Shanghai Chongming Island Green Grass Sand Project

　The Qingcaosha Reservoir was built under the divergence of the South and North Ports of the Yangtze River Estuary. It happens to be the place where the Yangtze River water and seawater meet. From the air, the water quality is slightly yellowed, which does not look as good as expected. Why is the reservoir chosen here? Engineers said that this is actually the brilliant point of the reservoir site selection. The yellowing of the water is because it contains sand, which produces ions after it meets and rubs with the sea water, which happens to become a natural coagulant, which can adsorb harmful substances and save a lot of alum. After these natural coagulants settle to the bottom of the reservoir, they can also be used in large-scale dike construction projects. Utilizing the power of nature can save a lot of money. In the past few days, the construction of the embankment of Qingcaosha Reservoir is stepping up. According to the characteristics of the tides of the Yangtze River Estuary, engineers have specially designed the depth and gate height of the reservoir. In addition to taking advantage of the natural water level difference, during the construction of the Qingcaosha Reservoir's cross-river diversion pipe, engineers also artificially created a water level difference, making the water inlet of Changxing Island slightly higher than the water inlet of Pudong. In this way, using the principle of siphoning, 7 million cubic meters of water flows from Changxing Island to Pudong every day, without the need to build a large pumping station in the middle. The Qingcaosha Raw Water Project has 9 major projects, each of which has energy-saving measures. These measures interact to form a large-scale energy-saving system.
　　 At present, a number of scientific research projects such as the utilization of wind energy in reservoirs have been established. The engineers said that there is still huge potential for the utilization of wind and tidal energy in the Qingcaosha Reservoir. The Qingcaosha raw water project will strive to become a national environmental protection model project.