Why do lakes disappear in one day and night?
Under the Beauty Peak in Yangshuo, Guilin, a tourist resort in China, there is a Rhinoceros Lake with an area of ??about 200,000 square meters. The lake water is not only sweet but also Very clear. Groups of fish and shrimps swim in the water.
However, what is strange is that on September 30, 1987, the lake disappeared overnight and the sky was visible from the bottom of the lake. Many fish and shrimps were struggling pitifully in the mud.
Why is this happening? It turns out that Guilin used to be a vast sea with many thick limestone layers deposited. Under the influence of humid and hot climate conditions, especially water with dissolved carbon dioxide, Molecules have a strong dissolution effect on limestone, causing it to form many underground caves, isolated peaks, stone forests, underground rivers and other natural landscapes. The bottom of Rhinoceros Lake is a limestone layer. There are not only some dissolved pores in these limestone layers, but also an underground river beneath the limestone layer. The dissolved pores in these rock formations are connected to underground rivers. The water in Rhino Lake continuously sinks into the underground river through many dissolved pores. Sometimes when there is a heavy rain, the rainwater will carry a lot of sediment into Rhinoceros Lake, so that the sediment will eventually sink to the bottom of the lake, blocking the dissolved pores that are the channels between the lake bottom and the underground river, and the lake water will immediately increase, and the lake surface will will rise. If it doesn't rain for a long time, the lake water will seep into the underground river through the holes, causing the lake water to slowly decrease. As time goes by, the holes will accelerate the lake water to flow into the underground river, so that on the night of September 30, The lake water has completely disappeared without a trace. Whenever there is a heavy rain, the sediment in the lake water will block the dissolved pores, the lake water will increase, and the lake level will rise again as before.