Title: Turbidity currents and sedimentation in closed-end channels
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00098257/00001
 Material Information
Title: Turbidity currents and sedimentation in closed-end channels
Physical Description: xx, 212 leaves : ill. ; 28 cm.
Language: English
Creator: Lin, Chung-po, 1954- ( Dissertant )
Mehta, Ashish J. ( Thesis advisor )
Varma, Arun K. ( Reviewer )
Christensen, Bent A. ( Reviewer )
Dean, Robert G. ( Reviewer )
Sheppard, Donald M. ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1987
Copyright Date: 1987
Subjects / Keywords: Channels (Hydraulic engineering)   ( lcsh )
Turbidity currents   ( lcsh )
Sediment transport   ( lcsh )
Civil Engineering thesis Ph. D
Dissertations, Academic -- Civil Engineering -- UF
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
Abstract: As a result of concern over sedimentation and water quality in Closed-end channels such as docks, pier slips and residential canals, an investigation on the front behavior of turbidity currents and associated sedimentation in a closed-end channel was carried out. The focus of the present study was on the case of a closed'-end channel of rectangular cross section and horizontal bed connected orthogonally to a main channel, where turbulent flow and high suspension concentration existed. Experiments were conducted in two specially designed flume systems to investigate front characteristics of turbidity currents, flow regime, and sediment deposition. A group of dimensionless parameters for each physical aspect of concern derived from dimensional analysis provided the basis for selecting the measurement Items in laboratory experiments and for presenting tl-:e results. A two-dimensional, explicit, coupled finite difference numerical model for simulating vertical flow circulation and sedimentation in a ciosed-end channel was made. In addition, analytic cal developments for the longitudinal distribution of mean concentration below interface, flow field, the maximum rise of water surface, sediment flux through the entrance^ and tide-induced deposition were also attempted. No significant differences were found between the front shapes of turbidity currents and non'--settling gravity currents. The rate of the decrease of front speed of turbidity currents with distance was faster than that of non-settling gravity currents. Characteristics which showed an exponential-type decrease with distance in the closed-end channel include front speed, mean concentration below interface, front concentration, settling velocity of suspension, dispersed particle size of deposit, and deposition rate. The relative settling velocity, i.e. the ratio of particle settling velocity to the densimetric velocity, was found to be the best parameter to interpret the differences between tests. Durations of front propagation in the initial adjustment phase, inertial self-similar phase, and viscous self-similar phase were found to be mainly dependent on sediment type and the relative settling velocity. A relationship for predicting the sediment flux into a closed-^end channel through entrance was found. According to the relationship, the sediment flux is proportional to H^/2 and C^ , where H is the total water depth and Ci is the depthi-mean concentration at the entrance of the closed-end channel. It was shown that the numerical model could simulate the suspension concentration distribution in the channel satisfactorily.
Thesis: Thesis (Ph. D.)--University of Florida, 1987.
Bibliography: Bibliography: leaves 205-211.
General Note: Typescript.
General Note: Vita.
Statement of Responsibility: by Chung-po Lin.
 Record Information
Bibliographic ID: UF00098257
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000949559
notis - AER1715
oclc - 016928035


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