Channel migration inferred from aerial photographs, its timing and environmental consequences as responses to floods: A case study of the meandering Topľa River, Slovak Carpathians

Rusnák, Miloš; Lehotský, Milan; Kidová, Anna

doi:10.1515/mgr-2016-0015

Cited by 15 publications

(12 citation statements)

References 45 publications

(42 reference statements)

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“…Morphological changes allow registering high rates of bank erosion, which in similar investigations in other European rivers, was also calculated [3,73,74]; however, the extent of arable lands lost by lateral erosion is not an outstanding value compared to other rivers with similar geomorphological patterns [75]. In this way, it would be a great opportunity to include in future investigations the correlation between these morphological alterations, the changes in the biodiversity and the bank erosion rates.…”

Section: Discussionmentioning

confidence: 79%

Issues of Meander Development: Land Degradation or Ecological Value? The Example of the Sajó River, Hungary

Bertalan

Novák

Németh

et al. 2018

Water

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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.

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Section: Discussionmentioning

confidence: 79%

Issues of Meander Development: Land Degradation or Ecological Value? The Example of the Sajó River, Hungary

Bertalan

Novák

Németh

et al. 2018

Water

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“…Lately gravel mining and river sediment replacing definitely support this trend in time when the opposite nature-based management approaches and challenges (channel renaturalization of the rare and unique river system in Slovakia -NATURA 2000, protected area) are the most desirable [ 7,11,12,13,14]. Similar development on the east Slovak the river Ondava and the Topľa with decrease channel width from 87.6m to 32.6m and from 62.1m to 27.2m confirms the necessity to protect so vulnerable natural elements [15,16,17,18]. Responsible river management with protection from gravel mining and green approaches to reduction flood risk are essential for sustainable development of natural active channels.…”

Section: Final Remarksmentioning

confidence: 85%

Gravel and boulders mining from mountain stream beds

et al. 2019

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Mountain stream gravel is very often legally and illegally mined and gravel is removed from river beds sometimes on the very large scale which is disastrous for fluvial situation of rivers, for river ecology and river engineering works done for flood protection such as river revetments, bridges and all hydraulic structures. This situation makes a big problem for all river managers. Thus gravel mining of the mountain streams in the Polish Carpathians is the subject of many scientific studies when we observe river problems, but also it has a place in Slovakia. This paper deals with such problems additionally showing examples of such bad practices.

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“…Na Slovensku sa v oblasti fluviálnej geomorfológie doposiaľ aplikovali predovšetkým metódy, ktoré sa viažu na analýzy spojené s terénnym prieskumom (analýza priečnych profilov, pozdĺžneho profilu, hierarchickej klasifikácie morfológie riek, hydromorfologický prieskum, analýza sedimentovnapr. Lehotský a Lacika 2007, Medveďová et al 2007, Tomčíková 2007, Anstead a Barabas 2013 a Frandofer a Lehotský 2013) a dištančné metódy založené na získavaní priestorových údajov z historických máp (Pišút 1995(Pišút , 2002(Pišút , 2006 a 2008 a Pišút a Tomčíková 2008) a leteckých snímok (Novotný et al 2007, Frandofer a Lehotský 2014, Rusnák a Lehotský 2014, Kidová et al 2016, Rusnák et al 2016ba Novotný a Cebecauerová 2016.…”

Section: úVodunclassified

Využitie UAV technológie pre klasifikáciu a mapovanie krajiny vo fluviálnej geomorfológii

Rusnák¹,

Sládek²,

Kidová³

2018

geogrcas

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Using UAV technology for landscape classification and mapping in fluvial geomorphologyThe aim of this paper is to present the possibilities of UAVs (Unmanned Aerial Vehicles) as photogrammetry payload carriers for data acquisition and fluvial landform identification and mapping. The manual and automatic classification of the Belá River riparian zone for landscape object identification and the analyses of the point cloud density after vegetation filtration was performed. The HEXAKOPTER XL including the Sony NEX 6 camera with 16 -50 mm lens for landscape monitoring features was used. Data was processed in Agisoft PhotoScan software. The RMSE (root mean square error) of aligned images was 60.121 mm (x coordinate), 43.7584 mm (y coordinate) and 29.46 mm (z coordinate). The resulting point cloud was semiautomatic classified in the software Terrasolid -Terrascan (Microstation), in the following six classes: high vegetation (over 5 m), medium vegetation (from 1.5 m to 5 m), small vegetation (from 0.2 m to 1.5 m), topographic surface and water surface. Orthophotomosaic was classified in ArcGIS software by supervised Maximum Likelihood Classification (MLC). Here training site signatures identified the five land cover categories (water area, bar surface, vegetation, Large Woody Debris -LWD and bare surface). The classification of photogrammetric derived point clouds increases the accuracy elevation model, but on the other hand, does not capture the real terrain and topography under the vegetation.

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Channel migration inferred from aerial photographs, its timing and environmental consequences as responses to floods: A case study of the meandering Topľa River, Slovak Carpathians

Cited by 15 publications

References 45 publications

Issues of Meander Development: Land Degradation or Ecological Value? The Example of the Sajó River, Hungary

Issues of Meander Development: Land Degradation or Ecological Value? The Example of the Sajó River, Hungary

Gravel and boulders mining from mountain stream beds

Využitie UAV technológie pre klasifikáciu a mapovanie krajiny vo fluviálnej geomorfológii

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