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| Titel |
Spatial variation of the longitudinal dispersion coefficient in an estuary |
| VerfasserIn |
D. C. Shaha, Y.-K. Cho, M.-T. Kwak, S. R. Kundu, K. T. Jung |
| 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. 12 ; Nr. 15, no. 12 (2011-12-07), S.3679-3688 |
| Datensatznummer |
250013049
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| Publikation (Nr.) |
 copernicus.org/hess-15-3679-2011.pdf |
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| Zusammenfassung |
| The effective longitudinal dispersion is a primary tool for determining
property distributions in estuaries. Most previous studies have examined the
longitudinal dispersion coefficient for the average tidal condition.
However, information on spatial and temporal variations of this coefficient
at low and high tides is scarce. Three years of hydrographic data taken at
low and high tide along the main axis of the Sumjin River Estuary (SRE),
Korea are used to estimate the spatial and temporal variation of the
effective longitudinal dispersion coefficient. The range of the dispersion
coefficient is rather broad at high water slack (HWS) and narrower at low
water slack (LWS) because of the different tidal amplitudes. The spatially
varying dispersion coefficient has maximal values (>300 m2 s−1)
near the mouth at high water and decreases gradually upstream, with
fluctuations. The temporally varying dispersion coefficient appears to be
positively correlated with river discharges at both low and high tide. The
dispersion varies with the square root of river discharges at HWS and LWS.
The dispersive salt fluxes increases with increasing river discharges and
decreases with decreasing river discharges at HWS and LWS. Estimation of the
numerical values of the effective longitudinal dispersion coefficient in the
SRE can be useful for better understanding of the distributions of other
tracers in the SRE as well as for developing and testing hypotheses about
various mixing mechanisms. |
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