Estimation of soil loss from the upper Rajang sub-catchments in Sarawak, Malaysia during the developement of the Bakun hydroelectric project
Changes in the land use and land cover; especially biomass remoual. timber harvesting and agricultural activities in the Balwn catchment during the development of Bakun Hydro-electric Project (HEP) have resulted in considerable soil loss from the area. The objective of this study is to estimate s...
محفوظ في:
| المؤلف الرئيسي: | |
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| التنسيق: | أطروحة |
| اللغة: | English |
| منشور في: |
2005
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| الموضوعات: | |
| الوصول للمادة أونلاين: | http://ir.unimas.my/id/eprint/14836/8/Vu%20Ngoc%20Chau%28full%29.pdf |
| الوسوم: |
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| الملخص: | Changes in the land use and land cover; especially biomass remoual. timber
harvesting and agricultural activities in the Balwn catchment during the development
of Bakun Hydro-electric Project (HEP) have resulted in considerable soil loss from the
area. The objective of this study is to estimate soil loss from the Upper Rajang SubCatchment
during the development of the Bakun HEP by using sediment rating curve.
Rating curves were constructed for six scenarios using TSS and water level data
collected during a field work and those compiled by the Sarawak Hidro Sdn. Bhd.
Suspended sediment yields in the catchment were calculated bQJ3ed on equations
created from the rating curve and water level data for 2003 and 2004. Sediment yield
is taken to be the sum of suspended sediment yield and bed load, the latter being
estimated as 20% of sediment yield. The results for suspended sediment yields for the
'best fit' scenario were 36.87 and 40.20 million tonnes in the year 2003 and 2004
respectively. Taking into consideration the bed load contribution, the annual sediment
yields in the catchment were 46.09 and 50.25 million tonnes respectively. The result in
this study is not very different when compared with the results of an earlier estimated
reported in Bakun HEP EIA (I 995). Estimation of soil loss and sediment yield in the
catchment is relevant to the overall assessment of the effects of the project development.
Appropriate mitigation measures to minimize the soil erosion and sediment yield on
the drainage system, especially the effects to the reservoir in the future, were also
highlighted in this dissertation. |
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