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Extra resources for BRITISH STANDARD 6349-1:2000, Code of practice for maritime structure, Part 1: Code of practice for general criteria

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1 General In any operation involving the alteration of the inshore hydrodynamic regime, the subsequent effects on sediment movement have to be considered. It is in the inshore zone that energy generated at sea is transmitted to the land in the form of waves, tidal currents, etc. and it is the sediments, rocks and man-made structures of the area that are responsible for attenuating this energy. The sediment of the littoral and sublittoral zones is moulded into a topography and, as long as the balance of forces is maintained, the system will be in dynamic equilibrium.

0 m/s have been reported and it is noteworthy that they are the only currents easily capable of transporting sediment seawards. At present it is not possible to predict the strength or spacing of rip currents and there is insufficient information to indicate quantitatively how important they are as sediment transporting agents in the context of net movement. 1 General Whilst these techniques give an estimate of the rate and direction of sediment transport in an area, in many engineering problems it is necessary to produce an estimate of the amount of accretion or scour.

In a preliminary beach inspection, features such as spits and accretion or scour against existing structures are indicative of the direction of the drift and intensity of sediment transport. Care should be taken to avoid being misled by seasonal or short-term effects. 1 General When the current flows over a bed of erodible sediment, a certain minimum current is required to initiate movement. 0 mm) has been found to be greater. e. e. suspended transport. For fine-grained sediments, both modes are usually present at the same time and it is difficult to distinguish the boundary and the level at which suspended transport is initiated.

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