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| Titel |
Determination of spatially varying Van der Burgh's coefficient from estuarine parameter to describe salt transport in an estuary |
| VerfasserIn |
D. C. Shaha, Y.-K. Cho |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 5 ; Nr. 15, no. 5 (2011-05-02), S.1369-1377 |
| Datensatznummer |
250012774
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| Publikation (Nr.) |
 copernicus.org/hess-15-1369-2011.pdf |
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| Zusammenfassung |
| The estuarine parameter v is widely accepted as describing the relative
contribution of the tide-driven and density-driven mixing mechanism of salt
transport in estuaries. Van der Burgh's coefficient K is another parameter
that also determines the relative strength of two mechanisms. However, a
single value of K, which has been considered in previous studies, can not
represent the spatial variation of these mechanisms in an estuary. In this
study, the spatially varying K has been determined from the v value calculated
using intensively observed longitudinal salinity transects of the Sumjin
River Estuary with exponential shape. The spatially varying K describes the
spatial variation of these mechanisms reasonably well and is independent of
the river discharge downstream of the estuary where the strong tides cause
well mixed conditions. However, K values increase upstream and are found to
depend on the freshwater discharge, with suppressing vertical mixing. The
K value has been scaled on the basis of the v value and ranges between 0 and
1. If K < 0.3, the up-estuary salt transport is entirely dominated by
tide-driven mixing near the mouth. If 0.3 < K < 0.8, both tide-driven and
density-driven mixing contribute to transporting salt in the central
regimes. If K > 0.8, the salt transport is almost entirely by
density-driven circulation in the upper most regimes. In addition, another
K-based dispersion equation has been solved by using this spatially varying
K. The spatially varying K demonstrates density-driven circulation more
prominently at the location of strong salinity gradient compared with a
single K value. |
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