| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 98 === There have serious problems of overpumping of groundwater in the
coast area of the western Taiwan, especially in Yunlin area which has the
most subsidence area and the serious subsidence rate in Taiwan. If
subsidence keeps growing, it will make the supply and demand of
groundwater unbalanced, cause heavy subsidence and affect the
geo-engineering constructions of the country.
The purpose of this thesis is to study the amount of land subsidence
in Yunlin area. The numerical simulation groundwater flow software
MODFLOW is applied to construct numerical models of groundwater
flow at Chou-Shui alluvial fan. By setting hydraulic parameters, the
combined hydrological model with the code (Interbed Storage Package)
can be built the model of land subsidence in Yunlin. Then we evaluate the
difference in amount of land subsidence under three types of water level
observation data, average water level of the month (model 1), the highest
water level of the month (model 2), and the lowest water level of the
month (model 3). Finally, the difference between collected data and the
simulation results of the land subsidence is compared.
As compared between field measurement data and simulation results
with three models, it indicated that the trend of simulation results of the
land subsidence corresponds to the filed measurement of land subsidence.
In subsidence stations in inland area of Yunlin, such as Yuan-Chang
elementary school, Hu-Wei elementary school and Ke-Tsuo elementary
school, simulation results of subsidence in model 1 had more accurate
results of subsidence compared with field measurement. In subsidence
stations such as Jian-Yang elementary school and Jin-Hu elementary
school of southern coast, simulation results of subsidence in model 2 had
better correction results of subsidence. In subsidence stations of northern
III
coast area such as Lun-Feng elementary school, Shin-Shing elementary
school, Lung-Yan elementary school and Feng-An elementary school,
simulation results of subsidence in model 3 had better correction of
subsidence.
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