## Additional sediment transport equation in Sisyphe

Though Sisyphe already includes a great number of sediment transport equations, I added an extra equation that performed quite well in the past. It's the equation of Cheng (2002) which is an exponential formula that does not involve the concept of the critical shear stress. So it is suitable for low as well as for high shear conditions.

The following picture shows a comparison between the formula of Cheng and the formulas of different other authors that represent conditions of high, moderate and low shear stress:

The formula itself is quite simple:

The equation can be found in bedload_cheng.f in my gitorious repository. It can be used by setting the transport equation number to 20.

Have fun!

Literature:

Cheng, Nian-Sheng: Exponential Formula for Bedload Transport, Journal of Hydraulic Engineering, 2002.

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