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Numerical Modeling of Wave-and Curre...

Haddadian, Sahar.

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Numerical Modeling of Wave-and Current-Supported Turbidity Currents Over Erodible Bed.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Numerical Modeling of Wave-and Current-Supported Turbidity Currents Over Erodible Bed./
Author:	Haddadian, Sahar.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	178 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-11, Section: B.
Contained By:	Dissertations Abstracts International83-11B.
Subject:	Gravity. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29113885
ISBN:	9798426898950

Numerical Modeling of Wave-and Current-Supported Turbidity Currents Over Erodible Bed.
Haddadian, Sahar.

Numerical Modeling of Wave-and Current-Supported Turbidity Currents Over Erodible Bed. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 178 p.

Source: Dissertations Abstracts International, Volume: 83-11, Section: B.

Thesis (Ph.D.)--Louisiana State University and Agricultural & Mechanical College, 2020.

The physical processes that route sediments from nearshore to the continental margin provide vital information to the global assessment of the geochemically important matter and the life in the ocean. Therefore, understanding these processes at the fundamental level will help develop accurate models that can be integrated into operational ocean models. Wave- and current-supported turbidity currents (WCSTCs) are one of the mechanisms that deliver sediments to the continental margin. WCSTCs are slow-moving turbidity currents where near-bed turbulence driven by strong surface waves and/or currents, tide- and/or wind-driven, maintain the turbidity current in motion. This study investigates the along-shelf current-supported turbidity currents (ACSTCs) over an erodible bed, where only the along-shelf current drives the flow, and sediment suspension is sourced from the ephemeral fine sediment deposits. To mimic ACSTCs, direct numerical simulations of a flow in a steady, turbulent, sediment-laden channel with a mild spanwise slope were conducted over an erodible bed. The primary focus of this study is to determine the effect of various sediment settling velocity, erosion parameters, and associated sediment-induced density stratification on total suspended sediment concentration, velocity structure, and turbulent characteristics of the ACSTCs. Specifically, this study aims to analytically and numerically investigates the transition of alongshore current-supported turbidity currents to self-sustaining turbidity currents over erodible seabed composed of fine sediment. Thus, a simplified depth-integrated dynamic equation is developed for suspended sediment concentration. The stability of the developed equation is analyzed both in itself and through temporal linear stability analysis. The analyses find two criteria for the inception of the aforementioned transition. Both criteria indicate that transition is found to reflect the competition between erosion flux, enhanced by the cross-shelf motion of alongshore current-supported turbidity currents, and the deposition flux. In addition, drag coefficient associated with cross-shelf motion of ACSTCs is formulated as a function of the Reynolds number, sediment concentration, sediment settling velocity, and the bed slope.

ISBN: 9798426898950Subjects--Topical Terms:

535300
Gravity.

Numerical Modeling of Wave-and Current-Supported Turbidity Currents Over Erodible Bed.
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245 1 0 $a Numerical Modeling of Wave-and Current-Supported Turbidity Currents Over Erodible Bed.
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300 $a 178 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-11, Section: B.
500 $a Advisor: Ozdemir, Celalettin Emre.
502 $a Thesis (Ph.D.)--Louisiana State University and Agricultural & Mechanical College, 2020.
520 $a The physical processes that route sediments from nearshore to the continental margin provide vital information to the global assessment of the geochemically important matter and the life in the ocean. Therefore, understanding these processes at the fundamental level will help develop accurate models that can be integrated into operational ocean models. Wave- and current-supported turbidity currents (WCSTCs) are one of the mechanisms that deliver sediments to the continental margin. WCSTCs are slow-moving turbidity currents where near-bed turbulence driven by strong surface waves and/or currents, tide- and/or wind-driven, maintain the turbidity current in motion. This study investigates the along-shelf current-supported turbidity currents (ACSTCs) over an erodible bed, where only the along-shelf current drives the flow, and sediment suspension is sourced from the ephemeral fine sediment deposits. To mimic ACSTCs, direct numerical simulations of a flow in a steady, turbulent, sediment-laden channel with a mild spanwise slope were conducted over an erodible bed. The primary focus of this study is to determine the effect of various sediment settling velocity, erosion parameters, and associated sediment-induced density stratification on total suspended sediment concentration, velocity structure, and turbulent characteristics of the ACSTCs. Specifically, this study aims to analytically and numerically investigates the transition of alongshore current-supported turbidity currents to self-sustaining turbidity currents over erodible seabed composed of fine sediment. Thus, a simplified depth-integrated dynamic equation is developed for suspended sediment concentration. The stability of the developed equation is analyzed both in itself and through temporal linear stability analysis. The analyses find two criteria for the inception of the aforementioned transition. Both criteria indicate that transition is found to reflect the competition between erosion flux, enhanced by the cross-shelf motion of alongshore current-supported turbidity currents, and the deposition flux. In addition, drag coefficient associated with cross-shelf motion of ACSTCs is formulated as a function of the Reynolds number, sediment concentration, sediment settling velocity, and the bed slope.
590 $a School code: 0107.
650 4 $a Gravity. $3 535300
650 4 $a Viscosity. $3 1050706
650 4 $a Scale models. $3 3683930
650 4 $a Fourier transforms. $3 3545926
650 4 $a Soil erosion. $3 602940
650 4 $a Sediment transport. $3 555890
650 4 $a Offshore. $3 3681420
650 4 $a Reynolds number. $3 3681436
650 4 $a Boundary conditions. $3 3560411
650 4 $a Density. $3 3561164
650 4 $a Shear stress. $3 3681838
650 4 $a Fluid mechanics. $3 528155
650 4 $a Mathematics. $3 515831
650 4 $a Mechanics. $3 525881
650 4 $a Physics. $3 516296
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710 2 $a Louisiana State University and Agricultural & Mechanical College. $3 783779
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