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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
161

Morpho-sedimentary dynamics of pool-riffle sequences in a gravel-bed river : bedload transport reversal and pool-riffle maintenance

Latulippe, Christian. January 2006 (has links)
Hydraulic and morpho-sedimentary differences between pools and riffles have always intrigued fluvial geomorphologists. Surprisingly, earlier explanations of pool-riffle morpho-sedimentology dynamic focus too exclusively on hydraulic patterns and neglect analysis of sediment transport. Understanding the mechanisms governing pool-riffle morpho-sedimentary dynamics, such as the sediment transport patterns represent a big challenge in fluvial geomorphology, considering the stochastic nature of bedload transport in gravel-bed rivers. The main objective of this thesis is to understand the two-dimensional relationship between hydraulic patterns, sediment transport patterns and morpho-sedimentary changes in pool-riffle sequences and to use these insights to understand how pool-riffle sequences maintain their form over time. / This thesis is organized into four chapters. These chapters analyze hydraulic, sediment transport and morpho-sedimentary measurements collected on a riffle-pool-riffle sequence of the Des Coeurs river during seven controlled experimental floods. Chapter 2 tests the velocity reversal hypothesis (Keller, 1971), with results demonstrating that no velocity reversal was observed in the field, for peak flow up to 123% of the bankfull discharge. Chapter 3 demonstrates the existence of a bedload transport reversal: below 60% of bankfull discharge, sediment transport on the riffle exceeds transport in the pool; as discharge increased, more sediment was exported from the pool than imported, thereby maintaining the pool. Chapter 4 demonstrates that the bedload transport reversal is caused by the spatial heterogeneity of the sediment transport patterns (sediment supply, particle displacements and sediment sorting), which underlies the importance of developing two-dimensional bedload transport formulae. Chapter 5 tests the two-dimensional applicability of well-known bedload transport formulae developed in a one-dimensional environment. None of the formulae could be applied with accuracy in a two-dimensional environment. However, site-specific calibration considerably improves bedload transport rate and grain-size distribution prediction. / This thesis improves the understanding of the morpho-sedimentary dynamics of pool-riffle sequence; it argues that a purely hydraulic view of pool-riffle sequence is insufficient to understand their stability. It explains pool-riffle maintenance as a result of a bedload transport reversal caused by the spatial heterogeneity of the sediment transport patterns, and raises the importance of acquiring two-dimensional sediment transport data to improve two-dimensional bedload transport formulae.
162

Longitudinal dunes, their genesis and ordering / by George Kuang Yee Tseo

Tseo, George Kuang Yee January 1986 (has links)
Bibliography: v. 1, leaves 127-152 / 2 v. : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Geology and Geophysics, 1986
163

Sediment production, storage, and transport processes studied in two semi-arid basins and in a recently burned region of the Mojave National Preserve

Giffin, Joy M. January 2006 (has links)
Thesis (M.S.)--University of Nevada, Reno, 2006. / "December, 2006." Includes bibliographical references (leaves 104-108). Online version available on the World Wide Web.
164

Predicting tracer and contaminant transport with the stratified aquifer approach

Blue, Julie Elena. January 1999 (has links) (PDF)
Thesis (Ph.D. - Hydrology and Water Resources)--University of Arizona. / Includes bibliographical references (leaves 112-119).
165

Checker board drainage due to eroded dikes

Hielscher, Julian Adolph. January 1912 (has links) (PDF)
Thesis (B.S.)--University of Missouri, School of Mines and Metallurgy, 1912. / One folded map inside back cover. The entire thesis text is included in file. Typescript. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed April 20, 2009) Includes bibliographical references.
166

Nearshore ice formation and sediment transport in southern Lake Michigan /

Kempema, Edward W. January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographic references (leaves [146]-152).
167

The use of streambed texture to interpret physical and biological conditions at watershed, reach, and subreach scales /

Buffington, John M. January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [136]-147).
168

Contemporary sediment delivery ratios for small catchments subject to shallow rainfall triggered earthflows in the Waipaoa catchment, North Island, New Zealand : a thesis submitted to the Victoria University of Wellington as partial fulfilment of the requirements for the degree of Master of Science with Honours in Physical Geography /

Jones, Katie Elizabeth. January 2009 (has links)
Thesis (M.Sc.Hons.)--Victoria University of Wellington, 2009. / Includes bibliographical references.
169

Bottom boundary layer physics and sediment transport along a transgressive sand body, Ship Shoal, south-central Louisiana implications for fluvial sediments and winter storms /

Kobashi, Daijiro, January 1900 (has links) (PDF)
Thesis (Ph. D.)--Louisiana State University, Baton Rouge, 2009. / Title from document title page. Includes bibliographical references.
170

Water characterization and sediment transport analyses of the upper Walker River

Schoenleber, James W. January 2008 (has links)
Thesis (M.S.)--University of Nevada, Reno, 2008. / "December, 2008." Includes bibliographical references (leaves 108-109). Online version available on the World Wide Web.

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