0, 0), (1, 0), (1, 1), (0, 1), (0, 0))"""

    # Returns float (always):
    return math.fabs(getAreaPrecise(points))


def __isClockwise(*args) -> bool:
    """Private. Do not use it!"""

    (x0, y0), (x1, y1), (x2, y2), *_ = args
    return ((x1 - x0) * (y2 - y1) - (y1 - y0) * (x2 - x1)) > 0.0


def isClockwise(points) -> bool:
    """Expects iterable of two-element-tuples.
    For example:
    points = ((0, 0), (1, 0), (1, 1), (0, 1), (0, 0))"""

    return __isClockwise(*points)


def isConcave(points) -> bool:
    """Expects iterable of two-element-tuples.
    For example:
    points = ((0, 0), (1, 0), (1, 1), (0, 1), (0, 0))"""

    (x0, y0), (x1, y1), (x2, y2), *_ = points
    switch = __isClockwise((x0, y0), (x1, y1), (x2, y2))
    for (xn, yn) in points[3:]:

        if switch != __isClockwise((x1, y1), (x2, y2), (xn, yn)):
            return True

        # Delayed for performance:
        ((x0, y0), (x1, y1), (x2, y2)) = ((x1, y1), (x2, y2), (xn, yn))

    return False
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Laksono, Fx Anjar Tri
AU  - Borzi, Laura
AU  - Distefano, Salvatore
AU  - Czirok, Lili
AU  - Halmai, Ákos
AU  - Di Stefano, Agata
AU  - Kovács, János
TI  - Shoreline change dynamics along the Augusta coast, eastern Sicily, South Italy
JF  - EARTH SURFACE PROCESSES AND LANDFORMS
J2  - EARTH SURF PROCESS LANDF
VL  - 48
PY  - 2023
IS  - 9
SP  - 1
EP  - 12
PG  - 12
SN  - 0197-9337
DO  - 10.1002/esp.5644
UR  - https://m2.mtmt.hu/api/publication/34034637
ID  - 34034637
N1  - Funding Agency and Grant Number: Uj Nemzeti Kivalosag Program (UNKP) [UNKP-22-3-1]
            Funding text: Uj Nemzeti Kivalosag Program (UNKP), Grant/Award Number: UNKP-22-3-1
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Lovász, Virág
AU  - Halász, Amadé
AU  - Molnár, Péter
AU  - Karsa, Róbert
AU  - Halmai, Ákos
TI  - Application of a CNN to the Boda Claystone Formation for high-level radioactive waste disposal
JF  - SCIENTIFIC REPORTS
J2  - SCI REP
VL  - 13
PY  - 2023
IS  - 1
PG  - 16
SN  - 2045-2322
DO  - 10.1038/s41598-023-31564-1
UR  - https://m2.mtmt.hu/api/publication/33733477
ID  - 33733477
N1  - Funding Agency and Grant Number: University of Pecs
            Funding text: The Public Limited Company for Radioactive Waste Management (PURAM) greatly assisted our work by providing us with core scanning logs, scanned cores, internal reports, and core documentation. Every figure and table presented in this article is based on PURAM data. We thank them for their support. We are grateful to Dr. Gyula Konrad for proofreading. We also thank Dr. Denes Loczy for improving the quality of our English translation. We thank the Doctoral School of Earth Sciences (University of Pecs) for providing the computational power necessary for the research. Open access funding was provided by the University of Pecs. Every figure was created in ArcGIS Pro (ver.: 2.8.4; Environmental System Research Inc., Redlands, CA, USA).Open access funding was provided by University of Pecs
AB  - Nations relying on nuclear power generation face great responsibilities when designing their firmly secured final repositories. In Hungary, the potential host rock [the Boda Claystone Formation (BCF)] of the deep geological repository is under extensive examination. To promote a deeper comprehension of potential radioactive isotope transport and ultimately synthesis for site evaluation purposes, we have efficiently tailored geospatial image processing using a convolutional neural network (CNN). We customized the CNN according to the intricate nature of the fracture geometries in the BCF, enabling the recognition process to be particularly sensitive to details and to interpret them in the correct tectonic context. Furthermore, we set the highest processing scale standards to measure the performance of our model, and the testing circumstances intentionally involved various technological and geological hindrances. Our presented model reached ~ 0.85 precision, ~ 0.89 recall, an ~ 0.87 F1 score, and a ~ 2° mean error regarding dip value extraction. With the combination of a CNN and geospatial methodology, we present the description, performance, and limits of a fully automated workflow for extracting BCF fractures and their dipping data from scanned cores.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Gyenizse, Péter
AU  - Soltész, Emese
AU  - Lóczy, Dénes
AU  - Kovács, János
AU  - Nagyváradi, László
AU  - Elekes, Tibor
AU  - Gyenizse-Nagy, Sára
AU  - Németh, Gergő
AU  - Halmai, Ákos
TI  - Light Pollution Mapping in Pecs City with the Help of SQM-L and VIIRS DNB. The Effect of Public Luminaire Replacements on the Sky Background of the Urban Sky
JF  - GEOGRAPHICA PANNONICA
J2  - GEOGRAPHICA PANNONICA
VL  - 26
PY  - 2022
IS  - 4
SP  - 334
EP  - 344
PG  - 11
SN  - 0354-8724
DO  - 10.5937/gp26-39526
UR  - https://m2.mtmt.hu/api/publication/33568387
ID  - 33568387
AB  - Recently light pollution has been one of the most dynamically increasing form of environmental pollution. Light, if it arrives at the wrong place, time, quantity and quality, is harmful to human health and the physical environment-not to mention that it is a mere waste of energy. The brightness of the sky above Pécs was measured by SQM-L instruments in 2011 and 2019. Maps of the different neighbourhoods with different levels of light pollution have been prepared. In addition, special VIIRS day/night band satellite images were also analysed using QGIS software. Our investigations coincided with the modernization of street lighting in the city. The impact of LED illuminators installed along main roads in Pécs was observed locally.
LA  - English
DB  - MTMT
ER  - 

