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Discussion

A coastal sediment budget accounts for

  • A.the money spent on coastal defence works
  • B.the total volume of water exchanged on each successive tidal cycle
  • C.the number of waves arriving in a year
  • D.sources, sinks and transport into and out of a control volume

Answer: D

A surplus builds the shoreline seaward while a deficit causes erosion. Quantifying each term is difficult, and the budget is often closed by treating the residual as the least certain term. Closure errors can be a large fraction of the total.

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