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001-es BibID:BIBFORM103812
035-os BibID:(cikkazonosító)e2021WR031821 (WoS)000863634200001 (Scopus)85141708017
Első szerző:Bahmanpouri, Farhad
Cím:Estimating the average river cross section velocity by observing only one surface velocity value and calibrating the entropic parameter / Farhad Bahmanpouri, Anette Eltner, Silvia Barbetta, László Bertalan, Tommaso Moramarco
Dátum:2022
ISSN:0043-1397
Megjegyzések:The current research aims to predict the velocity distribution and discharge rates in rivers based on the entropy concept using only one surface velocity measurement. In this direction, first, UAV-based image acquisition technique was applied to collect the surface velocity distribution along two European rivers, the Sajó and the Freiberger Mulde Rivers. Seven cross-sections were chosen for the analysis. At each cross-section, first, the entropic parameter phí(M) was calibrated based on the maximum and mean velocity magnitudes, derived from Acoustic Doppler Current Profilers (ADCP), respectively, showing a trend for all cross-sections with a range of 0.6 < phí(M) < 0.75. Next, the maximum surface velocity provided by the UAV was implemented as a single velocity input. Finally, the bathymetry data, herein collected by UAV, were considered as the input for the entropy approach. In this way, the entropy iterative method allowed estimating the mean flow velocity by identifying the location (dip) of maximum velocities across the river site and inferring the 2D velocity distribution. The results highlighted that the entropy approach can accurately predict the velocity distribution and discharge rates with a percentage error lower than 13%.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
UAV
entropy method
velocity estimation
discharge estimation
river monitoring
Megjelenés:Water Resources Research. - 58 : 10 (2022), p. 1-15. -
További szerzők:Eltner, Anette Barbetta, Silvia Bertalan László (1989-) (geográfus) Moramarco, Tommaso
Pályázati támogatás:DAAD-TKA : 307670
Egyéb
TKP2020-NKA-04
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2.

001-es BibID:BIBFORM075898
035-os BibID:(cikkazonosító)1613 (Wos)000451736300120 (Scopus)85056238502
Első szerző:Bertalan László (geográfus)
Cím:Issues of Meander Development: Land Degradation or Ecological Value? The Example of the Sajó River, Hungary / Bertalan László, Novák Tibor József, Németh Zoltán, Rodrigo-Comino Jesús, Kertész Ádám, Szabó Szilárd
Dátum:2018
ISSN:2073-4441
Megjegyzések:The extensive destruction of arable lands by the process of lateral bank erosion is a major issue for the alluvial meandering type of rivers all around the world. Nowadays, land managers, stakeholders, and scientists are discussing how this process affects the surrounding landscapes. Usually, due to a land mismanagement of agroforestry activities or urbanization plans, river regulations are designed to reduce anthropogenic impacts such as bank erosion, but many of these regulations resulted in a degradation of habitat diversity. Regardless, there is a lack of information about the possible positive effects of meandering from the ecological point of view. Therefore, the main aim of this study was to investigate a 2.12 km long meandering sub-reach of Sajó River, Hungary, in order to evaluate whether the process of meander development can be evaluated as a land degradation processes or whether it can enhance ecological conservation and sustainability. To achieve this goal, an archive of aerial imagery and UAV (Unmanned Aerial Vehicle)-surveys was used to provide a consistent database for a landscape metrics-based analysis to reveal changes in landscape ecological dynamics. Moreover, an ornithological survey was also carried out to assess the composition and diversity of the avifauna. The forest cover was developed in a remarkable pattern, finding a linear relationship between its rate and channel sinuosity. An increase in forest areas did not enhance the rate of landscape diversity since only its distribution became more compact. Eroding riverbanks provided important nesting sites for colonies of protected and regionally declining migratory bird species such as the sand martin. We revealed that almost 70 years were enough to gain a new habitat system along the river as the linear channel formed to a meandering and more natural state.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
bank erosion
landscape metrics
diversity
uav
Sajó
Megjelenés:Water. - 10 : 11 (2018), p. 1-21. -
További szerzők:Novák Tibor (1973-) (geográfus) Németh Zoltán (1976-) (biológus) Rodrigo-Comino, Jesús Kertész Ádám (1948-) Szabó Szilárd (1974-) (geográfus)
Pályázati támogatás:EFOP-3.6.1-16-2016-00022
EFOP
NKFIH 108755
Egyéb
ÚNKP-17-3
Egyéb
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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