Introduction
The characteristics of tidal pressure waves, i.e. their velocity,
amplitude, wavelength and attenuation, are a function of the
tidal period and amplitude, the aquifer’s transmissivity and
storage coefficient, and the distance inland (Erskine, 1991).
The phreatic surface responds to local leakage through the
shoreline structures, which in turn affects the characteristics
of the pressure waves as they propagate into the aquifer.
This paper describes the effects of shoreline boundaries in
the estimated hydraulic conductivity (K) of an aquifer using
the tidal dampening method.
The aquifer is bounded by a concrete open drain to the
western landward side, a supported shoreline to the north
and south and an unsupported shoreline to the east as shown
in Figure 1. The aquifer has been characterized through
analysis of borehole logs, cone penetration tests (CPT) and
soil coring. The results indicate that the aquifer comprises of
coarse sand fill ranging between 7 to 15 m thick. The water
table slopes towards the sea in the north, east and south
directions, and towards an open drain along the inland
boundary of the reclaimed land.

Authors:

Tay Joo Hwa (cjhtay@ntu.edu.sg) • Tan Soon Keat (ctansk@ntu.edu.sg)
Lawrence Koh (CCCKoe@ntu.edu.sg) • Shuy Eng Ban (cshuyeb@ntu.edu.sg)
N Mzila (cnmzila@ntu.edu.sg) • Lloyd. Chua (CChua@ntu.edu.sg)
Yee Woon Kang (cwkyee@ntu.edu.sg) • Wong Kong Chue (ckcwong@ntu.edu.sg)
Fung Eng Wei (cewfung@ntu.edu.sg)

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