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15 years experience with fluid mud: definition of the nautical bottom with rheological parameters
Wurpts, R. (2005). 15 years experience with fluid mud: definition of the nautical bottom with rheological parameters. Terra et Aqua (99): 22-32
In: Terra et Aqua: International Journal on Public Works, Ports and Waterways Developments. International Association of Dredging Companies (IADC): The Hague. ISSN 0376-6411, more
Peer reviewed article  

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Keywords
    Bottom topography; Fluid mud; Rheology; Marine

Author  Top 
  • Wurpts, R.

Abstract
    In the contract of 1954 between the German Federal Waterways Administration and the newly formed Water and Land Federation Emden-Riepe, the Federation relinquished agricultural land within the Emden-Riepe Lowland to the Association of Port Operators to accommodate sediment from the Port of Emden which at that time was still classified as mud. This policy continued through the 1980s. During the privatisation of maintenance dredging in 1986, first concepts to reduce the, at that time, considerable amounts of sediment were drawn up. The costs of maintaining the nautical depths in the Port of Emden were significant, and in 1990 the provincial government issued an order to stop flushing in Riepe. Since 1990 the layer in the Outer Harbour of Emden has been kept in its natural balance in situ, by using a dredging system that was specially developed in Emden. The question of whether the technique developed in Emden can be adapted for other harbours with a higher sand content has triggered a series of tests which are also discussed.

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