STUDY OF SEDIMENT CONTROL ON BANGGA RIVER, PALU SUB-WATERSHED, PALU LARIANG RIVER BASIN
Bangga River is one of Palu's tributaries, located in a mountainous area in Palu River Basin (DAS) with an area of 74.82 km2 and has a river length of 16.97 km. Bangga River is a source to meet daily needs, including agricultural land and plantations. However, floods occur frequently which i...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/62887 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Bangga River is one of Palu's tributaries, located in a mountainous area in Palu
River Basin (DAS) with an area of 74.82 km2 and has a river length of 16.97 km.
Bangga River is a source to meet daily needs, including agricultural land and
plantations. However, floods occur frequently which is mainlyexerted by the silting
of sediment. The silting of sediment itself is contributed by the landslide on the
upstream of the Bangga River. This proofs that the cliffs upstream of Bangga River
are quite unstable, which can be collapsed easily due to the disaster. This statement
was proven in 2018 that the earthquake and rainfall with a duration of 6 hours on
the downstream area of the Bangga River, with the approximated water depth of 3
m, and was generating enormous losses. The losses is regarding the settlements,
offices, and infrastructure.
Considering the similar condition that would be happening in the future, the
Ministry of Public Works and Housing developed the sediment control through the
construction of the Sabo dam inline the Bangga River. Hence, this study aims to
analyze the performance of sabo dam in reducing the yields of sediment. Analysis
and modeling will be carried out into two scenarios, before and after the sabo dam
structure. The design is based on 100 years of return flood discharge and a flow
rate of 4 years. Modeling uses HEC-RAS software with purposeful 1D modeling to
simulate flow patterns, total sediment before and after the sabo dam structure's
sediment control building.
According to the HEC-RAS simulation, shows that the water surface is stood at 2.1
m depth in existing condition. However, the simulation indicates low discharge
(run-off) subsequent to the constructed after sabo dam’s building. Meanwhile, the
amount of sediment in downstream is also reduces from 409709 ton/ 4 years to
108194 ton/ 4 years and 76383 ton/ 4 years. So that, it can be understood that the
sabo dam not merely functioned to hold the sediment but can also reduce the
flooding. |
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