Centurial Changes in the Depth Conditions of a Regulated River: Case Study of the Lower Tisza River, Hungary

Amissah, Gabriel J.; Kiss, Tímea; Fiala, Károly

doi:10.1515/jengeo-2017-0005

Cited by 6 publications

(11 citation statements)

References 46 publications

(49 reference statements)

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“…Besides these, we calculated the cross-sectional area (area of cross section up to the bankfull level), the bankfull width (width of cross section at the bankfull level) and the mean width (ratio of cross-sectional area to thalweg depth). Along the studied Lower Tisza, the channel regulations started in 1855, shortening the originally 131 km long studied river segment by more than 40 km, cutting off 12 meanders [23,28]. The originally 6-8 km wide natural floodplain was reduced to 1 km on average.…”

Section: Methodsmentioning

confidence: 99%

“…Along the studied Lower Tisza, the channel regulations started in 1855, shortening the originally 131 km long studied river segment by more than 40 km, cutting off 12 meanders [23,28]. The originally 6-8 km wide natural floodplain was reduced to 1 km on average.…”

Section: Regulation Workmentioning

confidence: 99%

“…The impact of climate change on rivers and river systems has been widely investigated in recent decades [8,[14][15][16][17][18][19]. Likewise, several studies have been conducted on the various human impacts on rivers [20][21][22][23][24][25][26][27][28]. The distortion of the fluvial forms in relation to the abovementioned parameters could be connected to the interplay of bed topography, flow field and sediment transport, and anthropogenic changes in channel morphology [11,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Morphological Evolution of the Lower Tisza River (Hungary) in the 20th Century in Response to Human Interventions

Amissah

Kiss

Fiala³

2018

Water

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To understand the hydro-morphological responses of a river to engineering works is a key to future sustainable engineering projects. The Tisza River in the Carpathian Basin has been the subject of human interventions in the 19th-20th centuries, with regular monitoring since the first intervention. Therefore, it provides a unique opportunity to understand the long-term responses of a lowland river on engineering works. Here the interventions include the construction of embanked levees, artificial meander cutoffs, construction of revetments and groynes, and construction of lock-dams, whose differing effects can be analysed in detail. The Lower Tisza River, Hungary was shortened by up to a third of its 89-km length during late-19th-century regulation works. Simultaneously, it was disconnected from its 10-20 km wide natural floodplain, which was restricted to 1-5 km. Revetments were constructed along 25% of the banks since the early 20th century. This paper evaluates the effects of these regulation works on the Lower Tisza channel based on channel-surveys (1891, 1931, 1961, 1976 and 1999). Based on the results, the channel responded to every stage of the regulation works by adjusting its cross-sectional area, thalweg depth and bankfull width. From 1891 to 1961, the cross-sectional area of the channel increased in response to the artificial meander cutoffs through rapid incision and channel widening. The construction of revetments and groynes distorted this morphological development. After their construction, the cross-sectional area of the channel reduced by up to 50% between 1961 and 1976. The channel experienced incision and narrowing within this period. Whilst the morphological response of the river to cutoffs was improved flood conveyance, the revetments drastically decreased the flood conveyance; therefore, the flood levels increased without an increase in discharge, so the revetment constructions indirectly increased the flood risk.

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Section: Methodsmentioning

confidence: 99%

Section: Regulation Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological Evolution of the Lower Tisza River (Hungary) in the 20th Century in Response to Human Interventions

Amissah

Kiss

Fiala³

2018

Water

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“…50°) create the necessary conditions for the slips and toppling into the channel. This is mainly through thalweg incision as a result of the channel response to the various human interventions in the Lower Tisza (Amissah et al, 2017), thus, though this study area is not directly influenced by human impact, the propagating effects of the engineering works influence the processes here as well. The high erosion rates create failure blocks and slump debris in front of the eroding bank.…”

Section: Landscape and Environmentmentioning

confidence: 98%

“…It can be explained by the fact, that the erosion of the concave bank created favorable conditions (wide channel) for the development of the bar on the convex bank which translates and migrates downstream. On the contrary, at the revetted section at Csongrád, the point-bar develops in a confined channel, which is characterized by incision (Amissah et al, 2017(Amissah et al, , 2018. This incision also affects the point-bar's surface, lowering it, though smaller in-channel flood waves might deposit some material on the surface.…”

Section: Point-bar Development and Its Influencing Factorsmentioning

confidence: 99%

Active point bar development and river bank erosion in the incising channel of the lower Tisza river, Hungary

Amissah

Kiss

Fiala³

2019

Landsc. environ.

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The development of point-bars and bank erosion are critical near-bank processes, as they indicatethe sediment and hydraulic regime of a river system, thus, they refer to the equilibrium conditions ofa channel. However, throughout history, rivers have been modified for various benefits which changethe development of point-bars and the rate of bank erosion. In the Lower Tisza River (Hungary), riverregulations influenced the channel and floodplain development, altering the natural fluvial processes.The aim of the research was to determine the rate of near-bank processes and to make trajectory forfuture river evolution to support future engineering works. The bank erosion and point-bar developmentat human-influenced and freely meandering sections of the Tisza River were monitored since 2011.Behind a collapsed revetment, the bank erosion rate was 0.6 m/y, while at a freely meandering section itwas 2.3 m/y. The studied point-bars are located in revetted and freely meandering sections. Their surfaceeroded within the period. These intensive erosional processes refer to an incising meandering channel,which must be considered during future planning of in-channel structures (e.g. revetments, bridges),thus, geomorphic methods must be considered in any river engineering scheme.

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The Danube Delta Environment Changes Generated by Human Activities

Duţu

Panin

Duţu

et al. 2022

Earth and Environmental Sciences Library

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Centurial Changes in the Depth Conditions of a Regulated River: Case Study of the Lower Tisza River, Hungary

Cited by 6 publications

References 46 publications

Morphological Evolution of the Lower Tisza River (Hungary) in the 20th Century in Response to Human Interventions

Morphological Evolution of the Lower Tisza River (Hungary) in the 20th Century in Response to Human Interventions

Active point bar development and river bank erosion in the incising channel of the lower Tisza river, Hungary

The Danube Delta Environment Changes Generated by Human Activities

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