@{MTMT:34571802,
	title = {Example code for "Paul Bourke, 1998: Determining whether or not a polygon (2D) has its vertices ordered clockwise or counter-clockwise".},
	url = {https://m2.mtmt.hu/api/publication/34571802},
	author = {Halmai, Ákos},
	unique-id = {34571802},
	abstract = {# 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},
	year = {2023},
	orcid-numbers = {Halmai, Ákos/0000-0001-5722-8119}
}

@article{MTMT:34034637,
	title = {Shoreline change dynamics along the Augusta coast, eastern Sicily, South Italy},
	url = {https://m2.mtmt.hu/api/publication/34034637},
	author = {Laksono, Fx Anjar Tri and Borzi, Laura and Distefano, Salvatore and Czirok, Lili and Halmai, Ákos and Di Stefano, Agata and Kovács, János},
	doi = {10.1002/esp.5644},
	journal-iso = {EARTH SURF PROCESS LANDF},
	journal = {EARTH SURFACE PROCESSES AND LANDFORMS},
	volume = {48},
	unique-id = {34034637},
	issn = {0197-9337},
	year = {2023},
	eissn = {1096-9837},
	pages = {1-12},
	orcid-numbers = {Laksono, Fx Anjar Tri/0000-0002-6061-6136; Halmai, Ákos/0000-0001-5722-8119; Kovács, János/0000-0001-7742-5515}
}

@article{MTMT:33733477,
	title = {Application of a CNN to the Boda Claystone Formation for high-level radioactive waste disposal},
	url = {https://m2.mtmt.hu/api/publication/33733477},
	author = {Lovász, Virág and Halász, Amadé and Molnár, Péter and Karsa, Róbert and Halmai, Ákos},
	doi = {10.1038/s41598-023-31564-1},
	journal-iso = {SCI REP},
	journal = {SCIENTIFIC REPORTS},
	volume = {13},
	unique-id = {33733477},
	issn = {2045-2322},
	abstract = {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.},
	keywords = {Convolutional Neural Networks (CNN); Boda Claystone},
	year = {2023},
	eissn = {2045-2322},
	orcid-numbers = {Halász, Amadé/0000-0003-4582-8883; Karsa, Róbert/0000-0003-0502-1508; Halmai, Ákos/0000-0001-5722-8119}
}

@article{MTMT:33568387,
	title = {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},
	url = {https://m2.mtmt.hu/api/publication/33568387},
	author = {Gyenizse, Péter and Soltész, Emese and Lóczy, Dénes and Kovács, János and Nagyváradi, László and Elekes, Tibor and Gyenizse-Nagy, Sára and Németh, Gergő and Halmai, Ákos},
	doi = {10.5937/gp26-39526},
	journal-iso = {GEOGRAPHICA PANNONICA},
	journal = {GEOGRAPHICA PANNONICA},
	volume = {26},
	unique-id = {33568387},
	issn = {0354-8724},
	abstract = {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.},
	year = {2022},
	eissn = {1820-7138},
	pages = {334-344},
	orcid-numbers = {Gyenizse, Péter/0000-0002-8175-9734; Lóczy, Dénes/0000-0002-2542-6775; Kovács, János/0000-0001-7742-5515; Németh, Gergő/0000-0001-7833-4017; Halmai, Ákos/0000-0001-5722-8119}
}

@{MTMT:33741721,
	title = {SL3Reader},
	url = {https://m2.mtmt.hu/api/publication/33741721},
	author = {Halmai, Ákos},
	unique-id = {33741721},
	abstract = {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},
	keywords = {Hidrologia; Szonár; mélységmérés; domborzatmodell},
	year = {2022},
	orcid-numbers = {Halmai, Ákos/0000-0001-5722-8119}
}

@{MTMT:33560789,
	title = {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},
	url = {https://m2.mtmt.hu/api/publication/33560789},
	author = {Laksono, Fx Anjar Tri and Czirok, Lili and Halmai, Ákos and Kovács, János},
	booktitle = {GeoMATES '22 International Congress on Geomathematics in Earth- and Environmental Sciences},
	unique-id = {33560789},
	abstract = {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.},
	keywords = {erosion; ACCRETION; Sicily; COASTLINE CHANGE},
	year = {2022},
	pages = {33-33},
	orcid-numbers = {Laksono, Fx Anjar Tri/0000-0002-6061-6136; Halmai, Ákos/0000-0001-5722-8119; Kovács, János/0000-0001-7742-5515}
}

