OFFSHORE HYDROGRAPHIC DATUM: ESTABLISHMENT OF HYDROGRAPHIC SEPARATION MODEL AROUND MAHAKAM DELTA, IN EAST KALIMANTAN

• Main Author: Kristiawan, Lim, Albert
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/82100
• Institution: Institut Teknologi Bandung

The Mahakam Delta in East Kalimantan is crucial for oil and gas exploration in Indonesia. However, the reliance on a single chart datum (CD) at Handil for sea level measurements has led to operational disruptions due to the uncertain sea level values. To address these issues, developing a robust system to better define sea level values is essential. One effective solution is to build a hydrographic separation model. The offshore hydrographic separation model is essential for accurately describing and transforming the positions of tidal datums relative to an ellipsoid. This model is particularly useful for converting the position of Mean Sea Level (MSL) to Lowest Astronomical Tide (LAT). In this project, the goal is to create such a model for the area extending from the Mahakam Delta to Peciko-Bekapai, leveraging Global Mean Sea Surface (MSS) models and tidal models. The hydrographic separation model was developed to address the challenges of sea level uncertainty in the Mahakam Delta, crucial for oil and gas exploration and maritime operations. The project utilized the CNES CLS2022 MSS model for Mean Sea Surface (MSS) and the TPXO9v5a tidal model for Lowest Astronomical Tide (LAT) due to their minimal absolute mean error values. The model was implemented as a WebGIS application to enhance accessibility and usability. The implementation of hydrographic separation model as a website application has facilitated real-time, accurate sea level predictions, greatly enhancing shipping operations and safety. The product analysis yielded results indicating an 111.94% increase in the frequency of ship shipping operation windows around the Mahakam area.