Why is the water in Venice so clean in Hengda Sea in Qidong?

Some of the blue light waves in visible light are projected into seawater and reflected by water and its dissolved substances, so what we see with the naked eye is blue, which should also be related to the dissolved substances in seawater.

Evergrande Maritime Venice Watertown is located on the north bank of the Yangtze River estuary of Chongming Island in Shanghai, on the southeast coast of Yinyang Town, Qidong City, Jiangsu Province, across the river from Shanghai. ? Evergrande Maritime Venice Watertown is a super-large comprehensive tourism and holiday residential area integrating hotels, conferences, restaurants, entertainment, sports, health care and business.

It is understood that how to create a special blue ocean in turbid seawater is a very technical project. To put it simply, we must first enclose the sea to form a sea of tranquility and avoid fluctuations. Then sand blowing is carried out to form pits with different depths on the seabed and collect sediments, so that the surface of seawater will become clean. When the suspended matter in seawater is reduced to a certain percentage and the depth reaches 6 meters, it will appear blue.