Turbulent water flow over rough bed – part I

Książek, Leszek; Bartnik, W.; Rumian, Jacek; Zagórowski, Paweł

doi:10.1088/1742-6596/318/2/022012

Cited by 1 publication

(3 citation statements)

References 5 publications

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“…To date, many researchers have dealt with the problem of hydraulic flow conditions in rivers. Some of them have also studied the spatial distribution of turbulence [15,17,19,25,[28][29][30][31][32][33][34]38,[51][52][53][54]. However, those studies focused on a completely different factor that affects the distribution of turbulence.…”

Section: Final Conclusionmentioning

confidence: 99%

“…In those cases, they mainly studied the effect of a very rough, gravelly riverbed on the distribution of turbulence and turbulent kinetic energy (TKE). Even when there were plants in the river (often common river hydrophytes rather than reeds), their hydraulic influence was not dominant as in the case of gravel-bed rivers [17,28,[32][33][34]52]. There are known laboratory studies where the influence of plant zones on stream turbulence and flow conditions was also tested.…”

Section: Final Conclusionmentioning

confidence: 99%

“…It determines the size of the vortices that form in turbulent motion [25,26]. Although the analysis of the vorticity of flow in riverbeds is a complex problem of paramount importance [27,28], it is, however, not the main focus of this research. Instead, we focused primarily on the reeds in a riverbed.…”

Section: Introductionmentioning

confidence: 99%

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Hydraulic Effect of Vegetation Zones in Open Channels: An Experimental Study of the Distribution of Turbulence

Tymiński,

Wolski

2023

Sustainability

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The development of vegetation in riverbeds is an important part of river engineering, and an in-depth understanding of its hydraulic influence is greatly needed. Our research focuses primarily on common reed (Phragmites australis) in riverbeds. To date, little is known about the hydraulic impact of the Phragmites australis reed and both field and laboratory data are still very scarce. Consequently, the main goal of our study was to evaluate the effect of vegetation zones on the spatial distribution of turbulence. Based on laboratory measurements of local instantaneous velocities, the values of the turbulence intensity (degree) Tu were determined, and its spatial distribution was illustrated. Analysis of the results showed that the relatively dense clusters of plants (reeds) act as “openwork deflectors” of the current and very clearly shape its spatial distribution. This can also be observed in the case of the distribution of the turbulence parameter Tu. For example, in the case of the development of riparian vegetation in the form of quasi-triangular communities of common reed (Phragmites australis) located alternately, there is a channelization of the flow, but also spatial changes in its character that occur. This work only presents results for preliminary hydraulic tests for Phragmites reed. These experiments should also be continued for other species of flexible riparian vegetation such as wicker. In the laboratory, the hydraulic influence of only triangle-shaped vegetation zones has been studied. Therefore, there is also a need for further hydraulic studies on vegetation zones of shapes other than triangular, e.g., rectangular, as well as vegetation zones with irregular shapes The authors see the need for such research and have already planned its continuation. Research on the interactions between vegetation and the structure of water flow in the riverbed is a very important aspect of contemporary trends in river environment management. Conscious, planned, and model-tested locating (or removing) of vegetation in a stream allows for shaping hydraulic and morphological conditions, thus controlling the processes of erosion, transport, and accumulation of debris.

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