Chegg Guided Solutions for Water Resources Engineering 2nd Edition: Chapter 18.3

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    6534-18.3-1P AID: 1825 | 08/02/2013

    Find the critical shear stress by using the formula

    Denote Specific weight of sediment particle as , Specific weight of water as , Specific gravity as g, Sand size as , Critical shear stress as , and actual shear stress as

    Use the shields formula to compute from shields diagram

    From shields diagram the value is taken as 0.065

    Find the critical shear stress by substituting the values of 2.65 for , for

    Therefore, the critical shear stress is

    Find the actual shear stress using the formula

    Denote Depth of wide rectangular channel as y (R=y)

    Find the actual shear stress by substituting the values of 2.5 m for R, 9810 kg/m3 for γ, and 0.0003 for S

    Therefore, the actual shear stress is

    The actual shear stress is much larger than the critical shear stress; transport of the fine sand particles is expected.

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