Abstract
Submarine mudflow is one of the most serious geohazards. A new Mini-drum Centrifuge apparatus was developed for use. A series of experiments were performed to investigate the flow behaviour of submarine mud, based on the following aspects: (i) side view; (ii) change in basal pore pressure; (iii) change in water content and (iv) change in the Reynolds number. In this series of centrifuge tests in the subaqueous environment, the submarine mudflow transformed from a highly concentrated mudflow to a turbulent current at a water content of 113% to 121%. Accordingly, the Reynolds number Re, as the threshold of turbulent flow was about 1,150–2,250. Based on the water content measured before and after each test, the water entrainment during the flowing process was minimal for laminar flows, but large for turbulent flows. In addition, the evolution of basal pore pressure was found to be closely related to the regime of submarine mudflow: laminar or turbulent.
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