Return period of low water periods in the river Rhine

Brenk, Saskia Van; Lokin, Lieke; Warmink, Jord Jurriaan; Hulscher, Suzanne J.M.H.

doi:10.3850/iahr-39wc2521711920221485

Cited by 3 publications

(2 citation statements)

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“…A period of 75–90 days with a continuously low discharge is possible (Van Brenk et al., 2022), but the same amount of days with a high discharge in a perennial, rain dominated river is not very likely. Dune height development during the rising limb of a flood wave shows hysteresis with the changes in discharge (Bagnold, 1966; Warmink, 2014).…”

Section: Resultsmentioning

confidence: 99%

The Effect of Sediment Transport Models on Simulating River Dune Dynamics

Lokin,

Warmink,

Hulscher

2023

Water Resources Research

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River dunes, dynamic bedforms in the river bed, limit navigable depths during low flows and increase bed roughness. To predict the navigable depth or where maintenance dredging is needed, a numerical dune development model can be a powerful tool. To study the effect of sediment transport on dune shape and propagation, four different sediment transport models were applied in an existing dune development model. Each sediment transport model was able to simulate dune propagation, while only sediment transport models based on the shear stress reshaped the river dunes. The tested sediment transport models can simulate dune celerity similar to observations and realistic, though different, dune shapes for low and median discharges. Implementation of a gravitational bed slope effect combined with a critical shear stress results in low angle dunes, which are representative for river dunes during low river flows. Sediment transport models with spatial relaxation, also result in low angle dunes. However, the relaxation parameters need to be redefined for low flow situation to prevent transition to upper stage plane bed at too low flow velocities. Further analysis of the resulting dune shapes shows that the sediment transport model determines the dune shape in terms of slope angles, while the dune height is related to the total transport capacity.

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Section: Resultsmentioning

confidence: 99%

The Effect of Sediment Transport Models on Simulating River Dune Dynamics

Lokin,

Warmink,

Hulscher

2023

Water Resources Research

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“…In the second period, from March to May, the discharge was relatively constant around the 30-year median discharge, Q median ≈ 1,500 m 3 /s, whereafter the discharge dropped during June. The third period, from July to November, is characterized by extremely low discharges, Q low ≈ 600 m 3 /s, of which the smallest discharge is estimated as a 1:20 years event (van Brenk, 2021).…”

Section: The Waal River: Study Area and Datamentioning

confidence: 99%

River Dune Dynamics During Low Flows

Lokin

Warmink

Bomers

et al. 2022

Geophysical Research Letters

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River dunes are dynamic and periodic bedforms in sand and gravel bed rivers, which propagate in a streamwise direction. Understanding of river dune dynamics is essential for river management. Dune shape, in combination with celerity, is a proxy for sediment transport (McElroy & Mohrig, 2009;Zomer et al., 2021), which is an important quantity to calibrate morphological models. Such models can support dredging operations to enable safe navigation. Little is known about dune dynamics during low flows due to a focus on dune dynamics during high flows (Julien & Klaassen, 1995;Wilbers, 2003) for roughness and water level predictions (Naqshband et al., 2017; van Duin et al., 2017). Low flow is defined by a sediment transport capacity just above the threshold of motion.River dune dynamics have been studied by a wide range of methods: flume experiments (

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River Dune Behavior in Dredged Areas

Lokin,

Kruis,

Van Denderen

et al. 2024

JGR Earth Surface

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Safe navigation in rivers often requires repeated dredging operations. River dunes are causing shallow areas, so a better understanding of dune behavior can aid decision‐making on dredging strategies. A new dune‐tracking method was developed to analyze dunes after dredging. This knowledge was combined with information on dredging methods and intensity. This enables the analysis of dune development after dredging and the assessment of the impact of dredging methods such as topping (removing sediment from the crest) and swiping (transferring sediment from the crest to the trough). The results show that dredging increases the growth rate of dunes, especially when the discharge increases after dredging. For the studied dredging intensities, topping has a more pronounced effect than swiping on the immediate reduction of dune height. The changes in dune heights due to dredging are within the natural dune height variability. In the long term, topped dunes exhibit larger growth rates than those undergoing swiping. So dredging does have an effect on dune dynamics, in particular on the dune height growth rates.

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Return period of low water periods in the river Rhine

Cited by 3 publications

References 0 publications

The Effect of Sediment Transport Models on Simulating River Dune Dynamics

The Effect of Sediment Transport Models on Simulating River Dune Dynamics

River Dune Dynamics During Low Flows

River Dune Behavior in Dredged Areas

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