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Freshwater Lens Recharge at Boniriki, Kiribati (1996)

Knowledge of the recharge of the fresh groundwater lenses of small, low-lying islands in the humid tropics is essential in managing the sustainable extraction of potable water.

This document* pays particular attention to total evapotranspiration from coconut trees. Concerning the water balance of shallow basal aquifers, it is the least well-characterized. Moreover, coconut trees present a management conflict as they can be used for a variety of products but potentially consume limited potable groundwater. It is suggested that equilibrium evaporation is the most appropriate upper limit for both short- and long-term water balances of small coral islands. The document also reviews techniques of direct evapotranspiration measurement, but places doubt on the value of all of them because of advective effects from nearby oceans. The only exceptions are the possible use of tracers and stable isotopes, and scintillometry. Another conclusion is that time domain reflectrometry to measure the diurnal changes in soil water content linked with a simple soil water balance model is one of the best approaches to infer total evaporation losses.

Start date 04-10-2005 11:37 am
End Date 04-10-2005 11:37 am
Website (url) *White, I. 1966. Freshwater Groundwater Lens Recharge at Boniriki, Kiribati. Preliminary Report. IHP-V Technical Documents in Hydrology No. 5. UNESCO, Paris.

 
 
 
 
 

 

 

 

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