Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 16, 41-54, 2016
https://doi.org/10.5194/nhess-16-41-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
18 Jan 2016
Transport and bottom accumulation of fine river sediments under typhoon conditions and associated submarine landslides: case study of the Peinan River, Taiwan
A. A. Osadchiev1, K. A. Korotenko1, P. O. Zavialov1, W.-S. Chiang2, and C.-C. Liu2 1P. P. Shirshov Oceanology Institute, Moscow, Russia
2Tainan Hydraulics Laboratory, National Cheng-Kung University, Tainan, Taiwan
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.

Citation: Osadchiev, A. A., Korotenko, K. A., Zavialov, P. O., Chiang, W.-S., and Liu, C.-C.: Transport and bottom accumulation of fine river sediments under typhoon conditions and associated submarine landslides: case study of the Peinan River, Taiwan, Nat. Hazards Earth Syst. Sci., 16, 41-54, https://doi.org/10.5194/nhess-16-41-2016, 2016.

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Short summary
This research was motivated by damage of underwater cables and pipelines caused by turbidity flows which regularly take place along the eastern coast of Taiwan. Elevated discharge of terrigenous sediments during typhoons and their subsequent settling on the steep sea floor can cause submarine landslides which induce such turbidity flows. In this article we simulated the fate of sediments discharged from the Peinan River and identified areas which exhibit a high risk of turbidity flows.
This research was motivated by damage of underwater cables and pipelines caused by turbidity...
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