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Shore protection in the Republic of the Marshall Islands : pilot project report
Biodiversity Conservation
Available Online

Goreau, Thomas J

,

Hagberg, Erik

,

Jormelu, Katwel

2010
Wind, Wave, and Solar powered shore protection and coral reef restoration projects were installed in the Marshall Islands in early 2010 by the Arno Kobamaron Community Base Organization, in collaboration with the Global Reef Alliance and Pacific Aquaculture Cooperatives, funded by the Federal Republic of Germany Federal Foreign Office Task Force for Humanitarian Aid. The projects were installed at Ine Village, Arno Atoll (Wind powered), Jabo Village, Arno Atoll (Wave powered), and Enemanit, Majuro Atoll, (Solar powered). Local community residents were trained in construction and installation skills. These projects will help restore near-shore coral reefs and fisheries habitat, protecting beaches from wave erosion and allowing them to grow. A tidal current project was originally also planned but unfortunately could not be installed during the project period due to delays by the manufacturer. The results of these pilot demonstration projects dramatically demonstrate that local communities can use their own vast and untapped sources of sustainable energy to grow back their coral reef and fisheries resources and protect their islands from erosion by global sea level rise. There is a critically urgent need to replicate this example on a large scale in all low-lying island nations and coasts before global sea level rise accelerates.
The dynamic response of reef islands to sea level rise: evidence from multi-decadal analysis of island change in the central Pacific
Biodiversity Conservation
Available Online

Kench, Paul S.

,

Webb, Arthur P.

2010
Low-lying atoll islands are widely perceived to erode in response to measured and future sea level rise. Using historical aerial photography and satellite images this study presents the first quantitative analysis of physical changes in 27 atoll islands in the central Pacific over a 19 to 61 year period. This period of analysis corresponds with instrumental records that show a rate of sea level rise of 2.0 mm.y-1 in the Pacific. Results show that 86% of islands remained stable (43%) or increased in area (43%) over the timeframe of analysis. Largest decadal rates of increase in island area range between 0.1 to 5.6 hectares. Only 14% of study islands exhibited a net reduction in island area. Despite small net changes in area, islands exhibited larger gross changes. This was expressed as changes in the plan form configuration and position of islands on reef platforms. Modes of island change included: ocean shoreline displacement toward the lagoon; lagoon shoreline progradation; and, extension of the ends of elongate islands. Collectively these adjustments represent net lagoon ward migration of islands in 65% of cases. Results contradict existing paradigms of island response and have significant implications for the consideration of island stability under ongoing sea level rise in the central Pacific. First, islands are geomorphologically persistent features on atoll reef platforms and can increase in island area despite sea level change. Second; islands are dynamic landforms that undergo a range of physical adjustments in responses to changing boundary conditions, of which sea level is just one factor. Third, erosion of island shorelines must be reconsidered in the context of physical adjustments of the entire island shoreline as erosion may be balanced by progradation on other sectors of shorelines. Results indicate that the style and magnitude of geomorphic change will vary between islands. Therefore, Island nations must place a high priority on resolving the precise styles and rates of change that will occur over the next century and reconsider the implications for adaption.