A STUDY OF POLLUTANT MIXING AND EVALUATING OF DISPERSION COEFFICIENTS IN LABORATORY MEANDERING CHANNEL
General behaviors based on hydraulic characteristics of natural streams and channels have been recently analyzed and developed via various numerical models. However in the states of natural hydraulics, an experimental research should be performed simultaneously with the mathe matical analysis due to effects of hydraulic properties such as meander, sediment, and so on. In this study, to fred effects of hydraulic characteristics and evaluate longitudinal and transverse coefficients using 2-dimensional advection-dispersion equation in meandering channels, a laboratory experimental channel has been set up with 2 S-curved sections. In addition, results of the experiments have been compared with velocity fields of same hydraulic conditions. From the analysis of the pollutant clouds illustrated from the results of tracer tests, separation, stagnation, and superposition of several pollutant clouds have been occurred from asymmetric velocity fields and effects of the secondary flow which can be estimated with using SCI (secondary current intensity). Specific relationships between hydraulic properties such as ratio of width to depth, Froude number and flow patterns with dispersion coefficients which can be well-expressed could be elucidated with 2-D routing procedure.
meander longitudinal and transverse coefficients 2-dimensional advectiondispersion equation pollutant clouds SCI (secondary current intensity) 2-D routing procedure
Il Won Seo Sung Won Park Hwang Jeong Choi
Dept.of Civil Engineering, Seoul National Univ.Korea Dept.of Civil and Environmental Engineering, Seoul National Univ.Korea
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
485-490
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）