@article{MTMT:33155083,
	title = {A GIS-based framework to determine spatially explicit priority categories for flood risk management intervention schemes},
	url = {https://m2.mtmt.hu/api/publication/33155083},
	author = {Ortmann-né Ajkai, Adrienne and Morva, Tamás and Pirkhoffer, Ervin and Lóczy, Dénes and Halmai, Ákos and Németh, Gergő and Gyenizse, Péter},
	doi = {10.2478/mgr-2022-0014},
	journal-iso = {MORAV GEOGR REP},
	journal = {MORAVIAN GEOGRAPHICAL REPORTS},
	volume = {30},
	unique-id = {33155083},
	issn = {1210-8812},
	abstract = {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.},
	keywords = {Hungary; decision support system; Water Framework Directive; ECOLOGICAL VULNERABILITY; riparian forests; Inland wetlands},
	year = {2022},
	eissn = {2199-6202},
	pages = {211-226},
	orcid-numbers = {Lóczy, Dénes/0000-0002-2542-6775; Halmai, Ákos/0000-0001-5722-8119; Németh, Gergő/0000-0001-7833-4017; Gyenizse, Péter/0000-0002-8175-9734}
}

@article{MTMT:33202808,
	title = {Generation of a flood susceptibility map of evenly weighted conditioning factors for Hungary},
	url = {https://m2.mtmt.hu/api/publication/33202808},
	author = {Sarkadi, Noémi and Pirkhoffer, Ervin and Lóczy, Dénes and Balatonyi, László and Geresdi, István and Fábián, Szabolcs Ákos and Varga, Gábor and Balogh, Richárd and Gradwohl-Valkay, Alexandra Ilona and Halmai, Ákos and Czigány, Szabolcs},
	doi = {10.5937/gp26-38969},
	journal-iso = {GEOGRAPHICA PANNONICA},
	journal = {GEOGRAPHICA PANNONICA},
	volume = {26},
	unique-id = {33202808},
	issn = {0354-8724},
	abstract = {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.},
	year = {2022},
	eissn = {1820-7138},
	pages = {200-214},
	orcid-numbers = {Sarkadi, Noémi/0000-0002-2370-8621; Pirkhoffer, Ervin/0000-0003-2917-3290; Lóczy, Dénes/0000-0002-2542-6775; Balatonyi, László/0000-0001-5130-730X; Geresdi, István/0000-0002-3160-7900; Fábián, Szabolcs Ákos/0000-0001-9127-2113; Halmai, Ákos/0000-0001-5722-8119; Czigány, Szabolcs/0000-0002-9158-3162}
}

@article{MTMT:32861079,
	title = {Pliocene - Early Pleistocene continental climate and vegetation in Europe based on stable isotope compositions of mammal tooth enamel},
	url = {https://m2.mtmt.hu/api/publication/32861079},
	author = {Szabó, Péter and Kovács, János and Kocsis, L and Vennemann, T and Domingo, L and Újvári, Gábor and Halmai, Ákos and Pirkhoffer, Ervin and Codrea, V},
	doi = {10.1016/j.quascirev.2022.107572},
	journal-iso = {QUATERN SCI REV},
	journal = {QUATERNARY SCIENCE REVIEWS},
	volume = {288},
	unique-id = {32861079},
	issn = {0277-3791},
	abstract = {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.},
	keywords = {Central Europe; paleoclimate; South Europe; vertebrate fossils},
	year = {2022},
	eissn = {1873-457X},
	orcid-numbers = {Szabó, Péter/0000-0003-0827-3583; Kovács, János/0000-0001-7742-5515; Kocsis, L/0000-0003-4613-1850; Domingo, L/0000-0002-9062-0881; Újvári, Gábor/0000-0002-2816-6155; Halmai, Ákos/0000-0001-5722-8119}
}

@article{MTMT:33042768,
	title = {Morphometric analysis of low mountains for mapping flash flood susceptibility in headwaters},
	url = {https://m2.mtmt.hu/api/publication/33042768},
	author = {Víg, Balázs and Fábián, Szabolcs Ákos and Czigány, Szabolcs and Pirkhoffer, Ervin and Halmai, Ákos and Kovács, István Péter and Varga, Gábor and Dezső, József and Nagy, Gábor and Lóczy, Dénes},
	doi = {10.1007/s11069-022-05513-6},
	journal-iso = {NAT HAZARDS},
	journal = {NATURAL HAZARDS},
	volume = {114},
	unique-id = {33042768},
	issn = {0921-030X},
	abstract = {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.},
	keywords = {Runoff; Mecsek Mountains; compactness; Morphometric indices; Flash flood susceptibility; Watershed prioritization},
	year = {2022},
	eissn = {1573-0840},
	pages = {3235-3554},
	orcid-numbers = {Fábián, Szabolcs Ákos/0000-0001-9127-2113; Czigány, Szabolcs/0000-0002-9158-3162; Pirkhoffer, Ervin/0000-0003-2917-3290; Halmai, Ákos/0000-0001-5722-8119; Kovács, István Péter/0000-0002-0270-4365; Lóczy, Dénes/0000-0002-2542-6775}
}

