Abstract

Abstract Coastal areas as a transition area between land and water plays an important role for coastal ecosystems habitat. Yet, the coastal areas are directly affected by surrounding activities from natural changes or human activities that cause dynamics of its coastline areas. Various coastal activities occurred in the estuary areas of Porong River (Kali Porong) in Sidoarjo Regency. Porong’s River has been the main river for discharging hot mud to anticipate the Lapindo Mud Embankment remaining stable since 2006 in response to the drilling incident by PT Lapindo Brantas. The presence of mud sediment carried in the Porong River impacted the shoreline dynamics at the river mouth, one of which caused the appearance of Lusi Island covering out an area of 94 hectares in 2013. Through this research, analysis was carried out using remote sensing methods and Digital Shoreline Analysis System (DSAS) tools to determine the value of changes (dynamics) of coastlines that occur in the Sidoarjo and Pasuruan coastal areas. Landsat imageries were applied for monitoring the shoreline dynamics for short data range (4 to 8 months) and long data range for annual monitoring between 2019 and 2022. The highest shoreline dynamics average value (highest accretion) for short data range was 52.699 meters and the lowest average value highest abrasion) was −34.116 meters. The highest shoreline dynamics average value (highest accretion) for long data range was 21.664 meters. Using a narrower (short) data range show more detailed trends of the shoreline changes. While varied shoreline dynamics using long periods of time were more effective using long data range. This study also produced modelling future shoreline in the Sidoarjo and Pasuruan coastal areas over 10 years up to 2035.

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