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I am currently studying civil hydraulics in my civil engineering course and we are going through estimating critical shear stresses for sediments. I am confused about the difference between boundary shear stress and particle shear stress. In terms of estimating critical shear stress, is there a difference between using particle shear stress and using boundary shear stress?

How would our results differ by choosing boundary/particle shear stress to begin with?

Thanks everyone in advance!!

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# Difference between partical shear stress and boundary shear stress

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