Improved Modeling of Subaerial and Subaqueous Muddy Debris Flows
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 7
Abstract
In this note, a two-dimensional depth-averaged numerical model (MassFlow2D) previously developed to simulate subaerial and subaqueous muddy debris flows is further improved. The retarding effects of ambient fluid, including shear resistance, dynamic pressure, and added mass, on debris-flow movement is considered. The critical depth is reformulated by considering the role of the earth pressure gradient of debris flow. The improved model is then validated against laboratory-measured datasets from two flume experiments and a slump test. The numerical results agree well with the laboratory datasets. Afterward, the robustness of the model is demonstrated by a schematized large-scale submarine landslide. The improved model is also applied to a more realistic field scenario with real bathymetry originating from the Northern South China Sea where historical submarine landslides occurred. The results show that resistances from ambient water have significant implications on the dynamics of failed sediments. It is observed that the earth pressure gradient of debris flow plays a major role in the stage of creep deformation.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
This research was supported by the Funds for International Cooperation and Exchange (Grant No. 41720104001) and State Key Program (Grant No. 41530966) of the National Natural Science Foundation of China (NSFC) and the Shenzhen Engineering Laboratory of Oil & Gas Drilling Equipment and Submarine Pipeline & Cable at Southern University of Science and Technology (SUSTech), China. The first author also acknowledges the postdoctoral fellowship received from SUSTech.
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 14, 2019
Accepted: Jan 13, 2020
Published online: Apr 18, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 18, 2020
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