Numerical Investigation of the Morphological Dynamics of a Step-and-Pool Riverbed Using DEM-MPS
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 1
Abstract
In mountain streams, riverbeds with a series of coarse gravel steps are common. The sequence flow pattern with a chute and pool is usually formed on series of steps, where a transition region from supercritical to subcritical flow appears between steps. In the transition region, a discontinuous water surface with hydraulic jumps is observed and considerable water surface fluctuations occur. These fluctuations significantly affect the bed material. Accurate measurement of the flow velocities under such violent flow conditions is difficult owing to shallow water conditions, air entrainment, and flow nonlinearity. Therefore, detailed flow structures around the steps were not previously understood. To conduct dynamic investigations of formation/collapse processes of the series of steps, numerical simulations were conducted using the discrete element method (DEM) and the enhanced moving particle semi-implicit (MPS) method. Simulation results suggest that the developed DEM-MPS coupling model will be a promising tool to investigate the morphological dynamics of the step series. Furthermore, the potential relationship between water surface elevation and the collapse of steps is implied by the simulation results.
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Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 1 • January 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 7, 2016
Accepted: Jun 23, 2017
Published online: Nov 11, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 11, 2018
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