| Summary: | 碩士 === 國立中央大學 === 地球物理學系 === 84 === Direct current resistivity soundings were carried out in the
coastal plain between Peikangchi and Tsengwenchi, southwestern
Taiwan, Incorporating of the sounding data with the geological
well information and pumping test results was used to discuss
the features of the electrostratigraphic unit and paleo-
depositional environment. The sounding data were also used to
map the aquifers and evaluate the transmissivity at the
sounding points without well information. Based on the final
results of this research, some conclusions are drawn as
following : 1. The distribution of the electrostratigraphic
units indicate that the major sedimentary materials in Chiayi
and Tainan county are different; the former is dominated by
sandy deposits and the later by muddy deposits. Therefore, the
potential of aquifer in the north part of the survey area is
better than that in the south part. 2. Depositional environment
in coastal plain was affected greatly by the past transgression
and regression. In general, the residual salinity is still
remained in the subsurface along the southwest of Chianan
coastal plain. 3.The original course of Tsengwenchi flowed
toward Chiali, it was located to the north of the present
location of Tsengwenchi. This buried channel were recognized by
the high resistivity zone shown in the vertical sections. 4.The
depths of main aquifer in the study area were ranging from 50
to 80 meters except those in the Dalin county. The depth is
increased toward southwest. 5.Correlation was made between
hydrogeological and electrical parameters, empirical relation
between two parameters was then established, the transmissivity
at each sounding location without well information can thus be
figure out from this relation.
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