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This tool applies a standard formula from the relevant domain. The computation is deterministic — given the same inputs, the result is always identical. The formula accounts for the primary variables that determine the output.
θ = τ₀ / ((ρs−ρ)gd); θc ≈ 0.06 (Shields parameter)The calculation requires: Bed Shear Stress τ₀, Grain Density ρs, Fluid Density ρ, Grain Diameter. Each parameter contributes to the final result according to the formula above. Accuracy depends on the precision of your input measurements.
Updated: July 2026
A typical use case demonstrating the calculator with representative values.
→ Calculated result based on the formula and provided inputs
Enter your own values to get a personalized result for your specific situation.
→ Result calculated from your specific input values
Check the expected unit for each input field (shown as suffix). Converting between imperial and metric units before entering values prevents calculation errors.
Ensure denominator values (divisors) are non-zero. The calculator validates this, but understanding which fields cannot be zero helps interpret results correctly.
Calculate Shields parameter and compare to critical value for sediment motion. Free sediment transport calculator for sediment, transport, and more. It applies the calculation formula (θ = τ₀ / ((ρs−ρ)gd); θc ≈ 0.06 (Shields parameter)). For example: 2 pa shear, 0.5 mm sand — A typical use case demonstrating the calculator with representative values.