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Measurement and comparison of settling velocities of cohesive sediments from the German estuaries Weser and Ems
Citation Link: https://doi.org/10.15480/882.8640
Publikationstyp
Conference Poster
Date Issued
2023-09-18
Sprache
English
TORE-DOI
Contribution to Conference
17th International Conference on Cohesive Sediment Transport, INTERCOH 2023
Publisher
Justus Patzke @ Intercoh2023, Inha University, Incheon, Korea
Peer Reviewed
false
Settling and sedimentation of fine-grained sediments is a physical phenomenon influenced by bio-geochemical processes that occurs in natural water bodies such as rivers, channels and estuaries. Of particular concern are estuaries maintained for navigation. The deepening of waterways to improve the navigability for ever larger container ships has the potential to intensify sedimentation and the accumulation of cohesive sediments, particularly within the estuarine turbidity maximum (ETM). For example, significant net sedimentation and accumulation are observed in the ETM of the Weser estuary even in the centre of the navigational channel, where high flow velocities favour sediment transport and erosion. Dredging is the main method of maintaining a channel, which requires large financial investment and also has potential negative environmental impacts. In engineering practice, numerical modelling of the ETM and accumulation zones is an important tool to improve channel maintenance. Knowledge of site-specific information on settling velocities is therefore essential, as underlying processes cannot be simulated universally valid yet and require sufficient local parametrisation.
The research project FAUST (For An improved Understanding of estuarine Sediment Transport) addressed the challenge of net sedimentation and accumulation in the navigational channel by investigating the transport properties of cohesive sediments (mainly from the Weser estuary) in field and in laboratory studies. The conceptual design of the project FAUST has been presented in Patzke et al. (2019). Research on sediment erodibility, sediment fractions and density profiles has been published recently (Patzke et al. 2021; Patzke et al. 2022). The follow-up project ELMOD (Simulation and analysis of the hydrological and morphological development of the Tidal Elbe for the period from 2013 to 2018) focuses on sediment transport processes in the Elbe estuary. The findings and derived model parameterisations of the projects contribute to the development of large-scale 3D morphodynamical-numerical models. In this submission, laboratory-derived effective settling velocities of natural cohesive sediments from two German estuaries are examined.
The research project FAUST (For An improved Understanding of estuarine Sediment Transport) addressed the challenge of net sedimentation and accumulation in the navigational channel by investigating the transport properties of cohesive sediments (mainly from the Weser estuary) in field and in laboratory studies. The conceptual design of the project FAUST has been presented in Patzke et al. (2019). Research on sediment erodibility, sediment fractions and density profiles has been published recently (Patzke et al. 2021; Patzke et al. 2022). The follow-up project ELMOD (Simulation and analysis of the hydrological and morphological development of the Tidal Elbe for the period from 2013 to 2018) focuses on sediment transport processes in the Elbe estuary. The findings and derived model parameterisations of the projects contribute to the development of large-scale 3D morphodynamical-numerical models. In this submission, laboratory-derived effective settling velocities of natural cohesive sediments from two German estuaries are examined.
Subjects
cohesive sediments
gelling point
hindered settling
settling velocity
Weser, Ems
DDC Class
550: Earth Sciences, Geology
Funding Organisations
More Funding Information
The authors would like to thank Federal Waterways Engineering and Research Institute (BAW) Germany, which funded the project. Samples are taken with the help of ships and employees from WSA Bremerhaven. We’d like to thank the Hamburg Port Authority for offering ship capacities and ideas to develop a new type of core sampler and the TUHH-Institute of Multiphase Flows for lending the ultrasonic sensor. Last but not least we’d like to thank the students U. Apogo, K. Arkawazi & B. Bakhshi by helping to collect settling velocity data in the lab.
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