TY  - ART
AU  - Halmai, Ákos
TI  - SL3Reader
PY  - 2022
UR  - https://m2.mtmt.hu/api/publication/33741721
ID  - 33741721
AB  - It is a tiny C# app, which is able to read SL3 sonar log files made by Lowrance & Simard devices and export the frame headers into a CSV text file. For details see & cite the following publication: Halmai, Ákos; Gradwohl–Valkay, Alexandra; Czigány, Szabolcs; Ficsor, Johanna; Liptay, Zoltán Árpád; Kiss, Kinga; Lóczy, Dénes and Pirkhoffer, Ervin. 2020. "Applicability of a Recreational-Grade Interferometric Sonar for the Bathymetric Survey and Monitoring of the Drava River" ISPRS International Journal of Geo-Information 9, no. 3: 149. https://doi.org/10.3390/ijgi9030149 https://www.mdpi.com/2220-9964/9/3/149

For Hungarian readers: Halmai Ákos, Balatonyi László, Valkay Alexandra Ilona, Czigány Szabolcs, Liptay Zoltán Árpád, Pirkhoffer Ervin. 2018. Új megközelítésű mederfelmérési technikák alkalmazása kisvízfolyásokon. Védelem Tudomány – III. évfolyam 4. szám, 2018. 12. hó. http://www.vedelemtudomany.hu/articles/III/4/09-halmai-etal.pdf

