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iDEA: Drexel E-repository and Archives > Drexel Academic Community > College of Engineering > Department of Civil, Architectural,and Environmental Engineering > Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405] > A particle tracking technique for bedload motion

Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1435

Title: A particle tracking technique for bedload motion
Authors: Papanicolaou, Athanasios N.
Knapp, Doug
Keywords: Sediment transport;Fluvial hydraulics;Experimental hydraulics
Issue Date: 13-Sep-2006
Publisher: Michael Piasecki and College of Engineering, Drexel University
Citation: Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732
Abstract: Nowadays, the advances made in scientific visualization techniques have enhanced our capabilities of tracking sediment and measuring sediment rates. The focus of this study is to provide a new experimental approach to determine the displacement speed of particles rolling atop a well packed layer of spheres and provide a formula that describes the average displacement speed of particles as a function of the particles geometry and weight, settling velocity, and the frictional characteristics of flow. For this purpose, this study presents the measurements of the displacement speeds of three different sized spherical particles under varying flow conditions and bed roughness. The particles, ranging in size from 5/8 of an inch to one inch in diameter, primarily experienced motion due to rolling. The displacement speed information is required for the prediction of sediment fluxes, which can be used to model local sediment entrainment in natural gravel streams. For this purpose, a laboratory flume was used to perform 30 experimental runs. The tests were repeated 15 times, or until repeatability was established. Velocity profiles, shear stress, discharge, and bulk velocity were acquired for each run. An ADV and Swoffer were used to obtain the velocity profiles. Sediment motion was monitored using a plan view from a digital camera mounted above the flume. Individual frames depicting a particle’s motion were produced using Asymetrix DVP and Adobe Photoshop 4.0. Data translation software combined the individual frames to calculate the displacement speed of sediment motion. The results are compared with values predicted by bed load formulas developed by Sekine and Lee. Values observed in this experiment are greater than the values predicted by Sekine and less than the values predicted by Lee.
Description: Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization.
URI: http://hdl.handle.net/1860/1435
ISBN: 0977447405
Appears in Collections:Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]

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