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For sand bed streams, incipient motion unstable if:

For sand bed streams, incipient motion unstable if:

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Please answer item a and b.

For sand bed streams, incipient motion of sediment so that the bed becomes unstable if: a) b) Determine if channel bed erosion will occur or not if the flow velocity is 1.6 m/sec and flow depth is 0.2 m in a rectangular-shaped stream with the following hydraulic and sediment properties: sediment size grain diameter 3 mm; specific gravity of sediment = 2.65; channel width = 8 m; = channel slope = 0.001; and, Manning's roughness coefficient = 0.03. - If incipient motion of sediment occurs at the flow condition given above and you want to make the streambed stable (no incipient motion), would you widen or narrow the channel, and how much (wider or narrower). Assume that the flow velocity and flow area remains the same at 1.6 m/sec and 1.6 square meters, respectively.
Transcribed Image Text:For sand bed streams, incipient motion of sediment so that the bed becomes unstable if: a) b) Determine if channel bed erosion will occur or not if the flow velocity is 1.6 m/sec and flow depth is 0.2 m in a rectangular-shaped stream with the following hydraulic and sediment properties: sediment size grain diameter 3 mm; specific gravity of sediment = 2.65; channel width = 8 m; = channel slope = 0.001; and, Manning's roughness coefficient = 0.03. - If incipient motion of sediment occurs at the flow condition given above and you want to make the streambed stable (no incipient motion), would you widen or narrow the channel, and how much (wider or narrower). Assume that the flow velocity and flow area remains the same at 1.6 m/sec and 1.6 square meters, respectively.
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