水的地质作用（Geological processes of water）.docVIP

水的地质作用（Geological processes of water） Geological processes of water The cycle of water - the continuous movement and transformation of atmospheric water, surface water, and ground water. The water cycle is divided into its circulation range: The great cycle refers to the cycle of the whole earth, between the ocean and the land. Small loop - refers to the earths local range of the cycle. I. geological processes of surface water flow The geological processes of surface water flow include: Erosion - the constant destruction of the original ground. Transport function - surface water carries away the broken material on the ground. Sedimentation - the deposition of some substances that cannot be continued when the flow velocity of the surface decreases. Two, the geological role of temporary water flow (I) leaching and residual layer (Qel); Leaching - when atmospheric precipitation seeps into the ground, it dissolves and dissolves the small particles and soluble components near the ground surface, while some loose materials which are not easy to remove and are difficult to dissolve are left in situ. A loose, broken substance that remains in place. Results: the rocks near the surface gradually lose their integrity and compactness. Characteristics of residual layer (Qel): 1., below the surface of the earth, above the bedrock weathering zone, the extent of fragmentation decreases from the ground surface to the ground; The material composition of the 2. residual layer is basically the same as that of the underlying bedrock; The thickness of the 3. residual layer is related to topography, precipitation, chemical composition in water and so on; The 4. residual layer has larger porosity and higher water content, but its mechanical properties are poor. (two) scrub and Qdl; Washing: atmospheric precipitation in the collection before the formation of overland flow along the hillside slope, weathering processes will cover the slope on the broken hill at the foot of the material to wa