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Laboratory Study on Particle Size Ef...

Ikeda, Jin.

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Laboratory Study on Particle Size Effects on Constant-Volume Particle-Driven Gravity Currents.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Laboratory Study on Particle Size Effects on Constant-Volume Particle-Driven Gravity Currents./
作者:	Ikeda, Jin.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	133 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Contained By:	Dissertations Abstracts International80-12B.
標題:	Physical oceanography. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13857499
ISBN:	9781392180013

Laboratory Study on Particle Size Effects on Constant-Volume Particle-Driven Gravity Currents.
Ikeda, Jin.

Laboratory Study on Particle Size Effects on Constant-Volume Particle-Driven Gravity Currents. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 133 p.

Source: Dissertations Abstracts International, Volume: 80-12, Section: B.

Thesis (Ph.D.)--The University of Texas at San Antonio, 2019.

.

In this dissertation, particle size effects on propagation behavior, sediment deposition patterns and suspended sediment concentrations in constant-volume of particle-driven gravity currents were mainly investigated. The gravity currents were generated by a lock exchange in a two-dimensional tank, and the propagation behavior and particle characteristics of depositions and suspended sediments were investigated using various instruments and techniques such as image processing technique, filtration technique, a laser diffraction size analyzer, and an Acoustic Doppler velocimetry.The main finding of this study is that particle size and turbulence control the dynamics of the particle-driven gravity currents and the deposited and suspended sediment characteristics in these currents. In this study, two propagation phases were proposed based on turbulent Reynolds number ReL and particle settling behaviors. The critical turbulent Reynolds number ReLc was estimated to be the order of one (~ 2 in our estimates). The effects of particle size on the particle settling velocity were relatively small in the early propagation stage (we called the turbulent dominated settling (TDS) propagation phase) due to strong turbulent flow and were significant in the later propagation stage (we called the gravity dominated settling (GDS) propagation phase) because of decreasing turbulence effects. The vertical concentration profiles at the current head were nearly linear within the TDS phase and changed to an exponential profile during their propagation; especially, the concentration profile quickly decreased in large particles. In addition, horizontal particle sorting that is size grading of particles towards the flow direction was more significant rather than vertical particle sorting.

ISBN: 9781392180013Subjects--Topical Terms:

3168433
Physical oceanography.
Subjects--Index Terms:

Particle size distribution

Laboratory Study on Particle Size Effects on Constant-Volume Particle-Driven Gravity Currents.
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245 1 0 $a Laboratory Study on Particle Size Effects on Constant-Volume Particle-Driven Gravity Currents.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 133 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Testik, Firat Y.
502 $a Thesis (Ph.D.)--The University of Texas at San Antonio, 2019.
506 $a .
520 $a In this dissertation, particle size effects on propagation behavior, sediment deposition patterns and suspended sediment concentrations in constant-volume of particle-driven gravity currents were mainly investigated. The gravity currents were generated by a lock exchange in a two-dimensional tank, and the propagation behavior and particle characteristics of depositions and suspended sediments were investigated using various instruments and techniques such as image processing technique, filtration technique, a laser diffraction size analyzer, and an Acoustic Doppler velocimetry.The main finding of this study is that particle size and turbulence control the dynamics of the particle-driven gravity currents and the deposited and suspended sediment characteristics in these currents. In this study, two propagation phases were proposed based on turbulent Reynolds number ReL and particle settling behaviors. The critical turbulent Reynolds number ReLc was estimated to be the order of one (~ 2 in our estimates). The effects of particle size on the particle settling velocity were relatively small in the early propagation stage (we called the turbulent dominated settling (TDS) propagation phase) due to strong turbulent flow and were significant in the later propagation stage (we called the gravity dominated settling (GDS) propagation phase) because of decreasing turbulence effects. The vertical concentration profiles at the current head were nearly linear within the TDS phase and changed to an exponential profile during their propagation; especially, the concentration profile quickly decreased in large particles. In addition, horizontal particle sorting that is size grading of particles towards the flow direction was more significant rather than vertical particle sorting.
590 $a School code: 1283.
650 4 $a Physical oceanography. $3 3168433
653 $a Particle size distribution
653 $a Particle-driven gravity current
653 $a Settling velocity
653 $a Shallow-water model
653 $a Suspended sediment concentration
653 $a Turbulent flow
690 $a 0415
690 $a 0543
710 2 $a The University of Texas at San Antonio. $b Civil & Environmental Engineering. $3 1023684
773 0 $t Dissertations Abstracts International $g 80-12B.
790 $a 1283
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13857499