What's the mystery of Qingyu Spring Well?

In the areas of Sichuan, Guangxi and Hunan, some springs and wells are very strange, and the water color changes of springs and wells can predict the local weather changes quite accurately. For example, in Xiang Ding Township, Gulin County, Sichuan Province, a spring is exposed in the limestone layer. The spring water forms a sky-blue pond with a water surface area of 50 square meters in the low-lying exposed area. Whenever the weather turns from sunny to rainy, the water turns black, and before the rain turns sunny, the water turns yellow. A day or so after the weather changed, the water turned blue again. If the water in the pond is colorful, next year will be fine. For example, Chongqing Hot Spring Park has a pool of cold mineral water. When the water in the spring pool is clear and transparent, it indicates that the weather will clear up. When the pool water becomes turbid and frothy, it implies that it is going to rain. If the pool water is particularly turbid and there are many bubbles, it indicates that there will be heavy rain or heavy rain. The observation data for many years show that the water color change of this spring pool is very accurate in forecasting the weather. There is such a spring near Sujia Village, Haiyang Town, lingchuan county, Guangxi. When the spring water is clear, the weather is fine and it won't rain for a day. When milky water like rice soup flows out of the spring, it will rain within three days. Just after a day of rain, the amount of mud in spring can also predict rainfall. On rainy days, if the spring water begins to clear, the weather will clear up. Locals can know the weather changes according to the daily changes of spring water.

On the east side of the new site in Qingfeng Township, Gui County, Guangxi Province, there is a pond formed by spring water, with a water surface area of about 3 mu and several springs with a daily flow of about 30,000 tons at the bottom of the pond. The water in the pool is clear and overflowing all the year round. Strangely, before the heavy rain comes, the water in this spring pool will turn pale red every 12 hour. According to the determination, the pool water contains more than 20 kinds of trace elements such as strontium and radon. However, it is still a mystery why the pool water will turn red before the rainy day.

On the ridge of Hechi Village, Zhu Shi Town, Dongkou County, Hunan Province, there is an ancient well with a history of more than 500 years. For hundreds of years, well water has been clear and colorless, and there is water all the year round. The depth of the well is 2m, and the length and width are 1.5m respectively. Since 1979, there has been an abnormal phenomenon in this well: every day before heavy rain, the well water will turn dark brown and bitter, and after 3-5 hours, the water quality will return to its original state. This ancient well predicts the change of weather through the change of water color, and it is accurate every time. Why this well has such a strange function is still a mystery.