Temporal and Spatial Evolution of Surface Soil Erosion in Mining Subsidence Areas

To study the temporal and spatial evolution of surface water and soil erosion on the slope surface of coal mining subsidence area, in this paper, indoor simulation experiments were conducted to study the characteristics of surface soil erosion on slopes under different rainfall intensity and slope conditions. Experimental studies show that the slope surface average velocity is directly proportional to the rainfall intensity. Under the same slope, with the increase of rainfall intensity, the average velocity of the slope increases. There is no obvious change rule of sediment concentration in the flow under weak rainfall; under the conditions of moderate and heavy rainfall, slope gradient has two stages of effect on the change of sediment concentration. In the first stage, as the gradient increases, the sediment concentration decreases, showing a negative effect. In the second stage, with the increase of slope, the sediment concentration increases nearly linearly, showing a positive correlation.