TY - CHAP AU - Ficsor, Johanna AU - Gradwohl-Valkay, Alexandra Ilona ED - Kiss, Emőke ED - Balla, Dániel TI - Folyók morfológiai változásának vizsgálata a Dráva példáján keresztül T2 - Tájökológiai kihívások, adaptációs lehetőségek PB - MTA DTB Földtudományi Szakbizottság CY - Debrecen SN - 9789637064432 PY - 2022 SP - 127 EP - 132 PG - 6 UR - https://m2.mtmt.hu/api/publication/34110532 ID - 34110532 AB - A folyók, mint az egyik legdinamikusabban változó élettér, folyamatainak ismerete nagyon fontos a velük való gazdálkodás helyes módja és annak megtervezése szempontjából. A morfológiai folyamatok, jelenségek ismerete ezek között is kiemelten fontos. Jelen cikkben összegyűjtöttük azokat a fontos összefüggéseket, amelyek relevánsak ebben a tekintetben. A kapott eredményeket, egy példán keresztül, a Dráva horvát – magyar közös szakaszára vonatkozó vizsgálat eredményei alapján mutatjuk be. A Drávára bemutatott eredmények jól szemléltetik, hogy egy alluviális folyószakasz morfológiai változása milyen intenzív lehet. Ez az intenzív változás jelentős hatással van a következő időszak ökoszisztéma-szolgáltatásainak esetleges változására is, ezért ennek ismerete és nyomon követése fontos vízgazdálkodási feladat. LA - Hungarian 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 - CHAP AU - Ficsor, Johanna AU - Gradwohl-Valkay, Alexandra Ilona AU - Pirkhoffer, Ervin AU - Czigány, Szabolcs ED - Ortega-Sánchez, Miguel TI - What is the Current Morphological State of the River Drava T2 - From snow to sea: Proceedings of the 39th IAHR World Congress PB - International Association for Hydro-Environment Engineering and Research (IAHR) CY - Madrid SN - 9789083261218 PY - 2022 SP - 795 EP - 800 PG - 6 DO - 10.3850/IAHR-39WC2521711920221830 UR - https://m2.mtmt.hu/api/publication/33074968 ID - 33074968 LA - English DB - MTMT ER - TY - CHAP AU - Ficsor, Johanna AU - Gradwohl-Valkay, Alexandra Ilona AU - Pirkhoffer, Ervin AU - Czigány, Szabolcs ED - Kalicz, Péter ED - Kamila, Hlavčová ED - Silvia, Kohnová ED - Milica, Aleksić ED - Viera, Rattayová ED - Borbála, Széles ED - Nevezi, Csenge ED - Gribovszki, Zoltán TI - A MORPHOLOGICAL EXAMINATION OF THE DRAVA RIVER T2 - HydroCarpath-2021 Catchment and River Processes in Regional Hydrology: Coupling Field Experiments and Data Assimilation into Process Understanding and Modelling in Carpathian Basins PB - University of Sopron Press CY - Sopron SN - 9789633344149 PY - 2021 SP - 13 EP - 13 PG - 1 SN - 9789633344149 DO - 10.35511/978-963-334-414-9 UR - https://m2.mtmt.hu/api/publication/32615500 ID - 32615500 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 - 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 - 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 - 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 -