SAIFUR ROHMAN. APPLICATION OF MULTIBEAM AND SIDE SCAN SONAR FOR DETECTING TARGET
FROM THE COLLAPSED BRIDGE IN KUTAI EAST
KALIMANTAN. SUPERVISED
BY HENRY M MANIK AND DJOKO HARTOYO.
Kutai Kartanegara bridge is a suspension bridge crossing over Mahakam River
in East Kalimantan. This bridge is to facilitate between Tenggarong and Samarinda city. However, on 26 November 2011 Kutai
Kartanegara bridge damaged. Thus, pushing many people took to the field for the
evacuation and search for the cause of the accident. The objectives of this
research are to find out bottom information such as water depth and position of
the target from the collapsed bridge to assist in the evacuation process. Multibeam
and side scan sonar (sss) is a hydroacoustic instrument capable of detecting bathymetry
and determine the condition of the sea bottom. In this survey, the data
acquisitions are conducted by using a Multibeam Reson Hydrobat and SSS EdgeTech
4200. Bathymetric data were processed using PDS 2000 and a Caris HIPS & SIPS
6.1 software, side scan sonar data were processed with SonarWeb and a Caris HIPS
& SIPS 6.1 software, and analism of the amplitude value from the target with the help of SeiSee and a Xtf2segy
software. The results of the research are bathymetry map with depths ranging
from 4.07 meters to 58.15 meters and found the targets of sea bottom that have
the shape of frame of the
bridge, target-shaped box / square, strap-shaped targets, target-shaped small bumps,
and target objects straped. The mosaics of acoustic wave reflection intensity
were resulted from the sea bottom and have been obtained the estimation value
of the highest amplitude from the target shape of frame bridge is 7200 – 7974
mV and the lowest of the substrate around the strap-shaped target is 258-454 mV.
Keyword: Suspension bridge, Multibeam and Side Scan Sonar, Data acquisition,
Bathymetry and target.
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