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The authors are solely responsible for the content of this report. Material included herein does not represent the opinion of the European Community, and the European Community is not responsible for any use that might be made of it.
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The Port of Hamburg has to fight against sedimentation within the harbor basins already for a long time. The reason for the sedimentation in the entrance of the basins is the so called ’teacup-effect‘, an eddy flow which leads to a deposition process in the entrance of the harbor (Fig. 1).
This process is enhanced by the tides: During flood tide large amounts of water flow into the harbor basin. However the low ebb tide energy has a stopping effect on the eddy flow. In order to assure sufficient water depth for shipping, dredging is unpreventable.
The costs for dredging and deposition are very high, especially if the sediment is heavily contaminated as it was in the 1980ies. Model tests, conducted at the Franzius-Insitute of the University of Hannover, demonstrated that a current deflection wall in the entrance of the harbor prevented the eddy flow and the related sedimentation (Fig. 2).
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Current deflection wall ‚Köhlfleet‘
Table of content
- 1. Measure description
- 1a. Introduction
- 1b. Objectives
- 1c. Background and side conditions
- 1d. Measure
- 1e. Expected effect
- 2. Execution of the main effectiveness criteria
- 2a. Effectiveness according to development targets of measure
- 2b. Impact on ecosystem services
- 2c. Degree of synergistic effects and conflicts according the uses
- 3. Additional evaluation criteria in view of EU environmental law
- 3a. Degree of synergistic effects and conflicts according WFD aims
- 3b. Degree of synergistic effects and conflicts according NATURA 2000 aims
- 4. Crux of the matter
- 5. Contact
- 6. References
Additional information
for this measure:
No further information available.
for this measure:
No further information available.
Background and side conditions
The Port of Hamburg has to fight against sedimentation within the harbor basins already for a long time. The reason for the sedimentation in the entrance of the basins is the so called ’teacup-effect‘, an eddy flow which leads to a deposition process in the entrance of the harbor (Fig. 1).
This process is enhanced by the tides: During flood tide large amounts of water flow into the harbor basin. However the low ebb tide energy has a stopping effect on the eddy flow. In order to assure sufficient water depth for shipping, dredging is unpreventable.
The costs for dredging and deposition are very high, especially if the sediment is heavily contaminated as it was in the 1980ies. Model tests, conducted at the Franzius-Insitute of the University of Hannover, demonstrated that a current deflection wall in the entrance of the harbor prevented the eddy flow and the related sedimentation (Fig. 2).