Aplikasi Multibeam dan Side Scan Sonar untuk Mendeteksi Target Runtuhnya Jembatan Kartanegara di Kutai Kalimantan Timur

Abstract

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.