Study on Dynamic Model to Simulate Seawater Intrusion Into Meizhai at Jiuzhen of Zhangpu

A simplified dynamic model is used to simulate seawater intrusion into Meizhai at Jiuzhen of Zhangpu and to expound seawater intrusion tendency there.Then the measures are proposed to slow down the seawater intrusion rate and to prevent from the intrusion.Also the seawater mineralization degree is predicted for a monitoring station.As it is shown in the modeling results,it takes 8 years to slow down the intrusion rate and for the mineralization degree to becomes 6.2430 g/L.These results means that it takes a long time to recover the water quality once the seawater has been intruded.If fresh water from a source with its flow head as much as 6.2 units has been addied to the intruded area,it takes about 1 year for the intruded seawater to be refreshed.Therefore a fresh water source is helpful to quickly prevent from seawater intrusion.If the 1∶1 proportion of the fresh water level to the seawater level is maintained,the seawater intrusion will not become worse.This study might provide scientific basis for reasonable exploitation of underground water.In addition,it is learnt from the prediction results for the mineralization degree at the monitoring station in the period form April to August 2010 that the dynamic prediction method can predict the seawater intrusion more precisely than the static prediction method,and it is more effective to issue the seawater intrusion warning.