KAJIAN MODEL HIDRAULIK KANTONG LUMPUR BENDUNG COLO KABUPATEN SUKOHARJO
ABSTRACT: Wonogiri Dam has
been operated for many years, and has
been shallowed due to sedimentation. The sedimentation material almost reaches
the base elevation of dam intake (the limit of dead storage). This
condition gives impact to the sedimentation rate at West Colo Weir and East
Colo Weir intake. The solution of this condition has been done by constructing
sedimentation channel in West Colo Weir
as well as in East Colo Weir. In order
to achieve maximum result in planning, it is required to carry out a hydraulic modelling test for sedimentation
channel by constructing a model from
Colo Weir with charasteristic adjustment between model and prototype in the field. In this experiment, the model scale is nh = nl =
20 for the implementation in the
laboratory, which will be compared with the scale-making process and comparison
between sediment in the field and
sediment in the model. There are some model hydraulic test carried out in this
research, such as similarity test, movable model test, and modification test.
Based on the result of model test, there is an important thing should be
considered, i.e., the variation of channel flushing in East Colo would be
optimum if being done by doing this way : if channel 1 and 4 are flushed,
channel 2 and 3 must be closed or on the contrary for discharge 0,6 Qn, ; and
flushing being done simultaenously for full discharge. Whereas, in West Colo, flushing
can be done in the half of right channel first or half of left channel first. There are also some
changes compared with the initial design, such as change on base floor before
irrigation gate and add a gatewall in front of
flushing gate. The flushing result is satisfied, with average capacity
about 90% flushed-sediment.
Keywords: model hidraulika,
desain penyempurna, transpor sedimen, pembilasan, kantong lumpur
Penulis: Jaji Abdurrosyid, Purwoto
Kode Jurnal: jptsipildd060014
