The Geomorphological Dynamic of the Rupat Strait on the East Coast of Central Sumatera Island, Indonesia

The Rupat Strait on the eastern coast of Sumatera Island is currently undergoing a geomorphological process due to current system, which flows from Malacca Strait, and change use hinterland. main purpose this study identify dynamic by analyzing changes width depth strait. We propose remote sensing method using satellite imagery evaluate depth. was also measured echo sounding at 60 stations. studies oceanographic observation sedimentation were carried out along coastal area Dumai City five stations each coast. results showed that although strait had increased 6.91 km in 1997 7.63 2017, length not changed over period. Therefore, 82.544 km² 20 years 463.687 544.231 2017. Over 28 years, has 1.5–2.7 meters. are abrasion sedimentation, caused accretion coasts Island, go around Strait. occupied strong velocity, high-wave energy, steep bottom topography, coarse-grained sediments, it reversed areas. can be used guide stakeholders utilization management shallow marine waters.