Mechanics of Bio-Sediment Transport by Hongwei Fang & Lei Huang & Huiming Zhao & Wei Cheng & Yishan Chen & Mehdi Fazeli & Qianqian Shang

Author:Hongwei Fang & Lei Huang & Huiming Zhao & Wei Cheng & Yishan Chen & Mehdi Fazeli & Qianqian Shang
Language: eng
Format: epub
ISBN: 9783662611586
Publisher: Springer Berlin Heidelberg

According to Yalin and Kaharan (1979), the equation of dune steepness can be expressed as:

(3.18)

where

(3.19)

and ηd is the value of η corresponding to (Δ/λ)max.

For bio-sediment, the variation trend of bedform steepness with flow conditions is close to that for noncohesive sediment, but their maximum values of steepness are different. As shown in Fig. 3.15, the η value corresponding to the maximum bedform steepness (Δ/λ)max is ηd = 6.13 for bio-sediment; thus, f(h/D50 ≥ 2000) = 0.195 according to Eq. 3.19. Therefore, the bedform steepness for bio-sediment, identified as dunes, can be expressed as

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