PERHITUNGAN NILAI CHART DATUM STASIUN PASANG SURUT KABUPATEN NATUNA BERDASARKAN PERIODE PERGERAKAN BULAN, BUMI, DAN MATAHARI

Abstract

Tides have an important role in coastal zone management, including for determining chart datum. Tides are influenced by the period of movement of celestial bodies. This research uses periods of 1 month, 1 year, and 6 years which aims to determine tidal, harmonic constant, and chart datum values. The method used for this research is the least squares method and uses chart datum calculations based on the DISHIDROS (Hydrographic-Oceanographic Service) and IHO (The International Hydrographic Organization) equations. The results of this research show that 1 month and 1 year data do not have effective chart datum values. 1 month period cannot explain the astronomical factors that cause the tides, even though the 1 year period produces a percentage value of rejected data of 0.05%, this data group has a relatively short observation period compared to 6 years. So, of the 3 groups of data processed, the most effective chart datum values are for the 6 year period. This period has the lowest variance and has a small percentage of blank values, the 6 year period can be classified as having good data quality. The recommended chart datum value for a 6 year period is 1.25m (DISHIDROS) and 1.06m (IHO)