Coastal Lagoon Processes by Bjorn Kjerfve

By Bjorn Kjerfve

It is a broad-based assessment of the environmental, oceanographic, engineering, and administration facets of coastal lagoons summarized in a handy unmarried quantity. A entire literature evaluation, in addition to references upload to the software of this quantity, developing a useful source for lecturers, scientists, and laymen.

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2). At Orbetello, on the west coast of Italy, a lagoon has been enclosed between the twin barriers that form a double tombolo, attaching a former island to the mainland (Sacchi, 1979). The largest and most complicated lagoon systems are found where broad embayments have been sealed E. F. Bird 11 Fig. 1. The Coorong, in South Australia, is a long narrow lagoon, cut off from Encounter Bay by a sandy barrier. Dunes mobilized after the clearing and burning of the native vegetation cover are spilling over into the lagoon.

7. Ringkobing Fiord, a lagoon on the west coast of Jutland, Denmark. Had a natural outlet which migrated southward. An artificial canal has been cut through the enclosing barrier at Hvide Sande. 24 Physical Setting and Geomorphology of Coastal Lagoons first enclosed by a spit prolonged across the mouth of a n embayment, which was then widened by accretion of sand on the seaward side. This became a n inner barrier when a chain of barrier islands which subsequently formed a mile or so offshore were linked to form a n outer barrier, backed by a long, narrow lagoon (Lake Reeve), and bordered on the seaward side by the Ninety Mile Beach (Bird, 1978).

This sequence is well known on the Zululand coast, where most lagoons are sealed off by sand deposition in the relatively dry winter season (May through August) and entrances are reopened in the summer when rains in the hinterland increase fluvial discharge into the lagoons until t4e water spills over into the sea. In south-eastern Australia lagoon entrances are usually reduced in size or sealed off altogether in dry summer periods, then reopened or enlarged in the wetter winters. When a barred entrance has persisted for several seasons, local people may artificially reopen it by digging an outflow channel, which widens and deepens as the head of water disperses.

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