Kajian Pasang Surut, Gelombang, dan Swell pada Saat Kejadian Banjir Rob di Belawan

Abstract

One of the high risk area for tidal flood is Belawan. Tidal flood in Belawan occur due to the interaction of tides, significant wave, and swell that influence each other. A tidal flood is the inundation of sea water on the mainland coast caused by high tides. The existence of high tide and low tides will affect to the condition of inundation occurred. The purpose of this research was conducted to determine the dynamics of those three sea-level phenomena during the tidal floods in Belawan on 2020. The tidal’s data of Geospatial Information Center, significant wave high, and swell are the result processing of Wavewatch-III model, and sea level high data is the result of Jason-2 altimetri satellite. The analysis of tidal’s data processing from Geospatial Information Center shows that the maximum tide happened on 17 October 2020 with value 2,47 meters, there is a shift of the highest tide’s peak in 3-4 days of spring tide position. The verification results of Geospatial Information Center and Jason-2 Altimetri satellite has good correlation value but the Jason-2 altimetri satellite data tends to be under estimated.