Numerical modelling of the Danube river channel morphological development at the Slovak–Hungarian river section

Lukac, Miroslav; Holubova, K.

doi:10.1201/9781315623207-124

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2021

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“…In the studied section 1,810 km -1,792, the bottom material is very well sorted. It consists mainly of fine to coarse gravel with a predominantly uniform median grain size ranging from 7.8 to 14.4 mm [21]. Similar range of median grain size in studied river section was obtained by method proposed in [22].…”

Section: Methodssupporting

confidence: 76%

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The impact of hydropeaking on sediment transport

Buček

Orfánus

Dušička

et al. 2021

Pollack

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Variable renewable energy sources, e.g. solar and wind power, require flexible management of energy sources to stabilize the power grid. Immediate changes in power generation and power usage is compensated for by the operation of hydropower plants. This subsequently leads to frequent flow fluctuations – hydropeaking downstream of the hydropower plant. This study examines the short-term impacts of hydropeaking of hydropower plants on the sediment transport using numerical morphodynamic model. The model is calibrated to field measurements and subjected to various hydropeaking scenarios on daily to sub-daily scale. Based on this study, the effect of hydropeaking of hydropower plant 23.42 km upstream of the studied river section would have negligible effect on the bedload transport in the studied cross section.

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Section: Methodssupporting

confidence: 76%

“…Median grain size and dimensionless riverbed material porosity fulfill these requirements. The plausible range of median grain size was 7.8-14.4 mm [21]. Plausible dimensionless porosity ranges from coarse sand to medium gravel or 0.39 to 0.32 respectively.…”

Section: Methodsmentioning

confidence: 97%