mag

Malaysia Water Research Journal
d) e) f)
Figure 8. The average rate of bed level change for projection at year a) 2020,
b) 2060, c) 2100 and average bedload for projection at year d) 2020, e) 2060
and f) 2100 the Kuala Pahang estuary.
Table 4. Sediment transport analysis
Sea Level Rise
Average Rate
of bed level
change (m/
dy)
Average Bed
load (m3/
s/m)
No Sea Level
Rise (2014)
Low Sea
Level Rise
(2020)
Moderate
Sea Level Rise
(2060)
High Sea
Level Rise
(2100)
- 0.034 m 0.144 0.307 m
-0.03 – +0.3 +0.2 +0.4 +0.6
0.0002 0.0003 0.0004 0.0008
5 CONCLUSIONS
This study shows that rising sea levels obviously influenced the hydrodynamic
pattern at the Kuala Pahang. Increasing sea level consequently produced
faster current speed, in particular at the left bank of the estuary. This promotes
sediment entrainment and increasing the erosion rate at this area. However,
due to the complexity bed morphology of Kuala Pahang, where existing formed
sand bars influenced the current speed to be much lower, in particular at the
right bank of the estuary. Lower flow velocity promotes sediment deposition
which subsequently a formation of new land may be expected. Therefore, it is
concluded that rise in sea level will increase the water level at the river estuary
due to backwater effect and changes in the hydrodynamic patern change the
place of sediment deposition which might lead to river flooding.
Institut Penyelidikan Hidraulik Kebangsaan Malaysia (NAHRIM)
25
National Hydraulic Institute of Malaysia (NAHRIM)