Eine ökologische und ökonomische Alternative zu Hopperbaggerungen Wasserinjektionsbaggerungen in der Unterweser
Water injection dredging in the Lower Weser - An ecological and economical alternative to hopper dredging Water injection dredging has gained acceptance as a sucoessful technique for main-taining proper depths in harbours and small fairway areas. This applies in particular when the excavated materia...
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| Veröffentlicht in: | Hansa |
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| Format: | UnknownFormat |
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Hamburg
2006
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Tag hinzufügen | Zusammenfassung: | Water injection dredging in the Lower Weser - An ecological and economical alternative to hopper dredging Water injection dredging has gained acceptance as a sucoessful technique for main-taining proper depths in harbours and small fairway areas. This applies in particular when the excavated material consists of fine-grained Sediments (e.g. silt). There are only isolated cases involving experience with large-scale application of the water injection dredging technique in estuaries with Sediments consisting of medium- to coarse-grained sand components.The Weser is one of the largest rivers in Ger-many. The section of the river between Bremen : and Bremerhaven is designated as the Lower Weser and represents a very important wa-terway for maritime and inland shipping. The morphology is largely characterized by under-water dunes (so-called transport bodies) that show amplitudes of up to 4 metres. The shifting dune ridges, consisting of medium- to coarse-grained sands, cause inadequate depths and ' thus obstacles for shipping. Up to 2003 hopper dredgers were used to carry out the necessary maintenance dredging work. Because of the relatively small dredging sites and the shifting dune ridges, dredging costs per cubic metre numbered among the highest within the Ger-; man tidal estuaries.For this reason a long-term and large-scale : study was launched in 2003 to determine the capability of water injection dredgers to elimi-nate inadequate depths in the Lower Weser. ; This paper presents the results of the investi-gations. At the same time the water injection technique is compared to the hopper dredging rjnethod. This relates in particular to the ecological and economic aspects. |
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| Beschreibung: | 69-73 |
| ISSN: | 0017-7504 |