Why does diaoshuilou waterfall never freeze and stop flowing

For example, in winter, if you put a stick in one bucket and the other one doesn't, you will find that the one who put the stick first completes the freezing of the bucket. The water flow of the waterfall is usually fast, so it's difficult to generate such a fulcrum, and the water will melt the ice, If the speed of melting is faster than that of freezing, it's ok if the waterfall doesn't freeze