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| Titel |
Revised predictive equations for salt intrusion modelling in estuaries |
| VerfasserIn |
J. I. A. Gisen, H. H. G. Savenije, R. C. Nijzink |
| 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 ; 19, no. 6 ; Nr. 19, no. 6 (2015-06-18), S.2791-2803 |
| Datensatznummer |
250120743
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| Publikation (Nr.) |
 copernicus.org/hess-19-2791-2015.pdf |
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| Zusammenfassung |
| For one-dimensional salt intrusion models to be predictive, we need
predictive equations to link model parameters to observable
hydraulic and geometric variables. The one-dimensional model of
Savenije (1993b) made use of predictive equations for the Van
der Burgh coefficient $K$ and the dispersion at the seaward boundary
D0. Here we have improved these equations by using an expanded
database, including new previously un-surveyed
estuaries. Furthermore, we derived a revised predictive equation for
the dispersion at tidal average condition and with the boundary
situated at the well identifiable inflection point where the estuary
changes from wave-dominated to tide-dominated geometry. We used 89
salinity profiles in 30 estuaries (including seven recently studied
estuaries in Malaysia), and empirically derived a range of equations
using various combinations of dimensionless parameters. We split our
data in two separated data sets: (1) with more reliable data for
calibration, and (2) with less reliable data for validation. The
dimensionless parameters that gave the best performance depended on
the geometry, tidal strength, friction and the Richardson
number. The limitation of the equations is that the friction is
generally unknown. In order to overcome this problem, a coupling has
been made with the analytical hydraulic model of
Cai et al. (2012), which makes use of observed tidal damping and
by which the friction can be determined. |
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