Mixing and transport

摘要: The International Symposium on Environmental Hydraulics was held in Hong Kong December 1991 and produced a two volume proceedings.1 proceedings include over 200 papers, most related to mixing transport. Conference sessions cov ered such topics as jets plumes, ocean outfalls, turbulent mixing, dispersion, sediment transport, stratified flow, modeling. annual American Society of Civil Engineers National Hydraulic Engineering Nashville, Tennessee, July August ? Sessions pertinent mix ing transport addressed field measurements dispersion rivers, water-sediment interface processes, thermal discharges, estuary modeling, oil spills, water quality hydraulics. Frankel Brenner3 extended generalized Taylor theory unbounded homogeneous shear flow. Using coor dinate system that deforms with the they derived convective-dispersion type solution for solute Smith4 analyzed influence wind buoyant slightly dense particles shallow water. He found concentrating action downwind movement coun teracted by increased thus explaining lack cor relation between onshore winds shoreline pollution. Komori et al5 considered dynamics reacting species injected at separate points flow field. They used model evaluate "unmixedness" parameter, measure effects mean chemical reaction rate. Borgas Sawford6 revised previously formulations statistical properties oneand two-particle dis persion. New relations one-particle Lagrangian acceler ation correlation acceleration covariance were inertial subrange. Squires Eaton7 evaluated heavy Through numerical simulations, deter mined how drift due body forces inertia changes diffusion particle from neutral particle. Mei al* mathematically Basset gravitational particles. affect but not structure fluid velocity fluctuations. Yang al9 presented new higher-order technique advection-diffusion equation. method tracked advection characteristics inter polated concentration its derivatives using polynomials. Kerstein10 reported linear-eddy approach modeling wide range length scales. modeled molecular deterministically su perimposed stochastic turbulence-induced diffusive movements. Pai Tsang11 proposed second-order closure turbulence solved finite elements. tested their against laboratory, wind-tunnel, large-eddy simula tions model's parameter sensitivity. Li12 developed solve two-dimensional advection-dis persion equations split-operator scheme. advective step minimizing error solution; an alternating direction explicit method. Ernest al13 estimation algorithm advection-dispersion dye clouds mixed laboratory columns.