@inproceedings{MTMT:32492431,
	title = {A Dráva morfológiai változásainak térinformatikai vizsgálata},
	url = {https://m2.mtmt.hu/api/publication/32492431},
	author = {Gradwohl-Valkay, Alexandra Ilona and Ficsor, Johanna and Halmai, Ákos and Nagyváradi, László and Kiss, Kinga and Czigány, Szabolcs and Pirkhoffer, Ervin and Liptay, Zoltán Árpád and Balogh, Richárd},
	booktitle = {Az elmélet és a gyakorlat találkozása a térinformatikában XII.: Theory meets practice in GIS},
	unique-id = {32492431},
	abstract = {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.},
	year = {2021},
	pages = {99-104},
	orcid-numbers = {Ficsor, Johanna/0000-0001-9439-516X; Halmai, Ákos/0000-0001-5722-8119; Czigány, Szabolcs/0000-0002-9158-3162; Liptay, Zoltán Árpád/0000-0001-8984-9366}
}

@{MTMT:32098478,
	title = {Kiképzésem története és egyéb tudásmorzsák},
	url = {https://m2.mtmt.hu/api/publication/32098478},
	author = {Halmai, Ákos and Pirkhoffer, Ervin and Varjas, János},
	booktitle = {A hét kristály rejtélye - galaktikus geográfia},
	unique-id = {32098478},
	year = {2021},
	pages = {28-39},
	orcid-numbers = {Halmai, Ákos/0000-0001-5722-8119}
}

@inproceedings{MTMT:32492797,
	title = {Deep Learning megoldások alkalmazhatóságának vizsgálata földtani környezetben, a Bodai Agyagkő Formáció tektonikai töréseinek példáján},
	url = {https://m2.mtmt.hu/api/publication/32492797},
	author = {Lovász, Virág and Karsa, Róbert and Halász, Amadé and Halmai, Ákos},
	booktitle = {Az elmélet és a gyakorlat találkozása a térinformatikában XII.: Theory meets practice in GIS},
	unique-id = {32492797},
	abstract = {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.},
	year = {2021},
	pages = {175-180},
	orcid-numbers = {Halász, Amadé/0000-0003-4582-8883; Halmai, Ákos/0000-0001-5722-8119}
}

@CONFERENCE{MTMT:32468780,
	title = {A permi Boda Agyagkő Formáció (BAF) vizsgálata Deep Learning alapú eszközökkel},
	url = {https://m2.mtmt.hu/api/publication/32468780},
	author = {Lovász, Virág and Halász, Amadé and Nagyváradi, László and Halmai, Ákos},
	booktitle = {Modern Geográfia - 15},
	unique-id = {32468780},
	year = {2021},
	pages = {18-18},
	orcid-numbers = {Halász, Amadé/0000-0003-4582-8883; Halmai, Ákos/0000-0001-5722-8119}
}

@article{MTMT:31940975,
	title = {Bedload entrainment dynamics in a partially channelized river with mixed bedload: A case study of the Drava River, Hungary},
	url = {https://m2.mtmt.hu/api/publication/31940975},
	author = {Pirkhoffer, Ervin and Halmai, Ákos and Ficsor, Johanna and Gradwohl-Valkay, Alexandra Ilona and Lóczy, Dénes and Nagy, Ádám and Liptay, Zoltán Árpád and Czigány, Szabolcs},
	doi = {10.1002/rra.3794},
	journal-iso = {RIVER RES APPL},
	journal = {RIVER RESEARCH AND APPLICATIONS},
	volume = {2021},
	unique-id = {31940975},
	issn = {1535-1459},
	abstract = {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.},
	keywords = {Hydromorphology; Drava River; armouring; bedload entrainment; bedload texture; regulated river},
	year = {2021},
	eissn = {1535-1467},
	pages = {699-711},
	orcid-numbers = {Pirkhoffer, Ervin/0000-0003-2917-3290; Halmai, Ákos/0000-0001-5722-8119; Ficsor, Johanna/0000-0001-9439-516X; Lóczy, Dénes/0000-0002-2542-6775; Liptay, Zoltán Árpád/0000-0001-8984-9366; Czigány, Szabolcs/0000-0002-9158-3162}
}

