Experimental Study On Different Soil Bulk Density Affecting Soil Erosion Under Simulated Rainfall Conditions

In this study, indoor artificial rainfall experiment on the variation of the characteristics of different soil bulk density under the conditions of sheet flow, the relationship between soil bulk density and soil erosion as well as different rainfall intensities, soil bulk density under the conditions of the impact of soil erosion, a preliminary study. On the one hand to provide a basis for better understanding of different soil bulk density under the conditions of soil erosion law, to accurately predict soil erosion under different soil bulk density conditions, and select the appropriate soil and water conservation measures; the other hand, further reveals the different soil bulk density under the soil erosion dynamic process mechanism. The main results of this study include:(1) Soil bulk density under the conditions of production and flow characteristics, with the soil bulk density increases, the gradual increase in the runoff, which is due to the rainfall intensities and slopes under certain conditions, antecedent soil moisture near saturation state, soil bulk density changes in the dominant factor of change of runoff, soil bulk density, the greater the surface will be firm to the soil to further penetrate the ability to reduce surface rainfall infiltration, surface runoff increases.(2) Flow variation in soil bulk density under the conditions of certain conditions of rainfall intensity, flow changes in different bulk density under the conditions of the general trend of increase.(3) Changes in runoff flow rate is characterized by different soil bulk density under the conditions of different bulk density under the conditions of slope flow in the slope of the three different locations is gradually reduced, the slope of the lower part of the flow rate of the largest; under different soil bulk density within the whole slope, runoff flow velocity is characterized by:the runoff flow rate of the overall upward trend.(4) In the slope of a certain (5°) rainfall intensity of60mm/h, the soil bulk density1.0g/cm3-1.6g/cm3conditions, with the increase of soil bulk density, runoff, erosion and soil bulk density, there is a similar linear relationship, namely:Can be drawn based on the test study:at a certain slope, rainfall intensity conditions, with the increase of soil bulk density, runoff erosion is constantly increased.(5) In the slope of a certain (5°), rainfall intensity of30mm/h,60mm/h and90mm/h, the soil bulk density were1.0g/cm,1.3g/cm3, of1.6g/cm3different levels of conditions as rainfall intensity and soil bulk density increases runoff, flow, and flow rate continuously increased. For runoff and sediment yield characteristics in the same rainfall intensity conditions, with the rainfall intensity and soil bulk density increases, the sediment yield also more and more, increasing the intensity of erosion, when a larger rainfall intensity and large combination of slope, the greater the soil bulk density, the more the sediment yield.