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Numerical, experimental, and theoret...

Imran, Jasim.

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Numerical, experimental, and theoretical studies of inception and meandering of submarine channels.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Numerical, experimental, and theoretical studies of inception and meandering of submarine channels./
Author:	Imran, Jasim.
Description:	147 p.
Notes:	Source: Dissertation Abstracts International, Volume: 58-09, Section: B, page: 4984.
Contained By:	Dissertation Abstracts International58-09B.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9808941
ISBN:	9780591593501

Numerical, experimental, and theoretical studies of inception and meandering of submarine channels.
Imran, Jasim.

Numerical, experimental, and theoretical studies of inception and meandering of submarine channels. - 147 p.

Source: Dissertation Abstracts International, Volume: 58-09, Section: B, page: 4984.

Thesis (Ph.D.)--University of Minnesota, 1997.

The use of acoustic techniques in recent years for imaging the ocean floor has revealed interesting and beautiful morphologies on depositional zones of sediment commonly known as submarine fans. Many such fans show intricate pattern of channelization with high natural levees and river-like meandering planform. Here, numerical, experimental, and theoretical studies have been conducted in order to understand the mechanics involved in the inception and growth of such channels. A numerical model of channel inception from the passage of turbidity currents has been developed. The conservation equations of mass, momentum and sediment concentration in a turbidity current and the exchange of sediment between the bed and the turbid water column have been derived, layer-integrated, normalized and then solved by using an implicit finite difference scheme. Numerical experiments helped to identify the relative importance of different flow parameters on the incipient channel-levee shapes evolved from the passage of a turbidity current. Three-dimensional experiments on turbidity currents have been performed to verify the findings of the numerical model. Turbidity currents were released in an experimental basin filled with fresh water that produced a channelized sediment deposit. The flow conditions of the experiment were then used in the above mentioned numerical model to simulate the evolution of the bed. The comparison between the numerical and measured profiles show good agreement. A nonlinear model of flow in subaerial and submarine meandering channels has been also developed. The governing equations of turbidity currents and open channel flow have been brought to a common form in an intrinsic coordinate system. The equations are solved at linear, 2nd-order nonlinear and fully nonlinear levels. The simulated flow in a submarine channel and a dynamically equivalent river have been compared. From the known geometry of a now-dormant submarine channel it has been possible to infer a range of flow velocity and sediment concentration that would have allowed the growth and migration of meander bends.

ISBN: 9780591593501Subjects--Topical Terms:

535228
Geophysics.

Numerical, experimental, and theoretical studies of inception and meandering of submarine channels.
LDR:03043nam 2200289 4500 001 1403434
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020 $a 9780591593501
035 $a (UMI)AAI9808941
035 $a AAI9808941
040 $a UMI $c UMI
100 1 $a Imran, Jasim. $3 1682693
245 1 0 $a Numerical, experimental, and theoretical studies of inception and meandering of submarine channels.
300 $a 147 p.
500 $a Source: Dissertation Abstracts International, Volume: 58-09, Section: B, page: 4984.
500 $a Adviser: Gary Parker.
502 $a Thesis (Ph.D.)--University of Minnesota, 1997.
520 $a The use of acoustic techniques in recent years for imaging the ocean floor has revealed interesting and beautiful morphologies on depositional zones of sediment commonly known as submarine fans. Many such fans show intricate pattern of channelization with high natural levees and river-like meandering planform. Here, numerical, experimental, and theoretical studies have been conducted in order to understand the mechanics involved in the inception and growth of such channels. A numerical model of channel inception from the passage of turbidity currents has been developed. The conservation equations of mass, momentum and sediment concentration in a turbidity current and the exchange of sediment between the bed and the turbid water column have been derived, layer-integrated, normalized and then solved by using an implicit finite difference scheme. Numerical experiments helped to identify the relative importance of different flow parameters on the incipient channel-levee shapes evolved from the passage of a turbidity current. Three-dimensional experiments on turbidity currents have been performed to verify the findings of the numerical model. Turbidity currents were released in an experimental basin filled with fresh water that produced a channelized sediment deposit. The flow conditions of the experiment were then used in the above mentioned numerical model to simulate the evolution of the bed. The comparison between the numerical and measured profiles show good agreement. A nonlinear model of flow in subaerial and submarine meandering channels has been also developed. The governing equations of turbidity currents and open channel flow have been brought to a common form in an intrinsic coordinate system. The equations are solved at linear, 2nd-order nonlinear and fully nonlinear levels. The simulated flow in a submarine channel and a dynamically equivalent river have been compared. From the known geometry of a now-dormant submarine channel it has been possible to infer a range of flow velocity and sediment concentration that would have allowed the growth and migration of meander bends.
590 $a School code: 0130.
650 4 $a Geophysics. $3 535228
650 4 $a Hydrology. $3 545716
650 4 $a Engineering, Civil. $3 783781
690 $a 0373
690 $a 0388
690 $a 0543
710 2 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 58-09B.
790 1 0 $a Parker, Gary, $e advisor
790 $a 0130
791 $a Ph.D.
792 $a 1997
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9808941