|
The objective of the study is to analyze the possible causes of the salinization of the shallow ground water in the coastal area of Yun-Lin. By using the geological drilling data and sea floor topographic distribution, thelocal hydrogeological setting is first construct. Three possible causes including sea water intrusion,salt water percolation through wells and infiltration of salty water from fishfarm are then investigated. The chlorideconcentration is selected as an index of ground water salinization.The seawater intrusion is modeled by the advection - dispersion equation,salt water infiltration from wells and fishfarm are calculated by the amount of water percolated . From constructed local hydrogeological setting it suggestedthat the shallow aquifer may be interconnected to the sea water and will caused saltwater intrusion if large amount groundwater is over pumped. The percentage of salinization of shallow aquifer at Kou Hu in Yun-Lin coastal area caused by seawater intrusion,well percolation and fishfarm infiltration are 26.7, 0.7 and 72.6%,respectively. The result suggest the vertical infiltration of saltwater is the major cause of the ground water salinization and salt water infiltrationfrom fishfarm is the major vertical infiltration factor of shallow ground water salinization in the coastal area of Yun-Lin.
|