Research on the distribution of debris flow impact on the upstream surface of the check dam.

From working condition A 1 B 3 C 2 to working condition A 1 B 3 C 5 , the mean value of the impact force of debris flow shows an increasing trend with the increase of bulk density.

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It can be seen from Figure S4 that from working condition A 1 B 3 C 2 to working condition A 1 B 3 C 4 , the mean value of debris flow impact force shows a nonlinear increase trend with the increase of debris flow bulk density; from working condition A 1 B 3 C 4 to working condition A 1 B 3 C 5 , the mean value of debris flow impact force shows a decreasing trend, mainly because the bulk density of debris flow increases, the viscosity coefficient increases, and the velocity of debris flow decreases.

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