Table 6 Function relations between the Darcy-Weisbach resistance coefficient (f) and gravel coverage degree (Cr) and flow discharge (Q).

From: Effects of Simulated Gravel on Hydraulic Characteristics of Overland Flow Under Varying Flow Discharges, Slope Gradients and Gravel Coverage Degrees

Cr

Equation

R2

NSE

n

 

Cr = 0%

\(f=10.540{Q}^{-1.003}\)

0.748

0.748

40

(20)

Cr ≠ 0%

\(\,f=10.638{(1-Cr)}^{-2.929}{Q}^{-0.699}\)

0.840

0.840

120

(21)

All slopes

\(\,f=8.461{(1-Cr)}^{-3.652}{Q}^{-0.701}\)

0.841

0.841

160

(22)

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