Lenkbuhnen zur Strukturierung und Stabilisierung von Fließgewässern

Sindelar, Christine; Mende, Matthias

doi:10.1007/bf03241524

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…The sickle‐formed constrictor is a structural measure that is assumed to enhance hydraulic diversity and thus the quality of the river bed substratum (Sindelar and Mende, ). This is supposed to be caused by an enhanced current speed in the middle of the constrictor where fine sediment is washed out and coarse substratum is relocated.…”

Section: Methodsmentioning

confidence: 99%

A Comparison of Four Stream Substratum Restoration Techniques Concerning Interstitial Conditions and Downstream Effects

Pander

Mueller

Geist

2014

River Research & Apps

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Stream substratum plays a key role for many riverine species and has become a focus topic in the context of structural habitat improvements. There is a lack of studies that compare the effectiveness of different substratum restoration measures. Herein, we compare four restoration techniques (two different gravel introductions, substratum raking and sickle-formed constrictor) that were carried out in six replicate rivers. Each measure was monitored for changes in physicochemical substratum quality and the effects of the construction work on downstream sites. Generally, the effects on physicochemical substratum quality were highly variable between restoration types and rivers and strongly decreased within 1 year. Most pronounced changes of substratum quality were detected for the gravel introductions. Substratum raking and the sickle-formed constrictor had the smallest effects, which were dependent on the original substratum composition of the restored sites. At the same time, substratum raking caused an average fine sediment deposition of 17 kg m À2 on downstream sites, being sixfold higher than for the other measures. Consequently, all of the investigated substratum restoration techniques are confined to short-term improvement of substratum quality. This finding, together with the observed damage on downstream sites, suggests that a rethinking of the currently applied restoration techniques is required, better considering catchment and natural substratum dynamics in river restoration.

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Section: Methodsmentioning

confidence: 99%

A Comparison of Four Stream Substratum Restoration Techniques Concerning Interstitial Conditions and Downstream Effects

Pander

Mueller

Geist

2014

River Research & Apps

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“…Sindelar and Mende (2009) used micro‐groynes (in German, ‘Lenkbuhnen’) as an ecological stabilisation measure. Micro‐groynes are structures that are already completely submerged at low flow and therefore have a different effect than conventional groynes (Sindelar & Mende, 2009). They describe the effect of micro‐groynes with strong submergence.…”

Section: Introductionmentioning

confidence: 99%

“…The sensitivity of the groyne parameters to the hydromorphological balance is also confirmed. Sindelar and Mende (2009) used micro-groynes (in German, 'Lenkbuhnen') as an ecological stabilisation measure. Micro-groynes are structures that are already completely submerged at low flow and therefore have a different effect than conventional groynes (Sindelar & Mende, 2009).…”

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confidence: 99%

Development of innovative groynes to establish fish passability of regulated rivers based on the example of the Wien River, Austria. Part I: Impact of groyne parameters on water depth and velocity

Lasinger,

Leutgöb,

Habersack

et al. 2024

River Research & Apps

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Rivers in Europe have been heavily modified over the last 200 years, with a significant impact on their ecology and environment. This also applies to rivers like the Wien River, Austria, which are designed as overwide concrete channels for the benefit of flood protection. To achieve a good ecological potential in such heavily modified water bodies, one key element is fish passability. This requires an increase in the water level at low flow conditions and a reduction of the flow velocity. The aim of this study is to assess whether groynes are suitable for this application. A design study was conducted to examine the effect of individual groyne parameters on water depths and velocities. Physical experiments were carried out in a laboratory flume at a scale of 1:8. In addition, a 2D numerical model was used. It was found that the groynes had to be submerged and the alignment had to be repelling to achieve both requirements. The configuration of the groyne height, distance and degree of obstruction parameters were crucial. The groyne angle and shape had a minor effect and can be used for fine‐tuning. The best groyne design created a passable section for fish. Thereby, and through sedimentation, the best design contributed to an ecological improvement. However, it did not create habitats and did not constitute a fullfledged restoration. In general, submerged groynes can fulfil the hydraulic requirements for fish passage in heavily modified water bodies with a fixed bed.

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Einige wasserbauliche Folgerungen aus der lateral gerichteten Sedimentation in der Walzenströmung

Botsch

2018

Morphologie Von Sandbänken in Fließenden Gewässern Und Buhnenfeldern

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Lenkbuhnen zur Strukturierung und Stabilisierung von Fließgewässern

Cited by 8 publications

References 2 publications

A Comparison of Four Stream Substratum Restoration Techniques Concerning Interstitial Conditions and Downstream Effects

A Comparison of Four Stream Substratum Restoration Techniques Concerning Interstitial Conditions and Downstream Effects

Development of innovative groynes to establish fish passability of regulated rivers based on the example of the Wien River, Austria. Part I: Impact of groyne parameters on water depth and velocity

Einige wasserbauliche Folgerungen aus der lateral gerichteten Sedimentation in der Walzenströmung

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