 |
| Titel |
Effects of bottom topography on dynamics of river discharges in tidal regions: case study of twin plumes in Taiwan Strait |
| VerfasserIn |
K. A. Korotenko, A. A. Osadchiev, P. O. Zavialov, R.-C. Kao, C.-F. Ding |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1812-0784
|
| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 5 ; Nr. 10, no. 5 (2014-10-30), S.863-879 |
| Datensatznummer |
250117072
|
| Publikation (Nr.) |
 copernicus.org/os-10-863-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Princeton Ocean Model (POM) is used to investigate the intratidal variability
of currents and turbulent mixing and their impact on the characteristics and
evolution of the plumes of two neighbouring rivers, the Zhuoshui River and
the Wu River, at the central eastern coast of Taiwan Strait. The two
estuaries are located close to each other and their conditions are similar
in many respects, and yet the two plumes exhibit significantly different
behaviour. We explain this through differences of the bottom topography in
the areas adjacent to the two river mouths. The Zhuoshui River runs into a
shallow area that is permanently exposed to strong tidal mixing, while the
Wu River mouth is located in a deeper, stratified area outside the region of
intense mixing. This destruction of the plume by tidal mixing is confirmed
by the results of numerical modeling with POM. The spatial and temporal
variability of turbulent kinetic energy, the rates of its production by
shear and destruction rate by buoyancy in the study, as well as the
horizontal diffusivity, are analysed with the emphasis given to the
dependence of the turbulence parameters on the bottom topography on the one
hand and their influence on the river plumes on the other. The results of
the study support the central hypothesis of this paper: the dynamic
behaviours of the Zhuoshui and Wu plumes are different because their
evolution occurs under different regimes of bottom-generated turbulent
mixing.
Further, we use a Lagrangian particle tracking model in combination with POM
to investigate the effect of the tidal wetting-and-drying (WAD) near the
Zhuoshui River estuary, and demonstrate that WAD leads to significant
reduction of the plume extent and surface salinity deficit near the river
mouth. We use observational data from a short field campaign in the study
area to tune and validate the model experiments. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|