Estimating the freshwater-lens thickness of atoll islands in the Federated States of Micronesia

Bailey, R. T.; Jenson, John W.; Taboroši, D.

Estimating the freshwater-lens thickness of atoll islands in the Federated States of Micronesia | Estimation de l’épaisseur des lentille d’eau douce des îles-atoll des États fédérés de Micronésie Estimación del espesor de las lentes de agua dulce de las islas atolones en los Estados Federados de Micronesia 对密克罗尼西亚联邦的环礁岛上淡水透镜体厚度的估算 Estimação da espessura da lente de água doce nas ilhas atol dos Estados Federados da Micronésia

2013

Bailey, R. T. | Jenson, John W. | Taboroši, D.

The water resources of the 32 atolls of the Federated States of Micronesia (FSM) are under continual threat from El Niño-induced droughts and other natural hazards. With government policies emphasizing sustainable development of atoll-island communities, local managers are in need of tools for predicting changes in the availability of fresh groundwater, which communities depend upon during droughts that incapacitate rain-catchment systems. An application of a recently developed, readily portable algebraic model is demonstrated here, to estimate the freshwater-lens thickness of atoll islands in the FSM, a key component of FSM groundwater resource assessment. Specifically, the model provides estimates of the lens thickness of atoll islands in the FSM during normal and drought conditions. The model was tested for use in the FSM through comparison with available lens data under both average rainfall conditions and intense drought conditions, and then applied to major islands of each atoll within the FSM. Results indicate that out of 105 major islands on FSM atolls, only six would likely retain sufficient groundwater to sustain the local community during an intense drought.

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