Tiga dekade laju perubahan garis pantai di Kota Dumai

Abstract

Mapping of coastline changes helps in coastal development and monitoring. The city of Dumai, on the east coast of Riau Province, has undergone significant and radical changes caused by the intervention of humans and nature over the past three decades. This study mapped and measured the rate of change of the coastline of Dumai City for 30 years. The Landsat (TM, and OLI) image series, 1990, 1999, 2008, and 2020 became a data source to generate coastlines through on-screen digitization techniques, then to study the temporal behavior of coastlines using the Digital Shoreline Analysis System (DSAS) and geographic information systems to describe the spatial and temporal variations of coastlines. The results showed that the coastline length during the observation ranged from 123,14 to 125,23 km, while the average accretion rate was 1.17 meters per year while the average abrasion rate was 2.04 meters per year. Those rates of change affected coastline expanded to the sea for 60,82 hectares and eroded 760,20 hectares coastline to the land.

The sedimentation and shoreline change on the coast of Tanjung Kapal Cape, Rupat Island

“…The utilization of Geographic Information Systems (GIS) is one of the cheap and easy methods for obtaining coastal dynamics data (Puspita et al 2021). The United States Geological Survey (USGS) has developed a plug-in for GIS called the Digital Shoreline Analysis System (DSAS) which uses an observation-based approach (Mulyadi et al 2022). DSAS works by considering the created baseline and shoreline, allowing the distance between them to help in calculating shoreline changes that are directly connected to attribute data.…”