Validation of Badan Informasi Geospasial Tide Model in the Sunda Strait Waters using Sebesi Island Tide Gauge Data

Badan Informasi Geospasial (BIG) has developed tide model using 128 tide gauges (TG) data in 2015. During the period of 2016-2020 BIG has established new 31 TG and these stations have not yet been included into the model, one of them was Sebesi TG located in Sunda Strait. The aim of this research was to validate the BIG tide model using latest data of Sebesi TG by comparing Harmonic Constituents (HC) and tide prediction. HC to be compared were M2, S2, N2, K2, K1, O1, P1, Q1 from BIG tide model and Sebesi TG data. Each HC were used to generate tide predictions for August 10-20, 2020 compared with Sebesi TG raw data. HC comparison results showed the maximum amplitude difference was S2(0.011 m) and minimum was Q1(0.001 m). The maximum phase difference was Q1(14.2170) and minimum was N2(1.4510). The RMS generated for tide prediction using BIG tide model HC compared to TG raw data was 17.788cm, while RMS generated for tide prediction using HC from Sebesi TG data compared to TG raw data was 17.707cm. The correlation between raw data and tide prediction using BIG tide model HC was 0.977 while the correlation between raw data and tide prediction using Sebesi TG HC was 0.980.