Tidal current choking in the landlocked fjord of NordÅsyatnet

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Abstract
Due to heavy pollutional loading of the landlocked fjord Nordåsvatnet, situated south of Bergen, the interchange of water through the narrow canal between Nordåsvatnet and the open fjord, has been surveyed. Tidal heights were measured outside Straume and at three different locations in the landlocked fjord. Hydraulic information about Straume canal were made available by means of velocity measurements over a tidal period. A mathematical formulation of the interchange process, supplied with constants from the observational data was fitted on to an analog computer. In this way canal velocity, canal flow and tidal elevation in Nordåsvatnet were calculated for a varying canal area.

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