Sediment Accretion and Variabllity of Sedimentological Characteristics of a Tropical Estuarine Mangrove: Kemaman, Terengganu
The study on the sediment accretion and variability of sedimentological characteristics were conducted on an estuarine mangrove in the Kemaman district with the aims of determining the average annual accretion rate, the monthly accretion rate variability, sediment distribution and its variability...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1996
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/7966/1/ITMA_1996_1_A.pdf |
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| Summary: | The study on the sediment accretion and variability of sedimentological
characteristics were conducted on an estuarine mangrove in the Kemaman district
with the aims of determining the average annual accretion rate, the monthly accretion
rate variability, sediment distribution and its variability within the mangrove area.
The study was conducted over a two year period starting from September 1993 to
August 1995.
The average accretion rate for the first and second year of study were found to
be 0.66 cm/yr and 1.46 cm/yr respectively, while the average for the entire study
period was 1.06 cm/yr. Accretion rate rate was found to be higher at the front
mangrove and gradually becoming smaller towards the back mangrove. This trend
was found to be true for both the monsoon and the non-monsoon seasons.
Nevertheless, the accretion rate on the entire mangrove area was higher during the
monsoon months compared to the non-monsoon months. Sedimentologically. the surface sediment of the Kemaman mangrove consists
of sediment ranging from very fine sand to medium silt. The surface sediment tended
to become finer, better sorted and more positively skewed towards the back
mangrove. The average of mean size of surface sediment was found to be 4. 17 phi
(coarse silt). The average of standard deviation, skewness and kurtosis of the surface
sediment were 1.99 phi (poorly sorted), 0.05 (symmetrical) and 2.33 phi (very
leptokurtic), respectively. While the parameters of mean size and skewness do not
differ between the monsoon and the non-monsoon seasons, the parameters of standard
deviation and kurtosis tended to become better sorted and more peaked respectively
during the monsoon season.
The higher accretion rates indicate that the Kemaman mangrove is still in the
process of finding an equilibrium level with the major environmental forces affecting
it. It is also interesting to note that the accretion rates during the monsoon season are
significantly high compared to the non-monsoon season indicating the role of the
monsoon in supplying sediments to the mangrove area. |
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