The Impact of Microtopography and Drainage on Land Use and Settlement Development in the Hungarian Drava Plain

Gyenizse, Péter; Lóczy, Dénes

doi:10.21861/hgg.2010.72.01.01

Cited by 7 publications

(6 citation statements)

References 1 publication

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“…Most hydro‐technical works were conducted between 1842 and 1846. A map dating from the beginning of the 19th century (see Gyenizse and Lóczy, ) shows that the Drava valley was a wetland area at that time, cut by small tributaries with numerous mills on their courses. However, the wetlands disappeared at the end of the 19th century after the construction of a network of drainage ditches.…”

Section: Resultsmentioning

confidence: 93%

“…() show that the lower Drava meandered (Figures and (a)), with sinuosity of the river bed equal to 2.00. At the time of the drawing of these maps the river valley had already been transformed by humans via the construction of flood defence dikes in 1740–1750 (Gyenizse and Lóczy, ). Between 1787 and 1806 the river bed was artificially straightened to improve navigation conditions, as shown on the maps from the Second Military Survey (1806–1869).…”

Section: Resultsmentioning

confidence: 99%

“…The valley is built of silts, silty sands and aeolian sands (cf. Gyenizse and Lóczy, ); terrace levels are preserved in the modern land surface in some places. The floodplain is surrounded by flood protection dikes.…”

Section: Study Areamentioning

confidence: 97%

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Evolution of river planforms downstream of dams: Effect of dam construction or earlier human‐induced changes?

Słowik

Dezső

Marciniak

et al. 2018

Earth Surf Processes Landf

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When studying the evolution of landscape, it is difficult to discriminate the influence of anthropogenic from natural causes, or recognise changes caused by different sources of human action. This is especially challenging when the influence of certain sources is overprinted. For instance, although dam closure is the most common method of altering river courses, dam construction is often preceded by hydro-technical works such as channel straightening, embankment construction or sediment mining. Both dam construction and the hydro-technical works that precede dam closure can result in changes in the balance between sediment supply and transport capacity, and often, changes in river planform.The main objective of this study was to verify whether the works preceding dam closure are an important driver of river planform changes on the lower Drava River (Hungary). The case study is based on geological and geophysical surveys, as well as the analysis of historical maps covering an anabranching, 23 km long valley section. We show that channel straightening conducted prior to dam closure resulted in a transition from a meandering to sinuous planform with channel bars. Dam construction itself then caused enhanced incision, exposure of bar surfaces, vegetation encroachment and the formation of an anabranching planform. Based on this study, we developed models of alluvial island and channel planform evolution downstream of dams. Dam construction enhances channel incision, narrowing, and the reduction of flow caused by earlier hydro-technical works. Many rivers downstream of dams experience episodes of anabranching or wandering, with a multi-thread pattern replacing sinuous, braided and meandering courses. When incision continues, river patterns evolve from anabranching to sinuous via the attachment of alluvial islands to floodplains. However, the timing and sequence of these changes depend on hydrological and sediment supply regimes, geomorphic settings and anthropogenic actions accompanying dam construction.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Evolution of river planforms downstream of dams: Effect of dam construction or earlier human‐induced changes?

Słowik

Dezső

Marciniak

et al. 2018

Earth Surf Processes Landf

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“…Constructions of flood dense dikes took place in the years 1740-1750 (Gyenizse & L oczy, 2010). Next, the Drava river bed was straightened by hydro-technical works and a network of drainage ditches was constructed to dry the riverine wetlands in the 19th century (cf.…”

Section: Anthropogenic Impactmentioning

confidence: 99%

“…The formation of the meander belts in the lower Drava was terminated by channel straightening followed by the constructions of irrigation canals and dams (cf. Gyenizse & L oczy, 2010;Słowik et al, 2018).…”

Section: Influence Of Climate-driven Changesmentioning

confidence: 99%

The evolution of meandering rivers in sedimentary basins: Insights from the lower Drava (Hungary/Croatia)

Słowik,

Dezső,

Salem

et al. 2023

Earth Surf Processes Landf

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Rivers flowing through sedimentary basins are subjected to a variety of controls. The main goal of our study was to identify the effect of external (e.g. climate changes, tectonics) and internal controls (e.g. sediment transport, deposition, vegetation cover) on the evolution of meandering rivers flowing through sedimentary basins using the example of the lower Drava River (Europe, Hungary/Croatia). Field research was conducted along a 50‐km‐long section of the valley. Sedimentary data from boreholes and corings, 35 km of ground‐penetrating radar surveys and analyses of digital maps were conducted to reconstruct channel planform changes. Traces of four meander belts were identified, and 39 AMS radiocarbon dates were used to distinguish the chronology of the fluvial events. The evolution of the lower Drava River comprised alternating periods of deposition (formation of aggrading meander belt) and avulsions. The channel belts were formed owing to upstream sediment delivery and floodplain storage. Changes in climate humidity and the occurrence of high flows influenced the planform of the meanders within particular channel belts. The oldest channel was active at least ~40 000 cal. BP before being reworked by subsequent meanders active between the Late Pleniglacial (30 000–14 700 cal. BP) and Late Glacial (~11 000 cal. BP) periods. The channel belts shifted to the south in the Holocene, between ~11 000 and 250 cal. BP due to the presence of a thrust fault situated diagonally to the Drava Valley. Results show channel width, channel belt width and the surface area of point bar deposits increased in the succeeding generations of meanders and that the style and sedimentary architecture of the channel belts were dominantly dependent on autogenic controls, that is, sediment delivery, aggradation and erosional events (e.g. formation of chute cut‐offs).

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Oxbow Lakes: Hydromorphology

et al. 2018

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The Impact of Microtopography and Drainage on Land Use and Settlement Development in the Hungarian Drava Plain

Cited by 7 publications

References 1 publication

Evolution of river planforms downstream of dams: Effect of dam construction or earlier human‐induced changes?

Evolution of river planforms downstream of dams: Effect of dam construction or earlier human‐induced changes?

The evolution of meandering rivers in sedimentary basins: Insights from the lower Drava (Hungary/Croatia)

Oxbow Lakes: Hydromorphology

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