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  • Collection Island and Ocean Ecosystems
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The utilization of seawalls in response to shoreline erosion: consequences, socio-economic, political and legal forces, and alternatives
Island and Ocean Ecosystems
Available Online

Kelly Shawn W

2000
When coastal buildings or roads are threatened, the typical response is to harden the coast with a seawall. Seawalls run parallel to the beach and can be built of concrete, wood, steel, or boulders. Seawalls are also called bulkheads or revetments; the distinction is mainly a matter of purpose. They are designed to halt shoreline erosion caused primarily by wave action. If seawalls are maintained, they may temporarily hold back the ocean from encroaching on shoreline development. In spite of their ability to hold back the ocean, when waves hit a seawall, the waves are reflected back out to sea, taking beach sand with them and eventually causing the beach to disappear. Moreover, seawalls can cause increased erosion at the ends of the seawall on an adjacent beach that is not walled. Alternatives to seawalls exist, such as beach nourishment and managed retreat. Making coastal land use decisions that ensure a seawall will not be needed in the future to protect structures, however, is the most prudent coastal management solution. This can be accomplished by establishing setback lines and conducting managed retreat of structures that are threatened by shoreline erosion before the situation worsens, or structures that have the potential for being threatened in the future. Regional case studies are presented to illustrate.
Status of coral reefs in the South West Pacific: Fiji, Nauru, New Caledonia, Samoa, Solomon Islands, Tuvalu and Vanuatu
Island and Ocean Ecosystems
Available Online

Lovell, Edward et al.

Coral reefs in the Southwest Pacific are generally in good condition. There was extensive coral bleaching during 2000-2002. Since then coral reefs have shown highly variable recovery with some reefs recovering fully to pre-bleaching levels of live coral cover, whereas others have shown virtually no recovery. Nauru experienced coral bleaching and mass fish kills in October-December 2003, possibly due to unusually high sea surface temperatures. The greatest threats to coral reefs of the region continue to be human activities and cyclones, with reefs of New Caledonia, Samoa, Solomon Islands and Vanuatu having been damaged by cyclones since the 2002 status report. Cyclone Erica in 2003 destroyed 10-80% of live coral cover on New Caledonia. Cyclone Heta struck Samoa in 2004, damaging 13% of the coral reefs, and in mid-2004 an unprecedented number of seabirds were found dead on Nauru; the cause is unknown. The momentum in the protection and conservation of coral reefs in the region has been boosted by increased participation of governments, NGOs, scientists, volunteers and local communities, especially in the implementation of resource management strategies to mitigate human pressure. A series of damaging bleaching, crown-of-thorns starfish, disease and cyclone events in the past 10 years has generated a greater awareness of the need to conserve coral reefs. The SW Pacific Node has established an important network and conducted training, which will contribute greatly to coral reef management in the Pacific. However, these initial investments and initiatives could be seriously compromised after 2004 without ongoing financial support for coordination and monitoring. Monitoring surveys are only useful if they are conducted on a regular basis and tied to relevant issues such as over-fishing, MPA establishment and coral reef management. This report summarises the status of coral reefs of the SW Pacific region and has been compiled from the national reports of the 7 member countries.