Dissertation in Hungarian: https://pea.lib.pte.hu/handle/pea/24594
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Laksono, Fx Anjar Tri
AU  - Czirok, Lili
AU  - Halmai, Ákos
AU  - Kovács, János
ED  - Hatvani, István Gábor
ED  - Erdélyi, Dániel
ED  - Fedor, Ferenc
TI  - Analysis of Coastline Change on the Eastern Coast of Sicily, Italy Based on the Calculation of End Point Rate and Linear Regression Rate Statistical Parameters
T2  - GeoMATES '22 International Congress on Geomathematics in Earth- and Environmental Sciences
PB  - MTA Pécsi Akadémiai Bizottság (MTA PAB)
CY  - Pécs
SN  - 9789637068140
PY  - 2022
SP  - 33
EP  - 33
PG  - 1
UR  - https://m2.mtmt.hu/api/publication/33560789
ID  - 33560789
AB  - The eastern coast of Sicily is prone to changes due to human activities, sea-level changes, marine
natural hazards, fluctuations in sediment supply, and uplift. This phenomenon will impact the
resilience of infrastructure and settlements in the area. Therefore, this study aims to analyze the
coastline changes of eastern Sicily over the last 50 decades with a case study of the Catania to
Syracuse provinces. The method applied in this study is the analysis of Landsat image from 1972 to
2021, which then calculates the statistical parameters of End Point Rate (EPR) and Linear Regression
Rate (LRR) using the Digital Shoreline Analysis System (DSAS) to obtain information on the average
of accretion and erosion rates. The study results demonstrate that the average accretion and
erosion rates on the eastern coast of Sicily are 1.39172 m/year and -0.85858 m/year. The highest
accretion and erosion rates reached 4.55 m/year and -8.99 m/year. This study concludes that the
eastern coast of Sicily changes towards the sea, or in other words, there is an expansion of the
coastal area.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Ortmann-né Ajkai, Adrienne
AU  - Morva, Tamás
AU  - Pirkhoffer, Ervin
AU  - Lóczy, Dénes
AU  - Halmai, Ákos
AU  - Németh, Gergő
AU  - Gyenizse, Péter
TI  - A GIS-based framework to determine spatially explicit priority categories for flood risk management intervention schemes
JF  - MORAVIAN GEOGRAPHICAL REPORTS
J2  - MORAV GEOGR REP
VL  - 30
PY  - 2022
IS  - 3
SP  - 211
EP  - 226
PG  - 16
SN  - 1210-8812
DO  - 10.2478/mgr-2022-0014
UR  - https://m2.mtmt.hu/api/publication/33155083
ID  - 33155083
N1  - Funding Agency and Grant Number: National Research, Development and Innovation Office, Hungary (NKFIH) [SNN 125727]; Slovenian Research Agency (ARRS) [N6-0070]; research program Geography of Slovenia (ARRS) [P6-0101]; New National Excellence Program of the Ministry for Innovation and Technology [UNKP-21-3-I]
            Funding text: The authors express their gratitude to three anonymous reviewers, whose thorough work and useful questions helped to improve the manuscript to a great extent. We are grateful to the financial support from the National Research, Development and Innovation Office, Hungary (NKFIH) within the framework of the Hungarian-Slovenian collaborative project "Possible ecological control of flood hazard in the hill regions of Hungary and Slovenia" (contract no SNN 125727) and within the framework of the program Excellence in Higher Education, Theme II.3 ("Innovation for sustainable life and environment"). The authors acknowledge that the study was performed in the frame of the project "Possible ecological control of flood hazard in the hilly regions of Hungary and Slovenia". The project was financially supported by the Slovenian Research Agency (ARRS, N6-0070) and the research program Geography of Slovenia (ARRS, P6-0101). Furthermore, we are grateful to the South-Transdanubian Water Management Directorate (Hungary) for data provision and support. GN was financially supported by UNKP-21-3-I. ("New National Excellence Program of the Ministry for Innovation and Technology").
