The mountainous area is composed of limestone, and magmatic rocks are hidden under the plain soil. Limestone in mountainous areas was formed about 400 million years ago, with a pure texture and a slope of about 30 degrees from south to north. Limestone itself is not very dense, with cracks, cracks and caves, which can store and transport groundwater.
Groundwater flows out of the exposed surface along the inclined direction of limestone layer. It became the source of spring water. Magmatic rocks under the plain are closely organized. Therefore, after the groundwater flows here, it cannot flow through the magmatic rocks.
Magmatic rocks are covered with impermeable clay layers, so groundwater can't freely flow out of the ground. These blocked groundwater, with strong pressure, rushed to the ground from underground cracks and formed spring water.
Extended data:
Spring water provides an ideal water source for human beings, and can also constitute many ornamental landscapes and tourism resources. According to the different flow conditions, springs can be divided into geysers and ordinary springs. If there is no obvious water flow after groundwater emerges from the surface, it is called seepage. According to the temperature of water flow, spring water can be divided into hot spring and cold spring.
Spring water can be divided into eight grades according to its flow. The flow rate of the primary spring exceeds 65,438+000 cubic feet (2,800 liters) per second, the flow rate of the secondary spring ranges from 65,438+00 to 65,438+000 cubic feet per second, and the flow rate of the eighth spring is less than 65,438+0 pints per minute (8 ml per second).
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