Author: tele

Upwelling is the phenomenon of the rise of the cold-temperature water and its sediments from the bottom of the waters towards the surface waters vertically that can occur in salt water (the sea) and freshwater (Lakes and lake) (Shaw, P.T., et al, 1996). On salt water (sea) which has a flow of water tends to be dynamic, this phenomenon is lifted from the base towards the aquatic nutrients surface waters. While in fresh water, the current water flow waters tend to be static, this phenomenon causes the rise of toxic material i.e. fish feed and fish droppings left containing ammonia (NH3) from the base to the surface of the water. In fresh water, at the time of the rise of oxygen reduction occurred because the material is pushed by toxic gasses (NH3) thus causing a number of dissolved oxygen levels dropped dramatically. A certain boundaries on these conditions very dangerous to fish because it can cause fish died from lack of DO. Some cases dead fish in large numbers due to the upwelling caused huge losses, for example in 2009 in Cirata lake upwelling caused 50 tons of fish died, in the same year at Lake Maninjau, West Sumatra as much 13,000 tons of fish died, and the last case in 2015 fish farmers in Lake Jatibarang, suffered losses of up to 400 million rupiah due to the death of fish caused upwelling. Departing from the above problems, we try to design a prototype system which aims to detect the symptoms of the occurrence of the phenomenon. The research is part of a research grant with this competitive grant scheme began working since 2015.