MODELING OF SEDIMENT TRANSPORT AND MORPHOLOGICAL CHANGES IN BALIKPAPAN BAY

• Main Author: Fauzah, Syarifah
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62254
• Institution: Institut Teknologi Bandung

Balikpapan has residential areas, industry, trade, and vital objects spread from north to south along the coast of Balikpapan Bay. Balikpapan Bay is also included in the prospective new capital area which will result in these activities increasing very rapidly, so that the waters of Balikpapan Bay are important to review. This study aimed to determine the pattern of sediment transport and changes in the morphology of the seabed generated by tides and river discharge in Balikpapan Bay, East Kalimantan. The results of the hydrodynamic model simulation for sea-level elevation values can represent the condition of the waters in Balikpapan Bay. Model validation is done by comparing field data and model data from sea level elevation. The correlation coefficient value is 0.98; 0.97 for the skill value; the MAPE value is 1.5%, and the RMSE value is 0.15 m. Horizontally, when the dry season is characterized by low discharge, sediment distribution is concentrated in the bay mouth area with a maximum concentration of 1.42 kg/m3 at spring-flood tide. The maximum average sediment concentration occurs when the spring-ebb tide is 0.08 kg/m3. The distribution of total sediment particles in the dry season (low discharge) moves farther and broader than in the rainy season, with the highest average total sediment occurring during spring – ebb tide, which is 3.3×105 m3/s/m and a maximum value of 2.4×10-4 m3/s/m. Sedimentation was seen significantly at the head of the Balikpapan Bay (the estuary of the Sepaku River), about km 0 to km 1.2 calculated from the head of the bay (north), which caused a morphological change as high as 2 m.