GERUSAN DI SEKITAR ABUTMEN DAN PENGENDALIANNYA PADA KONDISI ADA ANGKUTAN SEDIMEN UNTUK SALURAN BERBENTUK MAJEMUK
ABSTRACT: Scour is erosion due
to water flow on the alluvial channel bed and channel wall. In fact, scour
happened in the bridge abutment is
total scour, that
is a combination
between local scour, general scour,
and constriction scour.
This research aim is to find the impact of screen and pile to scour
process and the depth of scour near abutment on live-bed scour condition.
This research was
carried out using
recirculation flume. The
channel model was a
compound channel and using
steady-uniform flow. The abutment model were Spillthrough type (ST) and
Wing-Wall (WW) type. Screen and pile
variation were used
as scour control
model. The depth
of scour near
abutment was measured in
each 6 hours running, The
research result shows that live-bed scour condition is the most critic
condition, and the depth of scour on this
condition is maximum. The depth
of scour is
mostly affected by
Reynold and Froude
number of channel
flow. The screen which
was placed on the upstream
of abutment at
optimum distance 1,75
Lb from abutment
ace gave highest reduction of scour depth compared
with other distances. In the case of 1-piled screen placed on channel bank at
1,75 L, it gave the best
scour reduction, i.e.
26,68% on live-bed
scour condition. In
general, the scour
pattern happened around abutment is
the same, either
using protection or
without protection. It
can be seen
on the scour
contour pattern. The scour contour pattern in this research
shows similar pattern witch shaped a
halp horseshoe with wide up at the side of abutment perpendicular to the stream
and lengthten up at downstream with the shallower scour depth.
Keywords: depth of scour, live-bed scour, scour pattern, screen,
sacrificial piles
Penulis: Jaji Abdurrosyid dan Achmad Karim Fatchan
Kode Jurnal: jptsipildd070002
