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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Numerical simulations of lagoonal flow field and pollutant advection in funafuti atoll, tuvalu
Numerical simulations of lagoonal flow field and pollutant advection in funafuti atoll, tuvalu
Author : DAISAKU SATO(1), HIROMUNE YOKOKI(2) & MASAMITSU ARITA(3)
ion due to insufficient effluent treatment of domestic wastewater is concerned in the enclosed lagoon of
Funafuti atoll, Tuvalu. However, the fundamental characteristics of water flow field in the lagoon are not understood
enough. This study conducted the numerical simulations of the lagoonal flow field and virtual particles advection in order to
estimate the characteristics of water flow field and water contamination condition in the lagoon of Funafuti Atoll.
Comparison of the calculated current velocity and water surface elevation and the observed data showed good agreement.
The calculated lagoonal flow field showed that dominant currents were driven by wind and dominantly towards east to west.
On the shallow reef-flat the high speed orbital currents were generated by tide. However the orbital currents influenced the
limited area near the open reef-flat. In the nearshore zone of the Fongafale Island the flow velocity was low through a year.
Numerical simulation of virtual particles advection indicated that the particles, which were installed in the nearshore of
Fongafare Island, were transported to the west side of the atoll through a year. In the non-trade-wind season, the high
retention of installed particles was calculated in the lagoon. The simulated result provides important information for
lagoonal environment conservation because the west side of the atoll is established as the preservation area by Tuvalu.Form Required :
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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