Assessment of river bed evolution with the aid of 2D hydrodynamic model with integrated sediment transport modeling capabilities

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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.

Section: Methodsmentioning

confidence: 99%

The impact of hydropeaking on sediment transport

Buček

Orfánus

Dušička

et al. 2021

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“…While maintaining a sufficient distance of the ship from the upper gate and while appropriately handling the gate opening, the proposed direct filling system may also be used for head exceeding 3 m. The design of the radial gate in the upper head offers many operational advantages, including the option of direct filling of the lock in case of failure of the primary F/E system, transfer of antifreeze flow through the lock, transfer of flood flow and transfer of ice floes. It is necessary to deal with sediment transport of the river bed to eliminate the risk of clogging the lock [17].…”

Section: Verificationmentioning

confidence: 99%

Parametric study of direct filling system of medium-head navigation locks

Kašpar

Fošumpaur

Králík

et al. 2021

As part of the research focusing on the safety of vessels during the lockage in navigation locks, two different 1D numerical modeling approaches were tested. These approaches are used to determine the force effects on vessels during the direct filling process of the navigation lock. These numerical models were verified using data measured on a physical model. Using the selected 1D model, a parametric study focusing on the impact of the basic parameters of the navigation lock including the lifting velocity of the gates on the maximum hawser forces was performed. The research has shown that with a suitable design of the upper gate, the direct filling system may also be used for medium-head navigation locks with a normal lift of up to 5 m.

“…Numerical models are used to solve flow problems in open channels [10], groundwater flow [11] and also sediment transport [12]. The paper describes the evaluation of flow in the intake of a low pressure SHPP.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the impact of intake structure on the flow at low pressure SHPP

Bytčanková

Rumann

Dušička

2021

Self Cite

The structural parts of intake structures directly affect the flow velocity distribution in the turbine intake of small hydropower plants, where inhomogeneous flow leads to uneven load of the turbine units causing operational problems. A 2D numerical flow modeling was used for investigations of the flow in an intake structure of a low-head small hydropower plant. The effects of shape changes of the intake structure on the flow velocity distribution in the turbine intakes were investigated and assessed proving significant effect of the shapes of the intake structure on the flow homogeneity in turbine intakes.