@article{MTMT:31871037,
	title = {The influence of changes in flow regime caused by dam closure on channel planform evolution: insights from flume experiments},
	url = {https://m2.mtmt.hu/api/publication/31871037},
	author = {Słowik, Marcin and Kiss, Kinga and Czigány, Szabolcs and Gradwohl-Valkay, Alexandra Ilona and Dezső, József and Halmai, Ákos and Marciniak, Adam and Tritt, Remigiusz and Pirkhoffer, Ervin},
	doi = {10.1007/s12665-021-09437-5},
	journal-iso = {ENVIRON EARTH SCI},
	journal = {ENVIRONMENTAL EARTH SCIENCES},
	volume = {80},
	unique-id = {31871037},
	issn = {1866-6280},
	year = {2021},
	eissn = {1866-6299},
	orcid-numbers = {Kiss, Kinga/0000-0001-6011-8690; Czigány, Szabolcs/0000-0002-9158-3162; Halmai, Ákos/0000-0001-5722-8119; Pirkhoffer, Ervin/0000-0003-2917-3290}
}

@inproceedings{MTMT:32492811,
	title = {A Dráva hordalékviszonyainak térinformatikai vizsgálata},
	url = {https://m2.mtmt.hu/api/publication/32492811},
	author = {Ficsor, Johanna and Halmai, Ákos and Nagyváradi, László and Kiss, Kinga and Czigány, Szabolcs and Pirkhoffer, Ervin and Liptay, Zoltán Árpád and Balogh, Richárd and Gradwohl-Valkay, Alexandra Ilona},
	booktitle = {Az elmélet és a gyakorlat találkozása a térinformatikában XI.: Theory meets practice in GIS},
	unique-id = {32492811},
	abstract = {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.},
	year = {2020},
	pages = {85-91},
	orcid-numbers = {Ficsor, Johanna/0000-0001-9439-516X; Halmai, Ákos/0000-0001-5722-8119; Czigány, Szabolcs/0000-0002-9158-3162; Liptay, Zoltán Árpád/0000-0001-8984-9366}
}

@inproceedings{MTMT:31848404,
	title = {Az Alsó-Dráva-ártér felszínborításának vizsgálata távérzékelési és geoinformatikai módszerekkel},
	url = {https://m2.mtmt.hu/api/publication/31848404},
	author = {Gyenizse, Péter and Morva, Tamás and Ortmann-né Ajkai, Adrienne and Lóczy, Dénes and Halmai, Ákos and Pirkhoffer, Ervin},
	booktitle = {Az elmélet és a gyakorlat találkozása a térinformatikában XI.: Theory meets practice in GIS},
	unique-id = {31848404},
	year = {2020},
	pages = {101-107},
	orcid-numbers = {Gyenizse, Péter/0000-0002-8175-9734; Lóczy, Dénes/0000-0002-2542-6775; Halmai, Ákos/0000-0001-5722-8119}
}

@article{MTMT:31208678,
	title = {Applicability of a Recreational-Grade Interferometric Sonar for the Bathymetric Survey and Monitoring of the Drava River},
	url = {https://m2.mtmt.hu/api/publication/31208678},
	author = {Halmai, Ákos and Gradwohl-Valkay, Alexandra Ilona and Czigány, Szabolcs and Ficsor, Johanna and Liptay, Zoltán Árpád and Kiss, Kinga and Lóczy, Dénes and Pirkhoffer, Ervin},
	doi = {10.3390/ijgi9030149},
	journal-iso = {ISPRS INT J GEO-INFORMATION},
	journal = {ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION},
	volume = {9},
	unique-id = {31208678},
	abstract = {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.},
	keywords = {Interferometry; bathymetry; sonar measurements; Dráva basin; recreational fishing; active remote sensing},
	year = {2020},
	eissn = {2220-9964},
	pages = {149-170},
	orcid-numbers = {Halmai, Ákos/0000-0001-5722-8119; Czigány, Szabolcs/0000-0002-9158-3162; Ficsor, Johanna/0000-0001-9439-516X; Liptay, Zoltán Árpád/0000-0001-8984-9366; Lóczy, Dénes/0000-0002-2542-6775; Pirkhoffer, Ervin/0000-0003-2917-3290}
}

@inproceedings{MTMT:32252718,
	title = {Comprehensive morphodynamical analysis of the Drava River},
	url = {https://m2.mtmt.hu/api/publication/32252718},
	author = {Liptay, Zoltán Árpád and Halmai, Ákos and Pirkhoffer, Ervin and Czigány, Szabolcs and Gradwohl-Valkay, Alexandra Ilona and Ficsor, Johanna},
	booktitle = {Online proceedings of the papers submitted to the 2020 TELEMAC-MASCARET User Conference},
	unique-id = {32252718},
	year = {2020},
	pages = {53-60},
	orcid-numbers = {Liptay, Zoltán Árpád/0000-0001-8984-9366; Halmai, Ákos/0000-0001-5722-8119; Czigány, Szabolcs/0000-0002-9158-3162; Ficsor, Johanna/0000-0001-9439-516X}
}