![]() Temporal variations of the debris flow density can have two chronological orders: (a) dilute-viscous-dilute debris flow and (b) viscous-dilute debris flow. During the decreasing debris flow, the flow density reduces with reduction of the flow discharge, indicating the important role of the flow discharge in changing the flow density as a driving factor. ![]() The phase separation mechanism of natural debris flows is analyzed based on the mentioned experimental and field observations. A number of experiments are conducted to study the phase separation mechanism of debris flows, and the characteristics of their depositions over deceleration baffles with varying flow density and bottom slopes. In this paper, the relationship between debris flow discharges and densities is studied based on the field observations of the Jiangjia Gully, China. The phase separation mechanism in a natural debris flow as a solid-liquid mixture is an important aspect in its movement and deposition.
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