Download e-book for iPad: 2nd International Conference on Maintenance Dredging by Institution of Civil Engineers

By Institution of Civil Engineers

ISBN-10: 0727732889

ISBN-13: 9780727732880

This quantity provides the complaints of the 2d foreign convention on upkeep Dredging in may perhaps 2004. the aim of the convention used to be to supply a entire replace on all elements of upkeep dredging together with rules, dredging equipment, dredged fabric therapy and helpful use, agreement administration, and environmental influence overview and mitigation

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Extra resources for 2nd International Conference on Maintenance Dredging

Sample text

Increases in deep draughted vessel passages may be keeping more material in suspension and fresh water inputs may have altered the balance in the harbour. There can be a variety of reasons for maintenance dredging requirements to change and there have been industry examples of ports which found they could dramatically reduce their maintenance dredging commitment with little impact on accretion levels or navigational access. Other means of reducing the volumes removed could include reviewing the need for full under keel clearances (UKC) within a sheltered harbour or channel, or in areas where vessels would be manoeuvring at slow speeds.

The Rapid Assessment Tool is capable of calculating these variable profiles. g. ). The output consists of two graphs, the fluid mud layer thickness at several moments in time and the production rate as a function of the distance from the location of dredging operations. HESK 43 The upper graph predicts the behaviour of the density layer both as functions of distance along the channel from the dredging operation and time. Figure 4 shows that the density layer increases in thickness the further it gets from the dredging site (mainly from erosion and deposition from the underlying and overlying layers respectively) but reduces, as would be expected, over time.

British Waterways have been in discussion with the Environment Agency and Defra to try and persuade them that dredgings should not be defined 26 MAINTENANCE DREDGING II as a nitrogen fertiliser and for them to consider a more scientific approach for the spreading of dredgings to agricultural land. The current guidelines have been arrived at without an understanding of how the nitrogen in dredgings reacts when removed from a watercourse and spread on land. It has now been agreed that trials should take place to provide evidence of what happens when dredgings are spread to land.

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


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