Water Turbidity Qualitative Analysis Based on Sentinel Imagery in Jeneberang River Downstream, Makassar, South Sulawesi

Jeneberang River watershed, especially in the downstream part, there is a decrease in clarity and an increase in water turbidity which is influenced by the presence of particles (sediment, algae and pollutants) that are suspended by the river natural process or because of the busy activities along the river, such as rock and sand mining activities, ports, settlements and industrial activities around the river. The analysis method using satellite imagery is used because it is considered very efficient and effective in saving time, energy and cost. The research begins by inputing sentinel-2A imagery data and Google Earth Engine as data processor. After that, followed by analyzing the Normalized Difference Water Index (NDWI) and the Normalized Difference Turbidity Index (NDTI) to determine the presence of surface water and water turbidity distribution from accumulation of silt and waste which is NDWI and NDTI are represented through the color index. Based on the results of the research in the NDWI and NDTI index and map, coastal area and the area along the river directly adjacent to the land were dominantly red, then on the transitional part between river and sea were dominantly green. This means that activity at the coastal and the river area directly adjacent to the land greatly affects the level of water turbidity.