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dc.contributor.authorBoraey, Ahmed
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2014-03-30 16:27:07.025en
dc.date.accessioned2014-03-31T19:58:31Z
dc.date.issued2014-03-31
dc.identifier.urihttp://hdl.handle.net/1974/8678
dc.descriptionThesis (Ph.D, Civil Engineering) -- Queen's University, 2014-03-30 16:27:07.025en
dc.description.abstractThis thesis concerns the development of alternate bars under steady state flows. The movable bed is flat at the beginning of the experiment; the bars reach their equilibrium or developed state at the time Td. The thesis has two objectives. The first is to introduce new equations for the geometric characteristics, namely height and length, of alternate bars at the fully developed stage, and to evaluate them against the existing equations. The second objective is to present the results of two series of experiments carried out to characterize the process of development of alternate bars and obtain estimates of their time of development. The data resulting from these experiments are intended as a foundation for future work towards the establishment of a predictive equation for the development time of alternate bars. The new equations for bar height and length rest on dimensional considerations and all the available data. Bars produced under rough turbulent and transitional flows are treated separately. The proposed equations are found to consistently give more accurate estimates of alternate bar dimensions than existing equations. The experiments to quantify the time of development of alternate bars are carried out in the 21 m long, 0.76 m wide sediment transport flume of the Queen’s Coastal Engineering Laboratory. In addition to providing estimates of the time of development of alternate bars, these experiments reveal aspects of the process of development of alternate bars that had not been reported previously. In particular, they show that, all other conditions being the same (including the sediment transport capacity of the initial flow), the more pronounced alternate bars formed under shallower flows develop faster than less pronounced bars formed under deeper flows. The findings of this study highlight the fact that the previously unexplained wide variation in alternate bar dimensions is related to the plotting position of the data point in the alternate bar existence region of Ahmari and da Silva (2011). This study also sheds light on the evolution and development of alternate bars, which establishes a strong foundation for future studies on the topic.en_US
dc.languageenen
dc.language.isoenen_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectDevelopment timeen_US
dc.subjectAlternate barsen_US
dc.subjectGeometric characteristicsen_US
dc.subjectPredictive equationen_US
dc.subjectRiver processen_US
dc.titleAlternate Bars Under Steady State Flows: Time of Development and Geometric Characteristicsen_US
dc.typethesisen_US
dc.description.restricted-thesisThe work in the thesis is part of an on-going research that is to be completed.en
dc.description.degreePh.Den
dc.contributor.supervisorda Silva, Ana Maria Ferreiraen
dc.contributor.departmentCivil Engineeringen
dc.embargo.terms1825en
dc.embargo.liftdate2019-03-30


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