STUDI KEDALAMAN GERUSAN LOKAL PADA PILAR JEMBATAN SIMPANG SURABAYA KRUENG ACEH, BANDA ACEH
Abstract: Simpang Surabaya
Bridge positioned at coordinates 5033'38” LU and 95019'4,1'' BT is located at
Kuta Alam sub-district of Banda AcehMunicipality. The bridge was built across
the river Krueng Aceh with ± 100 meters long with pillars to support the
bridge. Pillars were in the river, resulting in narrowing the river cross
section that led to disturbing river flow. Changes in flow velocity caused a
scour around the pillars, so it is necessary to study local scour depth on the
pillars. There are two types of pillars that existed. One type is located at
the upstream side with Cylinder Group-shaped pillars (circular combination
type) having the width of one meter and four meters long, while at the
downstream part, the pillar type is round pillar-shaped nose with the width and
length of one meter and three meters respectively. The aim of this research is
to determine the scouring effect on the pillars based on data taken in 2008 and
data from current measurement. While theactual local scour depth around the
pillars were measured using instrument Qliner where the river was divided into
two meters wide per section.Measurement data then is shown in the form of
contour and cross section. From field measurement, it is found that the
scouring depth at the upstream of the pillar is 0.88m whereas sedimentation
occurred at the downstream part of the pillar. By using the measurement data on
2008 and compared with the meassured data, it is found that the Simpang
Surabaya pillars were scoured noticeably and need to be protected. From the
calculation, the pillars should be protected using riprap with a diameter of
0.945 meters.
Penulis: Eldina Fatimah
Kode Jurnal: jptsipildd130626
