The comparison of empirical formula to predict the incipient motion of weak cohesive sediment mixture

Mojtaba Porhemmat, Wan Hanna Melini Wan Mohtar, Chuah Run En, Juliana Abd Jalil

Research output: Contribution to journalArticle

Abstract

Available incipient sediment motion models were mostly developed based on homogeneous non-cohesive sediment. In non-homogeneous sediment mixture, particularly with fraction of cohesive particles might have an effect on the values of incipient sediment motion using the available models. In this study the effects of weak cohesive material on the incipient motion of sand-silt mixture were investigated in laboratory and compared with different existing formulas. Fine sand with median grain size of d50=153 μm was used whilst the cohesive material is kaolinite-silt with d50=28 μm. The sand-silt mixtures were prepared with sand percentage (Sa)/Silt percentage (Si) distributions ranging from 100Sa/0Si to 0Sa/100Si. The condition for incipient sediment motion was defined in categories number 4 (i.e. frequent particle movement at nearly all locations) and number 6 (i.e. permanent particle movement at all locations) of 7 categories introduced by the Delft Hydraulic. Values of critical Shields parameter were monotonously increased as the percentage of silt increased but reached a relatively constant value as the silt percentage reached 50%. Comparing the data for the particular sediment range used in this study proved that the Brownlie, Van Rijn and Miedema relationships are capable to calculate the Shields parameter within the range of category 4 and 6.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalJurnal Teknologi
Volume78
Issue number9-4
DOIs
Publication statusPublished - 2016

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Silt
Sediments
Sand
Kaolinite
Hydraulics

Keywords

  • Cohesive sediment
  • Incipient of motion
  • Sand-silt mixture

ASJC Scopus subject areas

  • Engineering(all)

Cite this

The comparison of empirical formula to predict the incipient motion of weak cohesive sediment mixture. / Porhemmat, Mojtaba; Wan Mohtar, Wan Hanna Melini; En, Chuah Run; Abd Jalil, Juliana.

In: Jurnal Teknologi, Vol. 78, No. 9-4, 2016, p. 109-114.

Research output: Contribution to journalArticle

Porhemmat, Mojtaba ; Wan Mohtar, Wan Hanna Melini ; En, Chuah Run ; Abd Jalil, Juliana. / The comparison of empirical formula to predict the incipient motion of weak cohesive sediment mixture. In: Jurnal Teknologi. 2016 ; Vol. 78, No. 9-4. pp. 109-114.
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