SIMULASI 1-D BANJIR AKIBAT KERUNTUHAN BENDUNGAN DENGAN PROGRAM HEC RAS 4.1.0. Studi Kasus Embung Tambakboyo Kabupaten Sleman � Propinsi D.I. Yogyakarta
Based on the Indonesian Government Regulation No. 37 on 2010 about Dams, then any dam could potentially lead to catastrophic are required to have Emergency Action Plans (EAP) in case to take the necessary action if there is any failure or dam failure occurs. One of the storage that be analyze locate...
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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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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/128454/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=68799 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | Based on the Indonesian Government Regulation No. 37 on 2010 about
Dams, then any dam could potentially lead to catastrophic are required to have
Emergency Action Plans (EAP) in case to take the necessary action if there is any
failure or dam failure occurs. One of the storage that be analyze located in urban
areas are Embung Tambakboyo. It located in Tambakboyo meandering river in
the Subvillage Tambakboyo, Village Wedomartani, Ngemplak Subdistrict,
Sleman District, Yogyakarta Province.
The reservoir has an area of inundation 56.062,61 m2 and 366,881.81 m3 of bin
discharge, dam body construction made by fondation floating concrete
reinforcement type has spillway elevation + 147 m with a maximum water level
of 9 m from the bottom of the reservoir . Based on the technical data and the
location of the reservoir, where the downstream ponds are densely is necessary to
do the dam breach analysis.
Embung Tambakboyo dam breach simulation model done by 1-D model
simulation using the HEC RAS software 4.1.0 vesion. Input data is obtained from
flood hydrograph data from Design Note of Embung Tambakboyo. It analysis
based on rainfall analysis data which generates the maximum rainfall that may
occur in estimating maximum discharge used as the maximum flood discharge
( Probable Maximum Floods , QPMF ) with a value of QPMF = 327,981 m3/s. For
flood routing analysis, observations made to the maximum water level and
through to the downstream as the main observation point is Embung Tambakboyo
(RS 13+691) with spillway elevation + 147 m , constantly flooding until the
confluence with the Opak river (RS 0+000) throughout 13.691 km .
Dam breach simulation results of Embung Tambakboyo with program
HEC RAS 4.1.0 and QPMF as an input is 1) discharge due to dam breach sensitive
for breach time parameters and less sensitive to the slope of the fracture
parameters, 2) the sensitivity of Manning roughness coefficient affects to the
maximum water surface elevation generated, 3) the effect of damming on
downstream can increase the maximum water level in the downstream bridge and
cause runoff on embankment dam Tambakboyo 4) flood routing is done with the
results of simulating the conditions of maximum flood elevation at the end of the
simulation results and analysis in the form of Qpeak = 1.205,16 m3/s, hmax flood
from 3,18 m to 11,32 m, travel time total of the initial flood path is 2 hours and 56
minutes, travel time total of the flood peak is 4 hours 31 minutes. Inundation area
of each cross section maximum = 1.415,91 m2 and minimum of 27,94 m2. The
results obtained from the input data for flood inundation map-making as a result
of the collapse of the dam Tambakboyo certain conditions. |
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