| EXPERIMENTAL STUDY ON INCIPIENT MOTION OF SEDIMENT PARTICLES ON GENERALIZED SLOPING FLUVIAL BEDS |
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| 作者姓名： | Subhasish DEY Asst. Prof. Dept. of Civil Engrg. Indian Inst. of Tech. Kharagpur West Bengal India. Fax: |
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| 作者单位： | Subhasish DEY Asst. Prof.，Dept. of Civil Engrg.，Indian Inst. of Tech.，Kharagpur 721302，West Bengal，India. Fax: +91 3222 82254; |
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| 摘 要： | 1 INTRODUCTIONWhen water flows over a fluvial bed, hydro-dynandc force induced by the flow is acting on thesediment particles lying on the bed. A further increase in flow velocity results in an increase in themagnitude of this fOrce; and sediment particles begin to move if a situation is eventu8lly reached whenthe hydro-dynandc force exceeds a certain critical value. This initial movement of sediment pallicles istermed inciPient motion. The erosion and sedimentation of nuvial beds can be…
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EXPERIMENTAL STUDY ON INCIPIENT MOTION OF SEDIMENT PARTICLES ON GENERALIZED SLOPING FLUVIAL BEDS |
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| Subhasish DEY Asst. Prof.,Dept. of Civil Engrg.,Indian Inst. of Tech.,Kharagpur ,West Bengal,India. Fax: ,.EXPERIMENTAL STUDY ON INCIPIENT MOTION OF SEDIMENT PARTICLES ON GENERALIZED SLOPING FLUVIAL BEDS[J].International Journal of Sediment Research,2001,16(3). |
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| Authors: | Subhasish DEY |
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| Abstract: | This paper presents an experimental investigation on incipient motion of non-cohesive uniform sediment under a steady-uniform stream flow on generalized sloping fluvial beds (combined lateral and stream-wise slope). The characteristic parameters affecting the incipient motion of sediment particles, identified based on the physical reasoning and dimensional analysis, are the threshold shear stress ratio (ratio of threshold shear stress for sloping bed to that for horizontal bed), lateral slope, stream-wise slope and angle of repose of sediment particles. Experiments were carried out in two ducts (closed-conduit flow) having section of semicircular invert with three types of sediments. In an open channel flow (laboratory flume study), the uniform flow is a difficult, if not impossible, proposition for a steeply sloping channel and is impossible to obtain in an adversely sloping channel. To avoid this problem, the tests were conducted with a closed-conduit flow. Equation of critical bed shear stress for the initial movement of sediment particles on generalized sloping beds was obtained using the experimental data. |
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| Keywords: | Granular material Sediment Fluvial bed Incipient motion Sediment transport Sediment threshold Fluvial hydraulics |
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