IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : Lagrangian Particle Tracking Technique for Analysis of 2D Mixing in Natural Streams
Lagrangian Particle Tracking Technique for Analysis of 2D Mixing in Natural Streams
Author : Il Won Seo, Inhwan Park, Young do Kim and Hyun Saing Mun
In Nakdong River which is located at Republic of Korea, a number of globular shape GPS floaters were spread for analysis of the floating pollutant mixing which has the highest percentage among water pollution accidents. GPS sensor in a floater recorded its position at every 3 seconds in longitude and latitude coordinates. GPS floaters traveled downstream about 700 m for 90 minutes and then collapsed to the left bank due to the local flow structure at the water surface. The LPT model was used to represent the field experiment. After converting the longitude-latitude coordinates of measured data into the TM coordinate, the particle positions of both field experiments and simulation results were plotted in the scatter diagram and determined the dimensionless horizontal diffusion coefficient as 0.17. Using the conversion code developed in this study, the particle position information was converted into the concentration distribution to analyze the mixing characteristics of the tracer cloud at the water surface. The comparison of measured and simulated concentration distributions showed that the peak concentrations of the simulated results were similar with the experimental results. Span-wise diffusion of particles showed that both the experimental results and the simulation results approached to the left bank where the Bonri pumping station is located. Therefore, the proper disaster protection measures are necessary on the left bank of downstream of the Samunjin Bridge when the floating pollutant is spilled at this area.
File Size : 1,771,971 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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