APPLICATION OF LARGE SCALE TURBULENT SIMULATION FOR WATER QUALITY MODELLING OF THE YANGTZE RIVER

Large scale turbulent structures play an important role in mass transport of natu-ral river turbulence diffusion,After adopting the theory of Large Scale Turbulent Simulation tonatural rivers,some 1-D stream quality models,such as QUAL-Ⅱ,have been widely applied tolarge,middle and small rivers in China with reasonable success.Moreover,on this basis,2-Dand 3-D river quality models have also been developed.Both 2-D and 3-D models used upwindscheme plus Peaceman-Rachford’s alternating scheme in the first one and Douglas’scheme inthe second one.These models have also been successfully applied to the Yangtze River as well assome middle and small rivers in China.