Lagrangian model of a surface-advected river plume

Osadchiev, Alexander; Zavialov, Peter

doi:10.1016/j.csr.2013.03.010

Cited by 48 publications

(27 citation statements)

References 60 publications

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“…The main advantage of STRiPE lies in its ability to provide realistic results at relatively low computational cost compared to Eulerian models. STRiPE was applied for studying plumes formed by small-and medium-size rivers of RCBS by Osadchiev and Zavialov (2013) and Osadchiev (2015).…”

Section: Stripe Modelmentioning

confidence: 99%

Small river plumes off the northeastern coast of the Black Sea under average climatic and flooding discharge conditions

Osadchiev

Korshenko

2017

Ocean Sci.

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Abstract. This study focuses on the impact of discharges of small rivers on the delivery and fate of fluvial water and suspended matter at the northeastern part of the Black Sea under different local precipitation conditions. Several dozens of mountainous rivers flow into the sea at the study region, and most of them, except for several of the largest, have little annual runoff and affect adjacent coastal waters to a limited extent under average climatic conditions. However, the discharges of these small rivers are characterized by a quick response to precipitation events and can significantly increase during and shortly after heavy rains, which are frequent in the considered area. The delivery and fate of fluvial water and terrigenous sediments at the study region, under average climatic and rain-induced flooding conditions, were explored and compared using in situ data, satellite imagery, and numerical modeling. It was shown that the point-source spread of continental discharge dominated by several large rivers under average climatic conditions can change to the linesource discharge from numerous small rivers situated along the coast in response to heavy rains. The intense line-source runoff of water and suspended sediments forms a geostrophic alongshore current of turbid and freshened water, which induces the intense transport of suspended and dissolved constituents discharged with river waters in a northwestern direction. This process significantly influences water quality and causes active sediment load at large segments of the narrow shelf at the northeastern part of the Black Sea compared to average climatic discharge conditions.

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Section: Stripe Modelmentioning

confidence: 99%

Small river plumes off the northeastern coast of the Black Sea under average climatic and flooding discharge conditions

Osadchiev

Korshenko

2017

Ocean Sci.

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“…To investigate the dynamics of the Zhuoshui River and Wu River plumes, hereinafter we use two numerical models: namely, the well-known a finite difference, σ -coordinate Princeton Ocean Model (POM), and the recently developed Lagrangian model STRiPE (Osadchiev and Zavialov, 2013). The two models complement each other for simulating the complex dynamics of the plume.…”

Section: Modelsmentioning

confidence: 99%

“…Detailed description of the STRiPE model, as well as its validation and examples of its application to river plumes, are given in Osadchiev and Zavialov (2013). The STRiPE model tracks the motion of river water "particles" discharged into the sea.…”

Section: Implementing the Stripe Modelmentioning

confidence: 99%

Effects of bottom topography on dynamics of river discharges in tidal regions: case study of twin plumes in Taiwan Strait

et al. 2014

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Abstract. 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.

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“…The detailed description of the STRiPE is given in Osadchiev and Zavialov (2013). This model coupled with POM was recently used to study dynamical features of the Zhuoshui and Wu river plumes located on the western part of the Taiwan coast (Korotenko et al, 2014).…”

Section: Stripe Modulementioning

confidence: 99%

“…STRiPE is a Lagrangian model developed for simulating river plumes under various forcing conditions (Osadchiev and Zavialov, 2013). It represents a river plume as a set of Lagrangian particles or homogeneous elementary water columns extending from the surface down to the boundary between the plume and the underlying sea water.…”

Section: Stripe Modulementioning

confidence: 99%

Transport and bottom accumulation of fine river sediments under typhoon conditions and associated submarine landslides: case study of the Peinan River, Taiwan

Osadchiev

Korotenko

Zavialov

et al. 2016

Nat. Hazards Earth Syst. Sci.

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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 riverborne 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.

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Lagrangian model of a surface-advected river plume

Cited by 48 publications

References 60 publications

Small river plumes off the northeastern coast of the Black Sea under average climatic and flooding discharge conditions

Small river plumes off the northeastern coast of the Black Sea under average climatic and flooding discharge conditions

Effects of bottom topography on dynamics of river discharges in tidal regions: case study of twin plumes in Taiwan Strait

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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