PENGARUH PENAMBANGAN GALIAN C DI SUNGAI SOMBE DAN SUNGAI LEWARA TERHADAP SISTEM PENGENDALIAN ALIRAN DEBRIS
Sombe River and Lewara River is a torrent river where the bottom slope in the upstream is relatively steep and the debris flow could potentially occur. As a debris flow mitigation efforts, there are 6 units of check dams in the Sombe River and 2 units in the Lewara River. The development of physical...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2011
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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/90264/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=52777 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Sombe River and Lewara River is a torrent river where the bottom slope in
the upstream is relatively steep and the debris flow could potentially occur. As a
debris flow mitigation efforts, there are 6 units of check dams in the Sombe River
and 2 units in the Lewara River. The development of physical infrastructure
caused the material needs also increased. Excessive material exploitation may
cause the environmental damage (degradation) including the defect of sediment
control dam, so therefore the sediment balance management needs to be done.
This study aims to assess the sediment balance based on the estimated of
sediment flowing from the Sombe River and Lewara River upstream to the
meeting point of the two rivers (control points). The analysis of the sediment
inflow volume was approached with Takahashi (1991) and Mizuyama (1977)
empirical formula while the sediment outflow volume was approached with
Shimoda (1995) empirical formula. The balance simulation result is used to
determine the ability of existing check dam in controlling the sediment inflow
volume without mining activities and if mining activities occur.
The results obtained that the sediment balance without any mining activities
that accounted by volume of sediment inflow assuming with rainfall limit 10 mm
to 60 mm per day can lead to sediment runoff at the control points. The sediment
inflow volume that can be controlled by checkdam is 10.22% to 70.70%. In the
condition of mining activities occured, the sediment runoff developed at the
control points that accounted by volume of sediment inflow assuming rainfall
limit 10 mm to 40 mm per day. The sediment inflow volume that can be
controlled by checkdam capacity and reduced by mining activity is 23,64% to
84,23%. Optimization functions of the existing sediment control dam by returning
the storage capacity and effecting the checkdam control function can improve the
ability of structural mitigation of debris flow disaster. |
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