AB  - The necessity of plural valuation of costs for flood risk management is widely acknowledged, but practical case studies are still scarce. We developed a GIS-based plural valuation framework to determine spatially explicit priority categories for flood risk management intervention schemes on the Drava River, Southern Hungary. A conventional economic evaluation, including land market prices and additional costs due to legal conservation restrictions, was complemented by ecological valuation of vulnerability. The inclusion of ecological vulnerability significantly changed the proposed priority areas for flood risk management interventions: in this case, softwood riparian forests face far less threat, together with other Natura 2000 habitats, in comparison to unprotected wetlands and grasslands. This valuation framework also highlights priority habitats and areas for joint conservation and water management projects, utilising the synergies between several EU Directives as the Birds Directive, Habitats Directive, Flood Directive, and Water Framework Directive. Our framework is adaptable for the other floodplains along major or medium-sized European rivers, assuming that specific local settings are considered.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Sarkadi, Noémi
AU  - Pirkhoffer, Ervin
AU  - Lóczy, Dénes
AU  - Balatonyi, László
AU  - Geresdi, István
AU  - Fábián, Szabolcs Ákos
AU  - Varga, Gábor
AU  - Balogh, Richárd
AU  - Gradwohl-Valkay, Alexandra Ilona
AU  - Halmai, Ákos
AU  - Czigány, Szabolcs
TI  - Generation of a flood susceptibility map of evenly weighted conditioning factors for Hungary
JF  - GEOGRAPHICA PANNONICA
J2  - GEOGRAPHICA PANNONICA
VL  - 26
PY  - 2022
IS  - 3
SP  - 200
EP  - 214
PG  - 15
SN  - 0354-8724
DO  - 10.5937/gp26-38969
UR  - https://m2.mtmt.hu/api/publication/33202808
ID  - 33202808
N1  - Institute of Geography and Earth Sciences, University of Pécs, Ifjúság u. 6, Pécs, 7624, Hungary            
            General Directorate of Water Management, Márvány utca 1/D, Budapest, 1012, Hungary            
            Cited By :1            
            Export Date: 9 October 2023            
            Correspondence Address: Pirkhoffer, E.; Institute of Geography and Earth Sciences, Ifjúság u. 6, Hungary; email: pirkhoff@gamma.ttk.pte.hu
AB  - Over the past decades, in the mountainous, hilly and/or urban areas of Hungary several high-intensity storms were followed by severe flash flooding and other hydrologic consequences. The overall aim of this paper was to upgrade the national flash flood susceptibility map of Hungary first published by Czigány et al. (2011). One elementary watershed level (FFSIws) and three settlement level flash flood susceptibility maps (FFSIs) were constructed using 13 environmental factors that influence flash flood generation. FFSI maps were verified by 2,677 documented flash flood events. In total, 5,458 watersheds were delineated. Almost exactly 10% of all delineated watersheds were included into the category of extreme susceptibility. While the number of the mean-based FFSIs demonstrated a normal quasi-Gaussian distribution with very low percentages in the quintile of low and extreme categories, the maximum-based FFSIs overemphasized the proportion of settlements of high and extreme susceptibility. These two categories combined accounted for more than 50% of all settlements. The highest accuracy at 59.02% for class 5 (highest susceptibility) was found for the majority based FFSIs. The current map has been improved compared to the former one in terms of (i) a higher number of conditional factors considered, (ii) higher resolution, (iii) being settlement-based and (iv) a higher number of events used for verification.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Szabó, Péter
AU  - Kovács, János
AU  - Kocsis, L
AU  - Vennemann, T
AU  - Domingo, L
AU  - Újvári, Gábor
AU  - Halmai, Ákos
AU  - Pirkhoffer, Ervin
AU  - Codrea, V
TI  - Pliocene - Early Pleistocene continental climate and vegetation in Europe based on stable isotope compositions of mammal tooth enamel
JF  - QUATERNARY SCIENCE REVIEWS
J2  - QUATERN SCI REV
VL  - 288
PY  - 2022
PG  - 19
SN  - 0277-3791
DO  - 10.1016/j.quascirev.2022.107572
UR  - https://m2.mtmt.hu/api/publication/32861079
ID  - 32861079
AB  - There is an increasing need for paleoclimate records from continental settings to better understand the climatic changes during critical periods such as the Pliocene and Early Pleistocene. Present data indicates a transition from a warmer than present-day climate to a substantially different cooler climate. This study reviews the oxygen and carbon isotope compositions of mammalian tooth enamel for the Pliocene
