Rheological Analysis of Mud: Towards an Implementation of the Nautical Bottom Concept in the Port of Hamburg

Research output: ThesisDissertation (TU Delft)

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The nautical bottom (the level at which contact with a ship’s keel causes either damage or unacceptable effects on controllability and manoeuvrability of a ship) should be associated to a measurable physical characteristic. Bulk density is typically used as a criterion for nautical bottom by many ports worldwide. However, the rheological properties particularly the yield stress of mud would be better parameters for defining a criterion for nautical bottom due to their strong correlation with the flow properties of mud and navigability. The density-yield stress correlation depends significantly on different parameters of mud such as organic matter type and content, clay type and content, particle size distribution and salinity. Therefore, a single critical value of density cannot be chosen for the nautical bottom criterion in a port like Port of Hamburg, where the above mentioned parameters are varying from one harbour location to another. This justifies the need for a study of the rheological properties (yield stress) of mud in Port of Hamburg.
Original languageEnglish
Awarding Institution
  • Delft University of Technology
  • Pietrzak, J.D., Supervisor
  • Chassagne, C., Supervisor
  • Kirichek, Alex, Advisor
Award date27 Jun 2022
Print ISBNs978-94-6419-532-3
Publication statusPublished - 2022


  • Mud
  • Rheology
  • Nautical bottom
  • Yield stress
  • Density
  • Organic matter


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