transport and bottom accumulation of fine river sediments under typhoon conditions and associated submarine landslides: case study of the peinan river, taiwan
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Abstract
A combination of a three-dimensional Eulerian ocean circulation model (Princeton ocean model, POM)
and a Lagrangian particle-tracking model (Surface-Trapped River Plume Evolution, STRiPE) is used to study the fate
of fine river sediments discharged by the Peinan River at the southeastern
coast of the island of Taiwan. The composite model is verified against in situ
measurements and applied to simulate primary sediment deposition under
freshet and typhoon discharge conditions of the Peinan River. It is shown
that local wind plays a crucial role in sediment transport and settling in
the coastal area through its influence on the river plume dynamics and
turbulent mixing in the upper layer. Wind forcing conditions generally
determine the location of the sediment deposit area, while its final pattern
is defined by coastal circulation as modulated by the geometry of the coast
and local bathymetry. In the study, region river-borne sediments are
deposited to the sea floor, mainly in the shallow shelf areas. A significant
portion of discharged fine sediments is moved offshore to the deeper ocean
where it is further advected and dispersed by strong coastal circulation,
mainly governed by the Kuroshio Current.
The performed numerical experiments showed that sediment accumulation rate
under typhoon conditions is about 2 orders of magnitude greater compared
to freshet conditions. Based on the simulation results, we identified areas
of continental shelf and continental slope adjacent to the Peinan River
estuary which exhibit a high risk of formation of submarine landslides during
and shortly after the typhoon events.
| Reference Key |
osadchiev2016naturaltransport
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|---|---|
| Authors | ;A. A. Osadchiev;K. A. Korotenko;P. O. Zavialov;W.-S. Chiang;C.-C. Liu |
| Journal | anziam journal |
| Year | 2016 |
| DOI |
10.5194/nhess-16-41-2016
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| URL | |
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