mag

4 RESULT AND DISCUSSION
4.1 Field Measurement
Malaysia Water Research Journal
The highest speed measured during the measurement period at the observed
location A and B, respectively were 0.33 m/s and 0.25 m/s. While the lowest
reading for the measured current speed were 0.03 and 0.04 m/s. Analysis of the
observed data for the current direction showed that the current flows in the 200⁰
and 10⁰ directions in location A and while the dominant flow is at 320⁰ and 180⁰
in location B. Wave data analysis showed the dominant wave direction is 80⁰ to
120⁰ in location A and 120º to 140º at location B. Location A indicates the wave
height up to 0.4 m while the maximum wave height at location B exceeded
0.6 m. Contours show the mainland area has heights exceeding 7.5 m and the
sea has depth exceeding 25 m towards offshore and become shallower when
approaching the coastline.
4.2 Historical Bed Level Changes
Analysis of the 2014 bathymetry data found that the depth of the seabed
in Pekan water is between 1.18 to 16.1 m according to the lowest chart datum.
Comparisons between 62 years data (that is the 1952 and 2014 map) indicate
the study area has experienced changing in depth between -0.08 to 2.9856 m.
The majority of the areas experience increasing depth which indicates erosion
while northern Kuala Pahang suffered reduction in depth which demonstrates
deposition. Figure 6 illustrates the changes of bathymetry within the span of 62
years.
Figure 6. Changes of the bathymetry depth over 62 years
Institut Penyelidikan Hidraulik Kebangsaan Malaysia (NAHRIM)
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National Hydraulic Institute of Malaysia (NAHRIM)