| Summary: | 碩士 === 中原大學 === 土木工程學系 === 88 === In Taiwan, The demand for water resource has led to many serious problems and water resource also has not equally distributed. Many places solve the shortage of the water by withdrawing groundwater. As a result, the storage of the groundwater decreases day-by-day, and groundwater table drop off. This kind of situation is especially serious in Ping-tung coastal areas. Now Ping-tung faces land subsidence, seawater intrusion, and soil salinization
This study uses a three-dimension groundwater flow model, MODFLOW developed by USGS, to simulate the groundwater state of Ping-tung coastal areas. Then by using another three-dimension transport model, MT3DMS simulate chloride concentration in coastal areas. Based on the result of the simulation, the effectiveness of artificial recharge method in improving seawater intrusion can be evaluated.
The results of simulation shows, the zero water-table areas in Ping-tung coastal areas were extensive, and chloride had moved to inland. The problem of seawater intrusion escalated. The study uses artificial recharge wells; recharging groundwater in coastal areas to form continues pressure head. If water can constantly being recharged, the poor condition, can be improved and the land-value will increase.
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