and Early Pleistocene of South and Central Europe to reconstruct the spatial distribution and temporal changes of the vegetation and oxygen isotope composition of precipitation (d18Oppt). In addition to a literature review, this study adds new stable isotope measurements for this period. All d13C values indicate C3 ecosystems and reflect major changes in the water use efficiency and/or in the prevailing
humidity. The reconstructed major floral types range from woodland to woodland ‒ mesic grassland in all of the investigated regions. The carbon isotope compositions of fossil mammal teeth demonstrate that the spatial distribution of vegetation was broadly similar to those of the present-day for the Early/Late Pliocene e Early Pleistocene, with the most “closed” vegetation in Central and Northern Italy, while open mesic grassland vegetation covers can be reconstructed for the Iberian Peninsula, Massif Central region (Central France) and the Carpathian Basin. The calculated d18Oppt values give a negative temporal shift of about 1e1.5‰ from the Early Pliocene to Late Pliocene e Early Pleistocene in three regions (Iberian Peninsula, Central Italy, Carpathian Basin), potentially representing a 1.5e3.0 C decrease in mean annual
temperatures (MAT) over time. In the Massif Central region and the Carpathian Basin, the d18Oppt values are almost the same for the Late Pliocene and Early Pleistocene, while in Northern Italy the values decreased over that period. The d18Oppt values are in the range of present-day d18Oppt values over the Early Pliocene and somewhat lower than present-day values for the Late Pliocene - Early Pleistocene in
most of the regions. Because most other proxies indicate warmer than present-day climate for the Early Pliocene and similar to present-day climate for the Early Pleistocene, the d18Oppt values are generally lower than expected, which can be partially explained by local effects.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Víg, Balázs
AU  - Fábián, Szabolcs Ákos
AU  - Czigány, Szabolcs
AU  - Pirkhoffer, Ervin
AU  - Halmai, Ákos
AU  - Kovács, István Péter
AU  - Varga, Gábor
AU  - Dezső, József
AU  - Nagy, Gábor
AU  - Lóczy, Dénes
TI  - Morphometric analysis of low mountains for mapping flash flood susceptibility in headwaters
JF  - NATURAL HAZARDS
J2  - NAT HAZARDS
VL  - 114
PY  - 2022
IS  - 3
SP  - 3235
EP  - 3554
PG  - 20
SN  - 0921-030X
DO  - 10.1007/s11069-022-05513-6
UR  - https://m2.mtmt.hu/api/publication/33042768
ID  - 33042768
N1  - Doctoral School of Earth Sciences, Institute of Geography and Earth Sciences, University of Pécs, Pécs, Hungary            
            Institute of Geography and Earth Sciences, University of Pécs, Pécs, Hungary            
            South-Transdanubian Water Management Directorate, Pécs, Hungary            
            Cited By :1            
            Export Date: 9 October 2023            
            Correspondence Address: Víg, B.; Doctoral School of Earth Sciences, Hungary; email: vbalazs90@hotmail.com            
            Funding details: GINOP-2.3.2–15-2016–00055            
            Funding details: Emberi Eroforrások Minisztériuma, EMMI, 20765            
            Funding text 1: We sincerely thank the Editors and Reviewers for their useful and comprehensive comments on the manuscript, and we greatly appreciate their time and effort spent in this paper. The authors are also grateful to the Mecsek Forestry Co. Ltd (Mecsekerdő Zrt.) and the South-Transdanubian Water Management Directorate (Dél-Dunántúli Vízügyi Igazgatóság, DDVIZIG) for providing data for the current research.            
            Funding text 2: Open access funding provided by University of Pécs. This research was funded by the Higher Education Institutional Excellence Program of Ministry of Human Capacities (Hungary), Grant Number “20765–3/2018/FEKUTSTRAT” at the University of Pécs and the Hungarian National Office for Research and Innovation (project GINOP-2.3.2–15-2016–00055).
