Numerical simulation of water environment for Shaoxing sewage into Cao’e estuary

A large amount of sewage above the standards drain into the Cao'e estuary,making highly pollution in the estuary.To seek the effects of effluent sewage on water quality in the estuary,a 2-D depth-average mathematical model is used to calculate the distribution of water quality on the two cases of effluent sewage up to and above the standards.The results show that the water will be contaminated and the water quality above the fifth class occured if effluent sewage is above the standards, and satisfy to the territorial request of the third class water quality function if effluent sewage is up to the standards.Therefore it is very important to controll Shaoxing effluent sewerage for protecting the water quality in Cao'e estuary.