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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.
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