What is it about?
This article explore the effect of sediment bed thickness on the minimum/critical velocity of flow that start to move the sediment particle. We have shown that there is a logarithmic relationship between the bed thickness and the minimum velocity.
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Why is it important?
We develop an equation that take into account the sediment bed thickness on minimum/critical velocity. This equation can be used for design of sewer/ drain that have the ability to have self-cleansing properties to reduce sediment build up that need frequent cleaning.
Perspectives
Existing equations on critical velocity are mostly taking the assumption that the sediment bed thickness are unlimited (loose boundary) which is practical for alluvial channel/river. However these equations tend to overpredict the critical velocity when used for design of drain/sewer to reduce sediment buildup. This article tries to understand how sediment deposit thickness influences the critical velocity/flow characteristics and attempt toward unifying the equations for both unlimited and limited sediment depth.
Assoc. Prof. Ir. Dr. Charles H.J. Bong
Universiti Malaysia Sarawak
Read the Original
This page is a summary of: Sediment deposit thickness and its effect on critical velocity for incipient motion, Water Science & Technology, August 2016, IWA Publishing,
DOI: 10.2166/wst.2016.376.
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