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  • Material Type Environmental Impact Assessment
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  • Publication Year 2000
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Guidelines for monitoring and evaluating beach erosion and shoreline dynamics: report of a training workshop Tarawa, Kiribati, 14-16 March 2000
Available Online

Maharaj Russel J

2000
The following is a transcript and a report of lectures/training delivered In Tarawa, Kiribati on Guidelines for Monitoring and Evaluating Beach Erosion and Shoreline Dynamics. The training/lectures are part of in-country training and capacity building on Coastal Processes. These lectures were delivered between 14-16 March 2000, at the Otintai Hotel, Tarawa, Kiribati. The lecture discussed the need for understanding beaches, beach dynamics and neashore processes within the framework of coastal hazards and risks. Erosion and erosion processes were discussed, as wells as the hydrodynamics aspects of nearshore environments. Engineering In the coastal zone was presented, within the framework of the coastal project cycle. Examples of coastal engineering projects were discussed, with reference to current port and harbour development. In south Tarawa and the Nippon Causeway. In addition, coastal protection structures were examined in the field and Issues related to the appropriateness of these were highlighted. Construction material used along the shorefront were discussed, In particular concrete and Its performance In coastal environments. Issues related to optimum coastal management and engineering were also discussed. A full list of up-to-date and state-of-the-art references on the subject is also given and is Included in this report.
The utilization of seawalls in response to shoreline erosion: consequences, socio-economic, political and legal forces, and alternatives
Biodiversity Conservation
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.
The state of marine resources of Helen reef in the year 2000: results of scientific and community monitoring surveys, April 24 to May 3, 2000 : final report
Biodiversity Conservation
Available Online

Birkeland Charles

2000
Helen Reef in the Southwest Islands of Palau is the one of the greatest marine assets of the Hatohobei (Tobi) People and of the Republic of Palau. Helen Reef is known as one of the most biologically diverse coral reef atolls in the Pacific and historically one of the most biologically abundant reefs in Palau,including acclaimed populations of plentiful marine resources including, trochus, turtles, sea cucumbers, seabirds, and many large reef fish. Reflected in its traditional Hatohobeian name Hotsarihie, which signifies “Reef of the Giant Clam”, Helen Reef is perhaps most famous in the region for its once ubiquitous giant clams, and unfortunately the unchecked foreign poaching that has occurred there over the past decades. The richness and abundance of the atoll’s resources are factors of its location, being remote from human populations and bordering the biodiverse marine eco-regions of Melanesia and SE Asia. The cumulative characteristics of the atoll have attracted many users over time including subsistence fishers from Hatohobei and neighboring islands, sea-faring traders, local businesses interests, and foreign commercial resource operations. The remoteness of Helen Reef which contributes to its historical levels of resource abundance is also a underlying cause for recent resource declines, as the atoll is usually uninhabited and has been notably vulnerable to poaching for the last half century by foreign fishermen from Asian countries
Benthic ecology and biota of Tarawa, Atoll lagoon: influence of Equatorial upwelling, circulation, and human harvest
Biodiversity Conservation
Available Online

Paulay Gustav

2000
The lagoon of Tarawa harbors the richest benthos documented for any Pacific atoll. The biota is strongly influenced by its setting in the equatorial upwelling zone and the unusual geomorphology of the atoll, with a submerged western rim, but largely closed and islet-strewn eastern and southern sides. As the metropolitan center of the Republic of Kiribati, Tarawa also has the largest human population of any Pacific atoll. These three attributes impose a strong influence on all aspects of the lagoon. The high regional productivity supports unusually high population densities of heterotrophic mollusks and irregular echinoids for an "open" atoll. The dense human population on the atoll relics largely on marine resources for its protein needs. The lagoonal sand flat harbors dense and diverse mollusk communities, particularly in seagrass beds. These communities support an intensive subsistence fishery with an annual harvest of ca. 1,000 tons in South Tarawa. Much of the available biomass of the two preferred species, the blood cockle Anadara uropigimelana (te bun) and the small conch Strombus luhuanus (te nouo), is taken. Both the seagrass and shellfish beds appear to have expanded considerably in the past 50 years, likely as a result of nutrient enrichment from the rapidly growing human population. Dense mollusk communities along the southeastern lagoon slope at 2-8 m depth support an intensive commercial fishery that harvests approximately 1,000 tons of Anadara per year, again representing much of the available production. Three species of irregular echinoids are conspicuously abundant on the floor of the eastern lagoon, with combined densities > 100 m-2 in the muddy facies of the inner lagoon. All aspects of the benthos follow a marked west-to-east and north-to-south zonation, reflecting the one-sided exchange of oceanic waters along the western atoll rim. While mollusk and echinoid biomass increases southeastward, coral diversity and cover decreases in that direction.