KAJIAN SEDIMEN TRANSPOR DAN PERUBAHAN MORFOLOGI SUNGAI OPAK PASCA ERUPSI GUNUNGAPI MERAPI TAHUN 2010
Opak River is one of main river located on Merapi Volcano flank flowing sediment material source from eruption product. Sedimentation process can extend either benefit or loss impact for environment. Morphologycal component of river can change by presence of sediment source and influence on agradati...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2014
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| Online Access: | https://repository.ugm.ac.id/129437/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=69828 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Opak River is one of main river located on Merapi Volcano flank flowing
sediment material source from eruption product. Sedimentation process can
extend either benefit or loss impact for environment. Morphologycal component
of river can change by presence of sediment source and influence on agradation
and degradation of base flow. Objectives of this research were : explaining the
spread of bed load material on Opak River at some partial elevation, analizing
suspended sediment concentration transported at both flooding and normal flow
condition, and determining morphologycal changes with appeal condition before
and after 2010 Merapi Volcano eruption.
Type of this research was observational research. It was designed with the
graph, descriptive, and statistic analysis. Sample which had been monitored were
at five observation area of Opak River fragment. They were sediment
concentration flowed in river stream, flow discharge, and bed load material
which spreaded on river fragment.
Result of this study examined disavowal with hypothesis that in higher
elevation would bigger in material size. In that case, the existence of Sabo DAM
along Opak River had possesed bed load material spreading. Suspended sediment
rating curve at normal flow at three observation area as follow : Cs=1,012
(Q)0,034 , Cs=1,033 (Q)0,023, Cs=1,043(Q)0,00357. At flood condition, daily sediment
discharge rate was 111,4 ton/day for flooding in January, and as much as
1800,46 ton/day for flooding in February. Result equivalent of river cross section
year 2000 and 2013 in Ngablak Village showed some changes although they were
not significant. That changes were degradation at right side of channel, and
agradation at left side and middle of channel. Efforts necessary to be done in
Opak River management are : monitoring river stream condition periodically and
taking some material along the stream in order to flowing water unavoidably
through the stream. |
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