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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.
441

Development of a mathematical N-line model for simulation of beach changes

Dang, Van To, Civil & Environmental Engineering, Faculty of Engineering, UNSW January 2006 (has links)
The development of a new N-Line model, which provides a practical tool for simulating regional beach changes induced by short and long-term processes, is described in this thesis. The new N-Line model consists of four main modules that together describe the hydrodynamic and morphological responses. The four constituent modules have been integrated based on a wide range of research including the utility and function of commercial or freeware models. They are RCPWAVE wave module, time-averaged and depth-integrated current module, sediment transport module based on Bailard (1981) and contour change morphological module. Two different time-scales and two staggered grid systems for hydrodynamic and morphological simulations were adopted alternatively. For short-term 2D profile changes, new N-Line model applicability has been examined using data from the laboratory to the field. For ideal beaches, new N-Line can simulate an offshore storm bar generation or an onshore accretion due to high or low energy waves. For SUPERTANK large-scale flume data, the predicted profile matched the measured profile well, especially the bar height and position. For beach profile data from the Gold Coast, storm-induced variations of barred profiles were reasonably modelled. The new N-Line model compared well with other commonly used cross-shore models such as SBEACH and UNIBEST. A new schematisation for a non-monotonic profile and DUNED inclusion were introduced. Sensitivity tests on cross-shore sediment coefficient (Kq), smoothing parameter (??s) and water level fluctuations were performed. For long-term 3D beach changes, the new N-Line model applicability has been tested with various boundary conditions using idealized and real field data. Two periods, 17 and 16 months, of beach changes before and after a major bypass plant commenced operation in 2001 at Letitia Spit were simulated. The profile and shoreline changes were predicted reasonably well. Empirical model parameters were determined after a range of sensitivity and calibration testing. The new N-Line model showed its better performance compared to one-line models. It can handle various boundary conditions, especially bypass conditions. The N-Line model is not only capable of modelling planform variations but also cross-shore profile changes.
442

Vegetation Dynamics Over the Northeast Region of Brazil and Their Connections With Climate Variability During the Last Two Decades of the Twentieth Century.

Barbosa, Humberto January 2004 (has links) (PDF)
Thesis (Ph. D. - Soil, Water and Environmental Science)--University of Arizona, 2004. / Includes bibliographical references (leaves 175-187).
443

The use of deep-sea corals as paleoceanographic monitors /

Smith, Jodie Ellen. January 1997 (has links)
Thesis (Ph.D.) -- McMaster University, 1998. / Includes bibliographical references (leaves 148-150). Also available via World Wide Web.
444

Environmental history of northern cod from otolith isotopic analysis /

Jamieson, Robyn E. January 2001 (has links)
Thesis (Ph.D.) -- McMaster University, 2001. / Includes bibliographical references. Also available via World Wide Web,
445

Vegetational and climatic changes during the last 40,000 years at Burraga Swamp, Barrington Tops, NSW /

Sweller, Susan. January 2001 (has links)
Thesis (M. Sc.)--University of New South Wales, 2001. / Also available online.
446

A late holocene reconstruction of ocean climate variability in the Gulf of Maine, USA, based on calibrated isotope records and growth histories from the long-lived ocean quahog (Arctica islandica L.) /

Wanamaker, Alan D., January 2007 (has links) (PDF)
Thesis (Ph.D.) in Earth Sciences--University of Maine, 2007. / Includes vita. Includes bibliographical references (leaves 106-129).
447

Spatio-temporal hidden Markov models for incorporating inter-annual variability in rainfall

Frost, Andrew James. January 2004 (has links)
Thesis (Ph. D.) -- University of Newcastle, 2004. / School of Engineering. Discipline of Civil, Surveying and Environmental Engineering. Includes bibliographical references (leaves 205 - 217). Also available online.
448

Solar activity and recent climate change evaluating the impact of geomagnetic activity on atmospheric circulation /

Palamara, Daniel. January 2003 (has links)
Thesis (Ph.D.)--University of Wollongong, 2003. / Typescript. Bibliographical references: leaf 287-305.
449

A molecular study of the forensically important calliphoridae (diptera) : implications and applications for the future of forensic entomology /

Harvey, Michelle. January 2006 (has links)
Thesis (M.For.Sc./Ph.D.)--University of Western Australia, 2006.
450

ReDesign for a new energy paradigm /

Lewton, Alexander Tripp. January 2008 (has links) (PDF)
Thesis (M Arch)--Montana State University--Bozeman, 2008. / Typescript. Chairperson, Graduate Committee: Christopher Livingston. Includes bibliographical references (leaves 97-99).

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