AB  - Morphometric indices from high-resolution DEMs can contribute to the estimation of flash flood susceptibility in mountainous areas. We have screened 25 morphometric indices commonly used in literature, and based on a correlation matrix, selected those which showed the strongest relationship with flash flood generation: area ( A ), drainage texture (Rt), drainage density (Dd), elongation ratio (Re), form factor (Ff), lemniscate method ( k ), Gravelius coefficient (GC), forested area (Fa) and relief ratio (Rr). Among them Dd, Rt and Rr had a direct impact on flash flood generation, while A , Re, Fa, Ff, k and GC are in inverse relationship with the intensity of flash floods. Our summary map shows the prioritization of the watersheds on a scale of 0 to 9. The flash flood susceptibility ranking was empirically verified using hydrological data (20-year water regime obtained from 14 official stream gauges). Our conclusions only partially agree with former observations which may be explained by the particular lithology and morphology of the Mecsek Mountains. Since the lower sections of the watersheds are urbanized, for optimal watershed management more detailed GIS analyses of anthropogenic controls on flash flood hazard are needed in the future.
LA  - English
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Gradwohl-Valkay, Alexandra Ilona
AU  - Ficsor, Johanna
AU  - Halmai, Ákos
AU  - Nagyváradi, László
AU  - Kiss, Kinga
AU  - Czigány, Szabolcs
AU  - Pirkhoffer, Ervin
AU  - Liptay, Zoltán Árpád
AU  - Balogh, Richárd
ED  - Abriha-Molnár, Vanda Éva
TI  - A Dráva morfológiai változásainak térinformatikai vizsgálata
T2  - Az elmélet és a gyakorlat találkozása a térinformatikában XII.: Theory meets practice in GIS
PB  - Debreceni Egyetemi Kiadó
CY  - Debrecen
SN  - 9789633189771
PY  - 2021
SP  - 99
EP  - 104
PG  - 5
UR  - https://m2.mtmt.hu/api/publication/32492431
ID  - 32492431
AB  - Implementing nature conservation and landscape management requires the up-to-date
knowledge of the changes in river morphometry and bedload dynamics. Hence, we aimed at comparing
mapping the positions of the 2013 and the 2019 centrelines and the actual bathymetry of the Drava River
between its confluence with the Mura River (rkm 2018) and the community of Drávaszabolcs (rkm 75).
We found significant differences in the positions of the two centrelines upstream of the town of Barcs.
Downstream of Barcs, however, the two centrelines almost entirely coincide. The adverse behaviour of
the Drava in its Hungarian reach is explained by the anthropogenic influence in the downstream reach
and the more natural character of the river upstream of Barcs.
LA  - Hungarian
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Halmai, Ákos
AU  - Pirkhoffer, Ervin
AU  - Varjas, János
ED  - Nagy, Ádám
ED  - Pirkhoffer, Ervin
TI  - Kiképzésem története és egyéb tudásmorzsák
T2  - A hét kristály rejtélye - galaktikus geográfia
PB  - Pécsi Tudományegyetem Természettudományi Kar (PTE TTK)
CY  - Pécs
SN  - 9789634296492
PY  - 2021
SP  - 28
EP  - 39
PG  - 12
UR  - https://m2.mtmt.hu/api/publication/32098478
ID  - 32098478
LA  - Hungarian
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Lovász, Virág
AU  - Karsa, Róbert
AU  - Halász, Amadé
AU  - Halmai, Ákos
ED  - Abriha-Molnár, Vanda Éva
TI  - Deep Learning megoldások alkalmazhatóságának vizsgálata földtani környezetben, a Bodai Agyagkő Formáció tektonikai töréseinek példáján
T2  - Az elmélet és a gyakorlat találkozása a térinformatikában XII.: Theory meets practice in GIS
PB  - Debreceni Egyetemi Kiadó
CY  - Debrecen
SN  - 9789633189771
PY  - 2021
SP  - 175
EP  - 180
PG  - 5
UR  - https://m2.mtmt.hu/api/publication/32492797
ID  - 32492797
AB  - In Hungary, the planned high level radioactive waste repository is scheduled to be implemented around 2050. Country wide screening found the Permian Boda Claystone Formation (BCF) as the most suitable host rock (Kovács et al. 1999; Konrád – Hámos 2006). Ongoing researches aim to find the potential locations that can be considered safe for storage purposes (RHK 2019). Automated fracture detection could majorly speed up the work of geologist experts. Deep learning (DL) is suitable for our task given its distinguishing features: producing bias-free logic by the data itself, and being able to find nondescript correlations through its multilayer network (Paluszek – Thomas 2020). The construction of the most efficient DL process regarding the fractures expected to be devised thoroughly. This paper compares the performance of Faster R-CNN with different backbone architectures, to establish reliable foundation for this task.
LA  - Hungarian
DB  - MTMT
ER  - 

