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Small-scale sediment transport proce...

Webb, Bret Maxwell.

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Small-scale sediment transport processes and bedform dynamics.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Small-scale sediment transport processes and bedform dynamics./
Author:	Webb, Bret Maxwell.
Description:	304 p.
Notes:	Adviser: Donald N. Slinn.
Contained By:	Dissertation Abstracts International69-06B.
Subject:	Engineering, Civil. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3322967
ISBN:	9780549726944

Small-scale sediment transport processes and bedform dynamics.
Webb, Bret Maxwell.

Small-scale sediment transport processes and bedform dynamics. - 304 p.

Adviser: Donald N. Slinn.

Thesis (Ph.D.)--University of Florida, 2008.

The generation of small-scale sedimentary structures in the coastal environment is a complex process that occurs over a wide separation of scales in both time and space. These bedforms are ubiquitous features of the nearshore region, and yet specific information regarding their behavior and characteristics is still lacking. Specifically, it is unclear whether the bedload-dominated processes of the linear regime are as equally responsible for the generation of bedforms in the nonlinear regime, where flow separation, and subsequent vortex formation, tend to govern the dynamics of the bottom boundary layer. While a simple one-dimensional model is derived and used to explain incipient bedform growth in the linear regime, such an approach is not well-suited at addressing the complexities of the wave bottom boundary layer. Utilizing a new three-dimensional phase-resolving live-bed model, we simulate the dynamics of bedforms, such as sand ripples, in the nonlinear regime. Through forty-three independent simulations, the model has been found to reproduce oscillatory boundary layer flow, as well as provide accurate predictions of ripple geometry in both lab- and field-scale flows. Model results confirm that in the linear regime, bedform growth is promoted purely through bedload sediment transport, but inertial properties of the sediment are equally as important. In the nonlinear regime, bedform growth is also dominated by bedload transport; however, the entrainment and deposition of bed material plays an important role in maintaining ripple equilibrium, whereas it is mostly responsible for ripple decay.

ISBN: 9780549726944Subjects--Topical Terms:

783781
Engineering, Civil.

Small-scale sediment transport processes and bedform dynamics.
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020 $a 9780549726944
035 $a (UMI)AAI3322967
035 $a AAI3322967
040 $a UMI $c UMI
100 1 $a Webb, Bret Maxwell. $3 1277356
245 1 0 $a Small-scale sediment transport processes and bedform dynamics.
300 $a 304 p.
500 $a Adviser: Donald N. Slinn.
500 $a Source: Dissertation Abstracts International, Volume: 69-06, Section: B, page: .
502 $a Thesis (Ph.D.)--University of Florida, 2008.
520 $a The generation of small-scale sedimentary structures in the coastal environment is a complex process that occurs over a wide separation of scales in both time and space. These bedforms are ubiquitous features of the nearshore region, and yet specific information regarding their behavior and characteristics is still lacking. Specifically, it is unclear whether the bedload-dominated processes of the linear regime are as equally responsible for the generation of bedforms in the nonlinear regime, where flow separation, and subsequent vortex formation, tend to govern the dynamics of the bottom boundary layer. While a simple one-dimensional model is derived and used to explain incipient bedform growth in the linear regime, such an approach is not well-suited at addressing the complexities of the wave bottom boundary layer. Utilizing a new three-dimensional phase-resolving live-bed model, we simulate the dynamics of bedforms, such as sand ripples, in the nonlinear regime. Through forty-three independent simulations, the model has been found to reproduce oscillatory boundary layer flow, as well as provide accurate predictions of ripple geometry in both lab- and field-scale flows. Model results confirm that in the linear regime, bedform growth is promoted purely through bedload sediment transport, but inertial properties of the sediment are equally as important. In the nonlinear regime, bedform growth is also dominated by bedload transport; however, the entrainment and deposition of bed material plays an important role in maintaining ripple equilibrium, whereas it is mostly responsible for ripple decay.
590 $a School code: 0070.
650 4 $a Engineering, Civil. $3 783781
650 4 $a Engineering, Marine and Ocean. $3 1019064
690 $a 0543
690 $a 0547
710 2 $a University of Florida. $3 718949
773 0 $t Dissertation Abstracts International $g 69-06B.
790 $a 0070
790 1 0 $a Slinn, Donald N., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3322967