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Study of suspended sediment in closed channels

Citation

Ismail, Hassan M. (1949) Study of suspended sediment in closed channels. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-04262004-152823

Abstract

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Tests on a rectangular channel 10.5 by 3 inches in cross-section transporting water mixed with different amounts of sand are described in this thesis. Two sizes of sand were used. They are of mean sedimentation diameter of 0.10 mm. and 0.16 mm.

Th experimental data were used to study both the effects of the presence of sand in suspension on the characteristics of the flow, and the concentration transfer coefficient at the middle of the channel, assuming a two-dimensional flow.

It was found the the von Karman universal constant of turbulent exchange k decreases with the increase of the suspended material. k decreased to 0.20 when a total load of about 25 kilograms was added to the flume, i.e., 43 grams were added to each liter. No limit was approached for the decreased of k. The friction coefficient [...] was hardly affected by the presence of the sand when the velocity of flow was higher than a certain velocity. This critical velocity increased with the total load in the flume and the size of the sand used. It is related to the bed load and it is the velocity at which all the dunes on the bed are carried in suuspension. Below that critical velocity [...] exceeds that of clear water.

The sediment transfer coefficient [...] was found to be equal to 1.5, the momentum transfer coefficient [...] for the 0.10 mm. sand, and to 1.3 [...] for the 0.16 mm. sand. [...] follows the normal parabolic form of [...] at the outer two-thirds of the channel and has a constant value at the middle third.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Civil Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Vanoni, Vito A.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1949
Record Number:CaltechETD:etd-04262004-152823
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-04262004-152823
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1509
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:29 Apr 2004
Last Modified:26 Dec 2012 02:38

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