Estuary Zone Based on Sea Level Salinity in Ciletuh Bay, West Java Dennisa Maghffira Tunjung, S. Supriatna, Iqbal Putut Ash Shidiq
Department of Geography, Faculty Mathematics & Natural Sciences, University of Indonesia
Abstract
The Estuary area is an area where there is a mixture of seawater with fresh water from the mainland. This estuary area is unique because the mixing of seawater with freshwater causes the formation of brackish water with fluctuating salinity. The fluctuation in salinity is influenced by the depth and shape of the water bed and the season. This study aims to analyze the estuary area (zone) in Ciletuh Bay, West Java based on the rainy and dry seasons associated with bathymetry. The salinity value is obtained from Sentinel-2A image processing, using the calculation of the salinity estimator algorithm, namely the Cilamaya Algorithm. The results showed that the mapping of the distribution of salinity forms the boundaries of the estuary, and the variables of rainfall and bathymetry affect the distribution of salinity values. The shallower the water, the lower the salinity level. Conversely, the deeper the waters, the higher the salinity level. This is due to the influence of the entry of freshwater into the sea, which is also related to the influence of rainfall (season), thus affecting fluctuations between saltwater and freshwater.
