Dry granular dam-break flows over erodible sloping deposits: experiments and depth-averaged modeling
Date Issued
2016
Date
2016
Author(s)
Wang, Chih-Chung
Abstract
In this thesis, a set of experiments of instantly dry dam-break granular flows to downstream erosion of the erodible deposits, and numerical simulation, are presented. In the experiments, the channel is 270 cm long, 4.2 cm wide. For the initial conditions, channel is designed to be variable-angle and features of removable type boundaries, and it can provide the variety of inclination angles and different types of boundaries to discuss the experiments. We use the glossy mill stones of 2.5mm to simulate the dam-break granular flow, and use particle tracking velocimetry (PTV) method to calculate the velocity field and the path of granular flows. Moreover, we calculate the accumulative flow rate of each section to define the lines of surface and bed-load. Furthermore, it can be compared with the results of numerical solutions. In theory, we take mass, momentum and kinetic energy equations as a basis, and use depth-integrated equation to derive the governing equations in depth-averaged modeling. Next, we use HLL scheme and finite volume numerical method to solve the equations. Finally, we take the result of numerical solutions to compare with the image analysis of experiments to observe the phenomenon of differences.
Subjects
dam-break
erodible deposits
particle tracking velocimetry
depth-integrated equation
finite volume method
Type
thesis
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