dc.contributor.author	Vigilar, Gregorio G. Jr.	en
dc.contributor.committeechair	Diplas, Panayiotis	en
dc.contributor.committeemember	Liapis, Stergios I.	en
dc.contributor.committeemember	Kibler, David F.	en
dc.contributor.committeemember	Ragab, Saad A.	en
dc.contributor.committeemember	Widdowson, Mark A.	en
dc.contributor.department	Civil Engineering	en
dc.date.accessioned	2014-03-14T20:21:59Z	en
dc.date.adate	1997-01-28	en
dc.date.available	2014-03-14T20:21:59Z	en
dc.date.issued	1997-01-28	en
dc.date.rdate	1997-01-28	en
dc.date.sdate	1998-07-12	en
dc.description.abstract	A numerical model which determines the geometry of a threshold channel was recently developed. Such a model is an important tool for designing unlined irrigation canals and channelization schemes, and is useful when considering flow regulation. However, its applicability is limited in that its continuously curving boundary does not allow for sediment transport, which is an essential feature of natural rivers and streams. That model has thus been modified to predict the shape and stress distribution of an optimal stable channel; a channel with a flat-bed region over which bedload transport occurs, and curving bank regions composed of particles that are all in a state of incipient motion. It is the combination of this channel geometry and the phenomenon of momentum-diffusion, that allows the present model to simulate the "stable bank, mobile bed" condition observed in rivers. The coupled equations of momentum-diffusion and force-balance are solved over the bank region to determine the shape of the channel banks (the bank solution). The width of the channel1s flat-bed region is determined by solving the momentum-diffusion equation over the flat-bed region (the bed solution), using conditions at the junction of the flat-bed and bank regions that ensure matching of the bed and bank solutions. The model was tested against available experimental and field data, and was found to adequately predict the bank shape and significant dimensions of stable channels. To make the model results more amenable to the practic ing engineer, design equations and plots were developed. These can be used as an alternative solution for stable channel design; relieving the practitioner of the need to run the numerical program. The case of a stable channel that transports both bedload and suspended sediment is briefly discussed. Governing equations and a possible solution scheme for this type of channel are suggested; laying the groundwork for the development of an appropriate numerical model.	en
dc.description.degree	Ph. D.	en
dc.identifier.other	etd-424817300974290	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-424817300974290/	en
dc.identifier.uri	http://hdl.handle.net/10919/30528	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	Abstract.pdf	en
dc.relation.haspart	Appndxa.pdf	en
dc.relation.haspart	Appndxb.pdf	en
dc.relation.haspart	Appndxc.pdf	en
dc.relation.haspart	Appndxd.pdf	en
dc.relation.haspart	Chap1.pdf	en
dc.relation.haspart	Chap2.pdf	en
dc.relation.haspart	Chap3.pdf	en
dc.relation.haspart	Chap4.pdf	en
dc.relation.haspart	Chap5a.pdf	en
dc.relation.haspart	Chap5b.pdf	en
dc.relation.haspart	Chap5c.pdf	en
dc.relation.haspart	Chap6.pdf	en
dc.relation.haspart	Chap7.pdf	en
dc.relation.haspart	Etd.pdf	en
dc.relation.haspart	Frontmtr.pdf	en
dc.relation.haspart	Refrnces.pdf	en
dc.relation.haspart	Vita.pdf	en
dc.relation.haspart	etd.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	momentum-diffusion	en
dc.subject	mobile	en
dc.subject	threshold	en
dc.subject	stable	en
dc.subject	optimal	en
dc.title	Determination of Optimal Stable Channel Profiles	en
dc.type	Dissertation	en
thesis.degree.discipline	Civil Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	doctoral	en
thesis.degree.name	Ph. D.	en

Determination of Optimal Stable Channel Profiles

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