TY  - CONF
AU  - Lovász, Virág
AU  - Halász, Amadé
AU  - Nagyváradi, László
AU  - Halmai, Ákos
ED  - Tésits, Róbert
ED  - Lempek, Melissza Zita
ED  - Alpek, Balázs Levente
TI  - A permi Boda Agyagkő Formáció (BAF) vizsgálata Deep Learning alapú eszközökkel
T2  - Modern Geográfia - 15
PB  - Publikon Kiadó
C1  - Pécs
SN  - 9786155457937
PY  - 2021
SP  - 18
EP  - 18
PG  - 1
UR  - https://m2.mtmt.hu/api/publication/32468780
ID  - 32468780
LA  - Hungarian
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Pirkhoffer, Ervin
AU  - Halmai, Ákos
AU  - Ficsor, Johanna
AU  - Gradwohl-Valkay, Alexandra Ilona
AU  - Lóczy, Dénes
AU  - Nagy, Ádám
AU  - Liptay, Zoltán Árpád
AU  - Czigány, Szabolcs
TI  - Bedload entrainment dynamics in a partially channelized river with mixed bedload: A case study of the Drava River, Hungary
JF  - RIVER RESEARCH AND APPLICATIONS
J2  - RIVER RES APPL
VL  - 2021
PY  - 2021
IS  - 37
SP  - 699
EP  - 711
PG  - 13
SN  - 1535-1459
DO  - 10.1002/rra.3794
UR  - https://m2.mtmt.hu/api/publication/31940975
ID  - 31940975
N1  - Funding Agency and Grant Number: Higher Education Institutional Excellence Program of Ministry of Human Capacities (Hungary) [20765-3/2018/FEKUTSTRAT]; University of Pecs; Hungarian Scientific Research Fund [GINOP2.3.2-15-2016-00055]
            Funding text: Higher Education Institutional Excellence Program of Ministry of Human Capacities (Hungary), Grant/Award Number: 20765-3/2018/FEKUTSTRAT; University of Pecs and the Hungarian Scientific Research Fund, Grant/Award Number: GINOP2.3.2-15-2016-00055
AB  - The morphodynamics of alluvial rivers is controlled by the mobilization of bed material. However, the details of mobilization of mixed-texture bed materials at low flows, increasingly common due to climate change, are still unclear. The 161-km-long Hungarian alluvial reach of the Drava River, downstream of sections where flow characteristics have been heavily modified by human interference, was investigated in 2019. A monitoring campaign at cross-sections, on average 5.55 km apart, was launched to study channel morphology, bedload entrainment dynamics with regard to texture. For the survey, a sonar, an ADCP and a Helley–Smith bedload sampler mounted on a double-hull vessel was used. Our research pointed out an abrupt fining between river kms (hereafter: rkm) 175 and 170 (distance from the mouth), probably due to reduced armouring. The d60 fraction was found to be finer than in 2003 and 2012 for the upstream stations of Botovo and Bélavár, and showed a good correspondence with the records of the Barcs and Drávaszabolcs stations. Temporal fining and higher entrainment rate are due to (a) changing climate of the catchment, that is, diminishing flow between the monitoring dates (2003, 2012 and 2019); (b) reduced armouring, (c) variability of cross-sectional position of sampling points and (d) the different mesh size of the bedload samplers employed. Calculations of shear velocity, Reynolds and Shields numbers indicate more dynamic sediment motion than observed by previous studies. Our reach-scale results may be relevant for the alluvial sections of other alpine and subalpine, partially channelized rivers of similar size, flow dynamics and mixed bedload.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Słowik, Marcin
AU  - Kiss, Kinga
AU  - Czigány, Szabolcs
AU  - Gradwohl-Valkay, Alexandra Ilona
AU  - Dezső, József
AU  - Halmai, Ákos
AU  - Marciniak, Adam
AU  - Tritt, Remigiusz
AU  - Pirkhoffer, Ervin
TI  - The influence of changes in flow regime caused by dam closure on channel planform evolution: insights from flume experiments
JF  - ENVIRONMENTAL EARTH SCIENCES
J2  - ENVIRON EARTH SCI
VL  - 80
PY  - 2021
IS  - 4
PG  - 18
SN  - 1866-6280
DO  - 10.1007/s12665-021-09437-5
UR  - https://m2.mtmt.hu/api/publication/31871037
ID  - 31871037
LA  - English
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Ficsor, Johanna
AU  - Halmai, Ákos
AU  - Nagyváradi, László
AU  - Kiss, Kinga
AU  - Czigány, Szabolcs
AU  - Pirkhoffer, Ervin
AU  - Liptay, Zoltán Árpád
AU  - Balogh, Richárd
AU  - Gradwohl-Valkay, Alexandra Ilona
ED  - Abriha-Molnár, Vanda Éva
TI  - A Dráva hordalékviszonyainak térinformatikai vizsgálata
