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| Titel |
Analytical approach for predicting fresh water discharge in an estuary based on tidal water level observations |
| VerfasserIn |
H. Cai, H. H. G. Savenije, C. Jiang |
| 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 ; 18, no. 10 ; Nr. 18, no. 10 (2014-10-17), S.4153-4168 |
| Datensatznummer |
250120502
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| Publikation (Nr.) |
 copernicus.org/hess-18-4153-2014.pdf |
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| Zusammenfassung |
| As the tidal wave propagates into an estuary, the tidally averaged water
level tends to rise in landward direction due to the density difference
between saline and fresh water and the asymmetry of the friction. The effect
of friction on the residual slope is even more remarkable when accounting for
fresh water discharge. In this study, we investigate the influence of river
discharge on tidal wave propagation in the Yangtze estuary with specific
attention to residual water level slope. This is done by using a
one-dimensional analytical model for tidal hydrodynamics accounting for the
residual water level. We demonstrate the importance of the residual slope on
tidal dynamics and use it to improve the prediction of the tidal propagation
in estuaries (i.e. tidal damping, velocity amplitude, wave celerity and phase
lag), especially when the influence of river discharge is significant.
Finally, we develop a new inverse analytical approach for estimating fresh
water discharge on the basis of tidal water level observations along the
estuary, which can be used as a tool to obtain information on the river
discharge that is otherwise difficult to measure in the tidal region. |
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