The numerical scheme of the advection term should be designed correctly for the fronts of sharp concentration gradients to prevent excessive numerical diffusion or dispersion when calculating mass transport in the areas of estuary and coast.

• 用数值模式对河口海岸地区的物质输运进行计算时,平流项的数值格式必须要能正确处理物质浓度锋面,以避免产生过多的数值耗散或频散。