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On-line Access: 2014-11-04

Received: 2013-04-18

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Journal of Zhejiang University SCIENCE A 2014 Vol.15 No.11 P.914-924

http://doi.org/10.1631/jzus.A1300135


Design criteria for sediment transport in sewers based on self-cleansing concept


Author(s):  Isa Ebtehaj1, Hossein Bonakdari1, Ali Sharifi2

Affiliation(s):  1. Department of Civil Engineering, Razi University, Kermanshah 67149-67346, Iran; more

Corresponding email(s):   isa.ebtehaj@yahoo.com

Key Words:  Deposited bed, Bed-load, Limit of deposition, Sediment, Sewers


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Isa Ebtehaj, Hossein Bonakdari, Ali Sharifi. Design criteria for sediment transport in sewers based on self-cleansing concept[J]. Journal of Zhejiang University Science A, 2014, 15(11): 914-924.

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Abstract: 
This study of bed-load transport was undertaken on the basis of laboratory data in two states, i.e., limit of deposition and deposited bed, by using new design criteria, whereby, compared to earlier similar studies, fewer parameters were considered, yet with almost the same or in some cases an even greater level of accuracy. The modified criterion in the new design for transport in the limit of deposition was using only three dimensionless parameters, i.e., Froude number, volumetric concentration of sediment, and relative size of the grain. But the new design criterion applied to the deposited bed case used four dimensionless parameters, i.e., three parameters used for the preliminary case besides the relative thickness of sedimentation. Compared with other known relationships in sediment transport, the produced equations introduced here yield better results than previous studies. With the lessened number of parameters, the results are much easier to obtain.

基于自清洁理念的下水道中沉积物运移的设计标准

通过比较沉积物运移的不同标准,经选优得出更高精度的标准。 使用更少的参数和分情况来获得高精度的设计标准。 1. 按状态将下水道中沉积物分成两类:没有沉淀的沉积物和沉淀的推移质;2. 利用已有设计标准的方程,运用非线性回归和MINITAB软件,得到不同情况下的最佳方程式;3. 用实验所得的值对各方程预测值进行验证,比较各方程式的预测精度。 1. 本文提出的方程式可以预测不同情况下的沉积物运移;2. 相比于其它标准,本文提出的方程式形式简单、所需参数少和参数估计简单,并且预测精度更高。
沉积床;推移质;沉积限制;沉积物;下水道

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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