Sediment transport characteristics due to rainfall


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Sediment transport characteristics due to rainfall

M.J. Uddin*, C. Mondal

HIGHLIGHTS

  • Soil erosion due to rainfall is evaluated.
  • Effect of rainfall quantity is determined on bed and suspended loads.
  • Effect of flow velocity is evaluated on suspended load.
  • Effect of rainfall is evaluated on grain size distribution.
  • Effect of channel lining on soil erosion is obtained.

ABSTRACT

Studying sediment transportation and it’s type (i.e. bed load and suspended load) are very helpful to assess its conveyance style. Sediment conveyance style (drag, lift etc.), size and type of sediment to be transported are vastly depending on rainfall intensity, velocity of the current flow, type of lining, etc. So after this experimental analysis we can achieve a perception of sediment conveyance style. The study was undertaken to investigate the characteristics of bed load and suspended sediment transportation in open channel. A shallow open channel at Khulna University of Engineering & Technology (KUET) in Bangladesh is taken as the domain. The channel is an artificial type channel located and 0.8 km long. Generally this channel is used as a storm water drain. It has no flow most of the time in the dry season. But it has a current flow during rainy season. This flow abounds with suspended load and bed load with itself. It has no lining but some vegetation is always present at the bottom and bank of the channel. So this channel quite erosion protected during current flow. Four sections were taken for this experiment. Two of these sections were non-alluvial, which were prepared by providing a brick lining. These two sections were taken at 20 ft intervals and the brick lining is 30 ft long and 2.5 ft wide which cover the bottom of the channel. The uncovered side slope was covered by polyethylene paper all through experiment period, so a perfect non-alluvial condition was prepared. The other two of these four sections were taken as alluvial at 20 ft interval by weeding the vegetation. In one of these sections slight vegetation was allowed to see the effect of vegetation as a lining. Finally, we have found a straight distinction as a sediment conveyance result, in case of alluvial and non-alluvial sections. Alluvial sections always yield sediment of higher diameter and amount rather than non-alluvial sections. But distinction also found in alluvial sections in case of fully alluvial section and slightly vegetation allowed section.

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To cite this article: Uddin MJ, Mondal C. Sediment transport characteristics due to rainfall. Journal of Advanced Civil Engineering Practice and Research 2016;3:3-8.

To link this article: http://ababilpub.com/download/jacepr3-2/