TY - JOUR AU - Fehér, Eszter AU - Havasi-Tóth, Balázs AU - Ludmány, Balázs TI - Fully spherical 3D datasets on sedimentary particles: Fast measurement and evaluation JF - CENTRAL EUROPEAN GEOLOGY J2 - CENT EUR GEOL VL - 65 PY - 2022 IS - 2 SP - 111 EP - 121 PG - 11 SN - 1788-2281 DO - 10.1556/24.2022.00124 UR - https://m2.mtmt.hu/api/publication/33093510 ID - 33093510 AB - Recently it became increasingly evident that the statistical distributions of size and shape descriptors of sedimentary particles reveal crucial information on their evolution and may even carry the fingerprints of their provenance as fragments. However, to unlock this trove of information, measurement of traditional geophysical shape descriptors (mostly detectable on 2D projections) is not sufficient; fully spherical 3D imaging and mathematical algorithms suitable to extract new types of inherently 3D shape descriptors are necessary. Available 3D imaging technologies force users to choose either speed or full sphericity. Only partial morphological information can be extracted in the absence of the latter (e.g., LIDAR imaging). In the case of fully spherical imaging, speed was proved to be prohibitive for obtaining meaningful statistical samples, and inherently 3D shape descriptors were not extracted. Here we present a new method by complementing a commercial, portable 3D scanner with simple hardware to quickly obtain fully spherical 3D datasets from large collections of sedimentary particles. We also present software for the automated extraction of 3D shapes and automated measurement of inherently 3D-shape properties. This technique allows for examining large samples without the need for transportation or storage of the samples, and it may also facilitate the collaboration of geographically distant research groups. We validated our software on a large sample of pebbles by comparing previously hand-measured parameters with the results of automated shape analysis. We also tested our hardware and software tools on a large pebble sample in Kawakawa Bay, New Zealand. LA - English DB - MTMT ER - TY - JOUR AU - Sipos, András Árpád AU - Domokos, Gábor AU - Török, János TI - Particle size dynamics in abrading pebble populations JF - EARTH SURFACE DYNAMICS J2 - E SURF DYN VL - 9 PY - 2021 IS - 2 SP - 235 EP - 251 PG - 17 SN - 2196-6311 DO - 10.5194/esurf-9-235-2021 UR - https://m2.mtmt.hu/api/publication/31890542 ID - 31890542 AB - Abrasion of sedimentary particles in fluvial and eolian environments is widely associated with collisions encountered by the particle. Although the physics of abrasion is complex, purely geometric models recover the course of mass and shape evolution of individual particles in low- and middle-energy environments (in the absence of fragmentation) remarkably well. In this paper, we introduce the first model for the collision-driven collective mass evolution of sedimentary particles. The model utilizes results of the individual, geometric abrasion theory as a collision kernel; following techniques adopted in the statistical theory of coagulation and fragmentation, the corresponding Fokker–Planck equation is derived. Our model uncovers a startling fundamental feature of collective particle size dynamics: collisional abrasion may, depending on the energy level, either focus size distributions, thus enhancing the effects of size-selective transport, or it may act in the opposite direction by dispersing the distribution. LA - English DB - MTMT ER - TY - CHAP AU - Domokos, Gábor AU - Gibbons, Gary W. ED - Ambrus, Gergely ED - Bárány, Imre ED - Böröczky, Károly (Ifj.) ED - Fejes Tóth, Gábor ED - Pach, János TI - The Geometry of Abrasion T2 - New Trends in Intuitive Geometry PB - Springer Netherlands CY - New York, New York CY - Berlin CY - Heidelberg SN - 9783662574133 T3 - Bolyai Society Mathematical Studies, ISSN 1217-4696 ; 27. PY - 2018 SP - 125 EP - 153 PG - 29 DO - 10.1007/978-3-662-57413-3_6 UR - https://m2.mtmt.hu/api/publication/30359957 ID - 30359957 N1 - Cited By :1 Export Date: 22 June 2021 Correspondence Address: Domokos, G.; MTA-BME Morphodynamics Research Group and Dept. of Mechanics, Műegyetem rakpart 1-3, Hungary; email: domokos@iit.bme.hu Funding details: National Kidney Foundation of Illinois, NKFI Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFIH, 119245 Funding text 1: This research was supported by NKFI grant 119245. The comments from Dr Timea Szabó and from Prof. Fred Bloore are greatly appreciated. Funding text 2: Acknowledgements This research was supported by NKFI grant 119245. The comments from Dr Timea Szabó and from Prof. Fred Bloore are greatly appreciated. Cited By :2 Export Date: 8 September 2021 Correspondence Address: Domokos, G.; MTA-BME Morphodynamics Research Group and Dept. of Mechanics, Műegyetem rakpart 1-3, Hungary; email: domokos@iit.bme.hu Funding details: National Kidney Foundation of Illinois, NKFI Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFIH, 119245 Funding text 1: This research was supported by NKFI grant 119245. The comments from Dr Timea Szabó and from Prof. Fred Bloore are greatly appreciated. Funding text 2: Acknowledgements This research was supported by NKFI grant 119245. The comments from Dr Timea Szabó and from Prof. Fred Bloore are greatly appreciated. Cited By :2 Export Date: 9 September 2021 Correspondence Address: Domokos, G.; MTA-BME Morphodynamics Research Group and Dept. of Mechanics, Műegyetem rakpart 1-3, Hungary; email: domokos@iit.bme.hu Funding details: National Kidney Foundation of Illinois, NKFI Funding details: Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, NKFIH, 119245 Funding text 1: This research was supported by NKFI grant 119245. The comments from Dr Timea Szabó and from Prof. Fred Bloore are greatly appreciated. Funding text 2: Acknowledgements This research was supported by NKFI grant 119245. The comments from Dr Timea Szabó and from Prof. Fred Bloore are greatly appreciated. LA - English DB - MTMT ER - TY - JOUR AU - Bertoni, D AU - Sarti, G AU - Grottoli, E AU - Ciavola, P AU - Pozzebon, A AU - Domokos, Gábor AU - Novák-Szabó, Tímea TI - Impressive abrasion rates of marked pebbles on a coarse-clastic beach within a 13-month timespan JF - MARINE GEOLOGY J2 - MAR GEOL VL - 381 PY - 2016 SP - 175 EP - 180 PG - 6 SN - 0025-3227 DO - 10.1016/j.margeo.2016.09.010 UR - https://m2.mtmt.hu/api/publication/3126387 ID - 3126387 LA - English DB - MTMT ER -