Sedimentation Dynamics of a Small Hill Forest Catchment in Ulu Langat, Selangor, Malaysia
This study assesses the sedimentation dynamics of a small hill forest catchment with an area of 2.6 km² in Ulu Langat Forest Reserve, Selangor, Malaysia. The study catchment was equipped with rainfall and water level recorder to assess the hydrological characteristics of the area. The annual rai...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2000
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10031/1/FH_2000_14_IR.pdf |
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| Summary: | This study assesses the sedimentation dynamics of a small hill forest catchment with an
area of 2.6 km² in Ulu Langat Forest Reserve, Selangor, Malaysia. The study catchment
was equipped with rainfall and water level recorder to assess the hydrological
characteristics of the area.
The annual rainfall data recorded during the study period from July 1997 to June 1998
was 2051.6 mm. The maximum monthly rainfall of 431.4 mm was recorded in October
1997 while the minimum of 25.1 mm occurred in February 1998. In October-December of 1997 and May-June of 1998, high rainfalls were observed due to inter
north-east monsoon and transition monsoon respectively.
Sedimentation dynamics in the study area was evaluated using the Helley-Smith bed
load sampler and a two-weekly survey of stored sediment. Bed load was estimated
using a bed load-rating curve and discharge time interval of half-hourly, hourly and
daily mean values, there are the annual bed load was 4.61, 4.46 and 3.81 t respectively
which presented about 17.0% of the total load.
Sediment deposition measurement was conducted fortnightly over a year showed the
high sediment transported during two storms events. The sediment deposited about
3.064 t and 2.033 t during of 19 October to 1 November 1997 and 14 - 27 June 1998,
compared with the annual load of 11.36 t, for the study period were transported.
The bed load particle size distribution is measured in order to determine the quality of
the sediment transported. A wide range of particle size was observed. This ranged from
0.05 to 0.9 mm at D₅, 0.35 to 3.1 mm at D₅₀ and 0.75 to 5.1 mm at D9S with average of
0.24, 1.1 and 2.16 mm, respectively.
Sedimentation dynamics was evaluated based on the bed load and sediment storage in
the Sg. Pangsun watershed. High sediment loads were transported during storms, the
proportion of the bed load and sediment storage load was year total: bed load versus
sediment storage. |
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