Download PDF by Institution of Civil Engineers: 2nd International Conference on Maintenance Dredging

By Institution of Civil Engineers

ISBN-10: 0727732889

ISBN-13: 9780727732880

This quantity offers the lawsuits of the 2d overseas convention on upkeep Dredging in could 2004. the aim of the convention was once to supply a complete replace on all elements of upkeep dredging together with law, dredging equipment, dredged fabric remedy and precious use, agreement administration, and environmental influence evaluate and mitigation

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Recent Developments in Trailing Suction Dredgers Mr. S. Vandycke, Dredging International, Zwijndrecht, Belgium Abstract The design and constructing of a trailing suction hopper dredger - TSHD - has always been a special event in which all conventional ship design parameters were rearranged. Compared to a commercial vessel, a TSHD was a very costly vessel for its size. One of the most extraordinary design parameters is that the vessel will sail for 50% of the time empty. This is unthinkable for any commercial cargo vessel, but a given fact for a hopper dredge, and this fact influences the complete design of the vessel.

There are a number of other sites on the Thames which together take the total volume of onshore disposal which is required. The position of the Port of London Authority (PLA) in approving dredging on the Thames is not typical of the UK but this site does illustrate how on-shore disposal can be beneficial both in terms of economics and conservation interests. lKm Cliffe Marshes (I Cliffe Disposal Site Hydrodynamic and Non-Dredging Solutions Paul Hesk, Business Development Manager, Van Oord UK, Newbury, UK Introduction Whereas the majority of Ports and Harbours around the world require some form of maintenance dredging, various factors can contribute to often make it an inefficient and therefore relatively costly operation.

The Nitrates Directive Nitrate Vulnerable Zones (NVZs) The implementation of the Nitrates Directive into UK law resulted in dredgings being defined as a Nitrogen fertiliser. When the NVZ Rules were revised in 2002, the area of England designated as an NVZ increased from 8% to 55%. Unfortunately for British Waterways, the bulk of their canal network is within the designated zone as can be seen in Figure 1. , ^v Nitrate Vulnerable Zones Figure 1. Nitrate Vulnerable Zones in England This definition of dredgings as a nitrogen fertiliser has had a serious impact on British Waterways, as it means that the application of dredgings to agricultural land must not exceed the annual crop requirement of fertiliser nitrogen.

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2nd International Conference on Maintenance Dredging by Institution of Civil Engineers

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