By Eric Bird, Nick Lewis
Beach renourishment is the recovery of shores which were depleted. The textual content offers with the assets of seashore sediment in addition to the explanations and average responses to seashore erosion, ahead of dialogue of seashore renourishment.
Some of the 1st documented renourishment tasks have been undertaken within the early 1900’s at the east coast of the USA. a number of nations have on account that renourished seashores, quite up to now few many years. such a lot tasks were within the usa, the uk, a few ecu nations and Australia. those are reviewed and event from a number of seashore renourishment initiatives used for dialogue of the subsequent topics:
1. the necessity for initial investigations
2. resources of sediment for seashore renourishment
3. tools of seashore renourishment
4. layout considerations
5. tracking adjustments after seashore renourishment
6. review of performance
7. Modelling of seashore renourishment
8. seashore renourishment for coast protection
9. Environmental impacts
10. expenditures and benefits
11. reaction of renourished shorelines to a emerging sea level
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Additional info for Beach Renourishment
Erosion on the cliff was largely due to gulleying and seepage, which was also delivering sand to the beach. 2a). 2b). In October 2011 contractors began dumping lorry-loads of sand brought from an inland quarry on the beach at Half Moon Bay. 1). 2 a Where waves arrive parallel to the coastline they produce a divergence of drift (arrowed) on a coastal salient (headland), so that a beach is not maintained there. b Where waves arrive at an angle to the coastline they produce longshore drift, so that a beach may persist round a coastal salient, maintained by sediment in transit 44 4 Beach Renourishment Principles beach that had been stable, in contrast with other nearby beaches that did need renourishment and about the colour of the dumped sand (yellow with an iron oxide stain: sand from the same quarry dumped on another Port Phillip Bay beach at Rye had quickly lost this stain by wave wash and rainfall) and its coarser texture (which is actually good management practice, see below).
A preliminary investigation should include: • The dimensions and morphology (with transverse profiles) of the beach and nearshore (including the breaker zone). • The relationship of the beach to nearby cliffs, bluffs, reefs, river mouths, tidal inlets and drains. © The Author(s) 2015 E. Bird and N. 1007/978-3-319-09728-2_4 41 42 4 Beach Renourishment Principles • Grain size (modal, range) and shape (rounded, angular): proportions of sand, granules, pebbles, cobbles, shells, rock fragments, alien particles (brick, glass, earthenware).
Royal HaskoningDHV 100 m long, and 50–200 m offshore, by stacking large boulders, usually of limestone or granite. 8). Waves break against them, and are diffracted through the intervening spaces before they reach the beach. 9). 8 Chain of boulder breakwaters protecting the beach on the coast at Rimini, Italy. 9 Tombolo formed in the lee of a breakwater on the coast of Singapore. © Geostudies It may be possible to use mobile, floating breakwaters, which can be anchored in the nearshore zone as a means of inducing beach accretion, then towed away to allow the accreted beach to be washed and nearshore water cleaned by wave action.