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Pages: 829-836
Year: Issue:  4
Journal: Oceanologia et Limnologia Sinica

Keyword:  salinitynumerical simulationQiantang Rivermacrotidal estuaryriver bend;
Abstract: Saltwater intrusion into macrotidal estuary is harmful to the water quality of the drinking water source.Based on a two-dimensional hydrodynamic salinity model,the progresses of hydrodynamic and saltwater intrusion of typical macrotidal Qiantang River estuary were numerically simulated.It is found that salinity curve has a similar characteristic to the tide level curve at low water runoff,and the tidal range has a great impact on the salinity.However,increase of run-off reduces the similarity gradually.Once the run-off exceeds a certain amount,the impact on saltwater intrusion suppression by run-off increase is reduced,thus the effective rate of water resource utilization is reduced too.Meanwhile,chose a freshwater reservoir instead of Qiantang River as the water source,which could effectively save the water resource.Two-dimensional distribution of salinity shows that rising-tide mainstream line has a great effect on the saltwater intrusion in the bend of a macrotidal estuary.The river bank near the mainstream line has greater salinity than the other parts.Therefore,considering only saltwater intrusion,freshwater intake in river band of a macrotidal estuary should be located away from rising-tide mainstream.The Qiantang River salinity numerical simulation could provide a guide for research on reducing damage by saltwater intrusion to drinking-water source.
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