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Information Journal Paper

Title

Experimental study of the effect of bed’ s coarse sediment on the deposition and entrapment process of suspended cohesive sediment

Pages

  83-93

Abstract

 Bed material is one of the factors affecting the Deposition and entrapping of Cohesive Sediments. In present research, the Entrapment of Cohesive Sediments was studied for two beds with coarse grains (i. e., D50= 2. 4 and 9. 4 mm) and also a smooth bed in a Circular Flume. The effects of coarse bed sediments on the entrapping and Deposition of suspended sediments have been tested for different concentrations and different shear stress. The experiments were carried out in two modes of smooth and rough beds for three initial concentrations 5, 10 and 20 g/l and three flow velocities 0. 14, 0. 24 and 0. 34 m/s. The results showed that, for both smooth and rough beds, the concentration of suspended sediments decreases with time, although the roughness beds cause to increase the amount of the Deposition rate and the time of reaching to an equilibrium concentration. The results also showed that, with increasing shear stress and initial concentration, the entrapping coefficients in bed containing grains with D50= 2. 4 and D50= 9. 4 respectively are about 5. 7 and 3. 5 times more than that of the smooth bed. Increasing the entrapping coefficient in larger shear stresses can be explained by considering the effects of coarse-grained bed sediments on reducing the flow velocity and generating bursting-sweep phenomena due to flow turbulence.

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    APA: Copy

    Khastar Boroujeni, Milad, KHODASHENAS, SAEEDREZA, & Samadi Boroujeni, Hossin. (2018). Experimental study of the effect of bed’ s coarse sediment on the deposition and entrapment process of suspended cohesive sediment. JOURNAL OF HYDRAULICS, 13(3 (133) ), 83-93. SID. https://sid.ir/paper/124210/en

    Vancouver: Copy

    Khastar Boroujeni Milad, KHODASHENAS SAEEDREZA, Samadi Boroujeni Hossin. Experimental study of the effect of bed’ s coarse sediment on the deposition and entrapment process of suspended cohesive sediment. JOURNAL OF HYDRAULICS[Internet]. 2018;13(3 (133) ):83-93. Available from: https://sid.ir/paper/124210/en

    IEEE: Copy

    Milad Khastar Boroujeni, SAEEDREZA KHODASHENAS, and Hossin Samadi Boroujeni, “Experimental study of the effect of bed’ s coarse sediment on the deposition and entrapment process of suspended cohesive sediment,” JOURNAL OF HYDRAULICS, vol. 13, no. 3 (133) , pp. 83–93, 2018, [Online]. Available: https://sid.ir/paper/124210/en

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