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(A) Photograph of a flood-tidal delta. Note the delta shape. The ocean is to the bottom and lagoons are toward the top of the picture. Land is also in that direction. The flood-tidal current apparently is strong enough to transport sediment through the tidal channel and into the landward lagoon. (B) Photograph showing a beach, lagoon, and ebb-tidal channel. Ebb tidal deltas form when the outgoing tides are sufficiently strong to transport sand seaward, beyond the beach. Both types of tidal deltas can form good but small reservoirs. (C) Block diagram of a barrier island system, which is discussed in the text.
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