T2  - Az elmélet és a gyakorlat találkozása a térinformatikában XI.: Theory meets practice in GIS
PB  - Debreceni Egyetemi Kiadó
CY  - Debrecen
SN  - 9789633188866
PY  - 2020
SP  - 85
EP  - 91
PG  - 6
UR  - https://m2.mtmt.hu/api/publication/32492811
ID  - 32492811
N1  - https://giskonferencia.unideb.hu/arch/GIS_Konf_kotet_2020.pdf
AB  - In our research we made a unique survey of the Hungarian reach of the Drava River, from 236 + 000 river kilometers, from the Mura mouth to the 74 + 000 river kilometers below Drávaszabolcs, for the better understanding of bedload transport using a sonar and flow measurements with ADCP and sediment sampling were carried out at 10 km intervals with van Dorn and Helley-Smith sampler. The long-term goals of nature conservation and landscape management necessitate this kind of unique research of the river and the knowledge of possible changes in the river bedload.
LA  - Hungarian
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Gyenizse, Péter
AU  - Morva, Tamás
AU  - Ortmann-né Ajkai, Adrienne
AU  - Lóczy, Dénes
AU  - Halmai, Ákos
AU  - Pirkhoffer, Ervin
ED  - Abriha-Molnár, Vanda Éva
TI  - Az Alsó-Dráva-ártér felszínborításának vizsgálata távérzékelési és geoinformatikai módszerekkel
T2  - Az elmélet és a gyakorlat találkozása a térinformatikában XI.: Theory meets practice in GIS
PB  - Debreceni Egyetemi Kiadó
CY  - Debrecen
SN  - 9789633188866
PY  - 2020
SP  - 101
EP  - 107
PG  - 7
UR  - https://m2.mtmt.hu/api/publication/31848404
ID  - 31848404
LA  - Hungarian
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Halmai, Ákos
AU  - Gradwohl-Valkay, Alexandra Ilona
AU  - Czigány, Szabolcs
AU  - Ficsor, Johanna
AU  - Liptay, Zoltán Árpád
AU  - Kiss, Kinga
AU  - Lóczy, Dénes
AU  - Pirkhoffer, Ervin
TI  - Applicability of a Recreational-Grade Interferometric Sonar for the Bathymetric Survey and Monitoring of the Drava River
JF  - ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
J2  - ISPRS INT J GEO-INFORMATION
VL  - 9
PY  - 2020
IS  - 3
SP  - 149
PG  - 21
SN  - 2220-9964
DO  - 10.3390/ijgi9030149
UR  - https://m2.mtmt.hu/api/publication/31208678
ID  - 31208678
AB  - Sonar survey of shallow water bodies has challenged scientists for a long time. Although these water courses are small, still they have an increasing ecological, touristic and economical role. As maritime sonars are non-ideal tools for shallow waters, the bathymetric survey of these rivers has been taken with cross-sectional methods. Due to recent developments, interferometric surveying technology have also burst into the market of recreational-grade fish-finders. The objective of the current study was the development of a novel, complex and integrated surveying technique which is affordable, robust and applicable even at low water levels. A recreational-grade sonar system was assembled and mounted on a double-hull vessel and connected with a geodetic Global Navigation Satellite System (GNSS) device. We have developed a novel software which enables the bridging between a closed sonar file format and the commonly used Geographic Information System (GIS) datasets. As a result, the several month-long conventional bathymetric survey of the 146 km-long reach of the Drava River was reduced to 20 days and provided channel bathymetry of many orders of magnitude higher than the classical methods. Additionally, a large number of spatial derivatives were generated which enables the analysis of channel morphology, textural variation of channel sediments and the accurate delineation of navigational routes.
LA  - English
DB  - MTMT
ER  - 

TY  - CHAP
AU  - Liptay, Zoltán Árpád
AU  - Halmai, Ákos
AU  - Pirkhoffer, Ervin
AU  - Czigány, Szabolcs
AU  - Gradwohl-Valkay, Alexandra Ilona
AU  - Ficsor, Johanna
ED  - Breugem, W.A.
ED  - Frederickx, L
ED  - Koutrouveli, T
ED  - Kulkarni, R
ED  - Chu, K
ED  - Decrop, B
TI  - Comprehensive morphodynamical analysis of the Drava River
T2  - Online proceedings of the papers submitted to the 2020 TELEMAC-MASCARET User Conference
PB  - International Marine & Dredging Consultants
CY  - Antwerpen
SN  - 9789464207194
PY  - 2020
SP  - 53
EP  - 60
PG  - 8
UR  - https://m2.mtmt.hu/api/publication/32252718
ID  - 32252718
LA  - English
DB  - MTMT
ER  -