Dangers of soil erosion:
1 Destroy the land and devour farmland.
2 Reduce soil fertility and aggravate the development of drought.
3 Siltation raises the river bed and intensifies flood disasters.
4 Silt up lakes and affect development and utilization.
Soil erosion: The process in which soil and its parent material are destroyed, denuded, transported and deposited under the action of external forces such as water, wind, gravity, freezing and thawing.
Water and soil erosion: The destruction and loss of water and soil resources and soil productivity under the action of external forces such as water, gravity, and wind, including land surface erosion and water loss.
Water and soil conservation: Prevent water and soil erosion, reasonably protect, improve and utilize water and soil resources in sandy areas and hilly areas, maintain and improve soil productivity so as to give full play to the economic and social benefits of water and soil resources, and establish a good ecological and environmental undertakings. Hydraulic erosion: The entire process in which soil, soil parent material and other ground constituent materials are destroyed, denuded, transported, and deposited under the action of rainfall and raindrop splashing, surface runoff erosion, and infiltration of water.
Raindrop splash erosion: The phenomenon of displacement of soil structure and soil particles under the action of raindrop splash.
Mixed erosion: refers to a special type of erosion caused by the impact of water flow and gravity, often called debris flow. Glacier erosion is a series of phenomena in which glacial movement causes mechanical damage to surface soil and rocks.
Facial erosion: When rainfall on a slope cannot be completely absorbed by the soil, water accumulates on the surface. Surface runoff is formed due to gravity. The surface runoff that begins to form is in an unconcentrated and dispersed state. The dispersed surface runoff washes away. Traveling surface soil particles
Gully erosion: On the basis of surface erosion, especially rill-shaped surface erosion, the scattered surface runoff gradually concentrates due to the influence of the surface, forming a fixed flow path called concentration. The process of surface runoff or stream, concentrated surface runoff scouring the surface, cutting into the ground and taking away soil, parent material and broken bedrock, forming gullies. Sand flow: A mixed flow of air flow and the solid particles it carries.
Desertification: land degradation in arid, semi-arid, subhumid and arid areas caused by various factors including climate variability and human activities
Sand transport amount; airflow passing through a unit in a unit time The amount of sand transported by the width or area
Sandstorm: Strong winds raise dust on the ground, making the air turbid and severe weather with horizontal visibility less than 1,000 meters.
Divided according to the types of external forces that cause soil erosion: hydraulic gravity wind freeze-thaw glacier mixing biology chemistry. According to the time of occurrence, it is divided into ancient erosion and modern erosion. According to the speed of occurrence, it is divided into accelerated erosion and normal erosion. Classification of debris flow: according to the solid material composition, debris flow, water-rock flow and mud flow. According to the nature of the debris flow, it can be divided into dilute debris flow and sticky debris flow. According to the dominant factors, it can be divided into glacial type, rainfall type, soil erosion type zoning principles: 1. The soil erosion type and erosion intensity in the same area should be basically the same. 2. The main factors affecting soil erosion in the same area, etc. Natural conditions and socio-economic conditions are basically the same; 3. The governance directions, measures, and land use directions in the same area are basically similar; 4. Natural boundaries are the main focus, giving due consideration to the nature and geographical continuity of the administrative region.