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WATER EXCHANGE AND DENSITY STRUCTURE IN A MULTIBASIN ESTUARY
SMHI, Research Department, Climate research - Rossby Centre.ORCID iD: 0000-0002-4971-9441
1992 (English)In: Continental Shelf Research, ISSN 0278-4343, E-ISSN 1873-6955, Vol. 12, no 9, 1003-1026 p.Article in journal (Refereed) Published
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Abstract [en]

A mathematical model of the Himmerfjard estuary. divided into four basins. has been formulated and validated against measured data for 1986. The structure of each sub-basin is assumed to be horizontally homogeneous with vertical mean velocities based upon in- and outflows from adjacent basins and freshwater supply to each basin. The horizontal water exchange is formulated as a quasi-stationary Bernioulli flow, driven by horizontal pressure gradients over the sounds and instantaneously interleaved at a neutral buoyancy level. Thc salinity and temperature profiles measured outside the mouth of the estuary serve as forcing, as do the water level changes, the freshwater run-off and the local wind. Inherent in the model assumptions of the horizontal exchange over the sounds is that only a fraction, alpha, of the pressure gradient is used to accelerate each stratum. Variation of the alpha-value shows that the best statistical fit is found for alpha = 0.15 when compared with water exchange estimates based on measurements in one of the internal sounds tor almost an entire month. Using this alpha-value, in combination with standard mixing parameters and hypsographical data, the model satisfactorily captures the major features of the salinity and temperature-profiles development for the year 1986. This is substantiated by statistical analysis of the salinity profiles in the sub-basins for which different measures of similarity between simulated and measured data give the best fit for the same alpha-value as above.

Place, publisher, year, edition, pages
SWEDISH METEOROL & HYDROL INST,S-60176 NORRKOPING,SWEDEN., 1992. Vol. 12, no 9, 1003-1026 p.
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Oceanography, Hydrology, Water Resources
Research subject
Oceanography
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URN: urn:nbn:se:smhi:diva-1702DOI: 10.1016/0278-4343(92)90013-AISI: A1992JG54700001OAI: oai:DiVA.org:smhi-1702DiVA: diva2:899728
Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-04-08Bibliographically approved

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