why is the blue lake blue in mt gambier
Blue Lake (South Australia) During December to March, the lake turns to a vibrant cobalt blue colour, returning to a colder steel grey colour for April to November. The exact cause of this phenomenon is still a matter of conjecture, but it is generally considered likely that it revolves around the warming of the surface layers of the lake during the summer months to around 20 °C (68 °F), causing calcium carbonate to precipitate out of the solution and enabling micro-crystallites of calcium carbonate to form. This results in scatter of the blue wavelengths of sunlight. During winter the lake becomes well mixed, and recent research indicates that during this phase of the colour cycle the lake is somewhat murkier due to the redistribution of tannins and calcium carbonate particles throughout the lake. Solar elevation has also been found to influence the perceived colour of the lake. The movement of planktonic life-forms within the lake during the seasons and during the day may additionally play a part in the colour change.
The Legend of the Blue Sea Filming began on August 19, 2016 in Goesan, North Chungcheong Province, South Korea. The production team then flew to Palau to film underwater scenes.[21] The cast and crew flew to Spain on September 11 where they filmed in A Coruña, Ribadeo, Lugo, Tossa de Mar and Castell de Santa Florentina[22][23][24] in Canet de Mar, as well as Begur (Es Cau Swimming Pool), Sitges (Town Hall and other backdrops) and Barcelona (exteriors of Palau de la Música Catalana, etc.),[25][26] among other places in Catalonia and Galicia (Spain).[27][28] The first script reading was held on October 8, 2016, two months after production began, due to the busy schedules of the actors. It lasted three hours and covered the first four episodes.[29]