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The turbidity maximum in an estuary is

  • A.the location of maximum tidal range
  • B.the seaward limit of the estuary mouth
  • C.a zone of elevated suspended sediment near the salt intrusion limit
  • D.the point at which the water is at its clearest anywhere in the estuary

Answer: C

Flocculation and residual circulation together trap sediment in this zone. Its position migrates with the tide and with the river discharge. Its position is not fixed in space. Dredging strategy must account for that movement.

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