Experiments and numerical simulations on transport of dissolved pollutants around spur dike

The flow field around spur dike is with three-dimension characteristic. To analysis the influences of the flow field on pollutant transport, based on compressive VOF scheme, the 3D transient compressive pollutant transport model CPTM and CE bounded differencing scheme were developed. For the calibration and validation of CPTM, laboratory experiments were carried out in a flume with a non-submerged spur dike. The spur dike was angled at 60, 90, and 120ο to the upstream. The simulations agreed with the experiments very well. The simulations and experiments showed that the distribution of pollutant concentration is decided by circumfluence and main flow. Concentration decay in circumfluence zone is slower than that in main flow. Behind of the spur dike,the concentration fluctuation increases with the increasing of spur dike angle.