The Variation of Riverbed Material due to Tropical Storms in Shi-Wen River, Taiwan

Figure 12

Shields number versus Froude number for Shi-Wen River using 10-year return period. (𝜏_𝑏/(𝛾_𝑠−𝛾)𝐷), in which 𝜏_𝑏 is bed shear stress, 𝛾_𝑠 and 𝛾 are sediment and fluid densities, respectively, and 𝐷 is the grain size to be moved multiplied by acceleration due to gravity. The parameter (𝑈/𝑔ℎ) represents the Froude number, in which 𝑈 is the flow velocity and 𝑔 and ℎ are the acceleration due to gravity and flow depth, respectively.