Present practice of using nautical depth to manage navigation channels in the presence of fluid mud

Welp, Timothy; Tubman, Michael

doi:10.21079/11681/22539

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The last category described in Kirby's review (2011), KSN, is comparable to the remobilising systems but differs in the point that it does not aim at evacuating the sediment from the port or harbour, but instead relies on the fact that some sediment types are navigable when brought into suspension (Kirby et al, 2008;Welp and Tubman, 2017). Keep sediment navigable works on the concept of nautical depth and mostly involves the method called Active Nautical Depth (AND).…”

Section: Overview Of Alternatives To Dredgingmentioning

confidence: 99%

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Combining sediment management and bioremediation in muddy ports and harbours: A review

Polrot

Kirby

Birkett

et al. 2021

Environmental Pollution

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Section: Overview Of Alternatives To Dredgingmentioning

confidence: 99%

“…As a consequence, for each port the density at which the sediment is in a fluid mud state has to be determined. In muddy ports with low sand content, the most often used density threshold is 1,200 kg.m -3 (Welp and Tubman, 2017). The concept of Passive Nautical…”

Section: 21 Principlesmentioning

confidence: 99%

Combining sediment management and bioremediation in muddy ports and harbours: A review

Polrot

Kirby

Birkett

et al. 2021

Environmental Pollution

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Detection of fluid mud layers using tuning fork, dual-frequency echo sounder, and chirp sub-bottom measurements

2020

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Effects of recirculation dredging on density, strength, settling and oxygen concentration of fluid mud in the port of Emden

Chamanmotlagh,

Kirichek,

Gebert

2024

J Soils Sediments

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Purpose Recirculation dredging is a port maintenance concept developed in the Port of Emden, Germany to create a navigable fluid mud layer. This study investigates the effects of recirculation on key sediment properties, including density, yield stress, and oxygen concentration. Methods Six field monitoring surveys were carried out at two locations at different times of the year to assess changes before and after recirculation. Bathymetry, bulk density, yield stress, and oxygen concentration profiles were measured in situ. The settling properties and oxygen concentration levels on collected fluid mud samples were analyzed in the laboratory. Results The investigation reveals minimal changes in the density of recirculated fluid mud. However, the post-recirculation measurements showed a decrease in yield stress, ranging from 18 to 51% at Große Seeschleuse (GS) and 36% to 52% at Industriehafen (IH). The yield stress and density vary depending on the frequency of dredging. After structural density (1166 kg m−3 in GS and 1173 kg m−3 in IH), the yield stress of fluid mud increased exponentially. Therefore, monitoring of the yield stress is important for recirculation. A slight increase in oxygen concentration was observed post-recirculation, especially during winter. Yet, the rapid decline in oxygen levels post-mixing in the laboratory showed that sustaining long-term elevated oxygenation levels is not feasible by recirculation dredging alone. Conclusions The findings highlight the effectiveness of the recirculation on the yield stress, density, and oxygen concentration of fluid mud and illustrate the importance of considering both density and yield stress in sediment management practices. Future research should address the temporal evolution of density, yield stress, and oxygen levels following a dredging intervention and the influence of extracellular polymeric substances (EPS) and organic matter decay on sediment behavior.

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Present practice of using nautical depth to manage navigation channels in the presence of fluid mud

Cited by 3 publications

References 3 publications

Combining sediment management and bioremediation in muddy ports and harbours: A review

Combining sediment management and bioremediation in muddy ports and harbours: A review

Detection of fluid mud layers using tuning fork, dual-frequency echo sounder, and chirp sub-bottom measurements

Effects of recirculation dredging on density, strength, settling and oxygen concentration of fluid mud in the port of Emden

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