| Autor: |
Paterson, Adam, Hume, Terry, Healy, Terry |
| Předmět: |
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| Zdroj: |
Journal of Coastal Research; 2000 Special Issue, p288-294, 7p |
| Abstrakt: |
Rivers discharging into the Canterbury Bight, New Zealand, are impounded by barriers formed by sand and gravel sediment moving along the coast. This creates elongated lagoon features, known locally as hapua. The lagoon discharges to the sea through an ephemeral and highly mobile drainage channel. Analysis of hourly images from a computerised video camera overlooking the hapua and drainage channel for 18 months through 1998-9 suggested that existing theories describing discharge channel migration and behaviour are incomplete. The seaward and lagoon ends of the channel migrate differently in a cyclic but irregular pattern. The influence of persistent morphological features, in the form of raised berms on the barrier, cause a stepping migration pattern at the lagoon end of the drainage channel. In contrast, the seaward end of the drainage channel moves more rapidly and in a more regular manner in response to wave driven longshore transport to the north. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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