Browsing by Subject "Debris Flow"

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    Debris Flow Flume [2009]
    (2024-05-23) Hsu, Leslie; ctn@umn.edu; Nguyen, Charles; National Center for Earth-Surface Dynamics (NCED)
    A 4-meter diameter, 80-cm wide rotating debris flow flume was constructed at the University of California Richmond Field Station for studying large-scale granular flow phenomena. This dataset covers the experiments conducted in 2007 and 2008, where the primary goal was to study rates and mechanisms of bedrock erosion by debris flows. The following data will be posted at the NCED Repository: (Please see the temporary folder for now: https://docs.google.com/folder/d/0B5JYwkWgsLhRSDl5aGRUd2lYVG8/edit ) 1. Master list of experiments 2. Force plate data 3. Laser profile data 4. Erosion topography data 5. Videos 6. MATLAB scripts Last updated 2012/07/15 *** 1. 01-debrisflow_mastertable.xls lists the experiment number, unique ID (YYMMDD), description, effective diameter, and bulk flow velocity. 2. to be deposited 3. to be deposited 4. to be deposited 5a. Debris Flow Flume videos 05a-debrisflow-drum-videos.zip: ,asf videos (can be played with the VLC player:http://www.videolan.org/vlc/) labeled as YYMMDD-MMSS_start-MMSS_end. 5b. Granular Flow and Debris Flow Video Examples 05b-debrisflow-drum-videos.zip: These are .wmv files of field and laboratory granular flows and debris flows. The purpose of these videos is to show the great range in behavior of granular and debris flow. Videos were taken at the Illgraben Torrent, (a debris flow channel in Switzerland), in the large rotating debris flow flume (Big Wheel) at the Richmond Field Station, University of California, Berkeley, and in the small rotating debris flow flume (Maytag) at the Richmond Field Station. 6. to be deposited For more information contact: hsu.leslie@gmail.com
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    Laboratory Debris Flow Experiments: A Study of Erosion
    (2018-08) Maki, Laura
    We investigate the dependence of net erosion on grain size distribution in experimental debris flows and erodible beds. We systematically and independently varied the composition of each the supply and erodible bed material and the flume inclination angle, ϕ. Then, we demonstrate that there is a unique neutral angle, ϕN (the angle at which erosion is equal to zero), for each bed and supply composition combination. We show that for each system, total net erosion increases roughly linearly with increasing ϕ and can be predicted based on ϕ-ϕN and the geometry of the erodible bed. Our other macroscopic findings include that ϕN is dependent on both the compositions of the bed and the supply; as davg,S increases, ϕN decreases; as davg,B increases, ϕN increases; and as davg,S/davg,B increases, ϕN generally decreases. We then consider particle scale dynamics that drive these macroscopic results including segregation mechanisms, inter-particle collisions, and relative roughness.