Study On Quantitatively Characterization Of The Surface Characteristics Of Splash Erosion Using Of Nano Magnetic Materials

In order to study the feasibility of the method of characterizing the surface features of the splash erosion of nano magnetic materials,this study first replaced the soil with non-magnetic quartz sand by setting different concentrations(1.5%,2.5%,3.5%)and different particle diameters(20 nm,200 nm),and through the simulated splash erosion in laboratory,this study intended to disclose the interrelation between the magnetic variation on nano magnetic materials and the surface characteristics after splash erosion by using Magnetic susceptibility meter and Three-dimensional Laser Micro-topographical Scouldner,and,accordingly studied the feasibility of tracing to splash erosion via the nano magnetic materials.Then,this feasible method was applied to the study of splash erosion of the collapsed wall to explore the characteristics between magnetic properties of 20 nms magnetic materials(3%,5%,7%)and the characteristics of splash erosion.The main conclusions were as follows:(1)The quartz sand magnetic background values improved by 20 nms magnetic materials were much higher than that by 200 nms magnetic materials,and two nano-magnetic materials showed the characteristic that the higher the concentration was set,the longer the tracing time was.The 20 nm magnetic(p<0.01),and the magnetic susceptibility change of the quartz sand was higher than that of the 200 nm magnetic materials at 3.5%nm within 3 minutes.The magnetic susceptibility to 20 nms materials had a significant correlation with micro-topography,and it could trace to 2?8 mm erosion thickness of the micro-topography which indicated that 20 nms magnetic materials could effectively trace to the characteristics of splash erosion in a certain period of time.So the method of quantitatively characterizing the splashing characteristics of the quartz sand was feasible.(2)After setting 20 nm magnetic materials,the topsoil magnetic susceptibility to disturbed soil had risen in 1.1?6.3 times.The three soil layers showed the best anti-splashing ability at 7%concentration,and at this concentration,the spastic erosive sedimentation rate and the splash amount showed a consistent change with the splitting time in a certain period of time.It was found that there was a logarithmic function equation ?1=aln(t)+b betweeny ?1(the magnetic susceptibility of top soil)and t(splash erosion time),which showed that the 20 nm magnetic materials could quantitatively represent the change of the splash amount.The disturbed red soil layer could effectively characterize the erosion thickness of the micro-topography in a short time,but the sand layer could only characterize the initial surface features of the splash,and the debris layer had no characterization effect.The disturbed soil micro-topography could be characterized by erosion in the range of-10 to 15 mm.The experimental results showed that the 20 nm magnetic materials could represent the splash surface features of the reshaped disturbed soil in a short time,and the application of the nano magnetic materials to the splashing feature was feasible.(3)The magnetism increased up to 3.8?1 L1 times in undisturbed soil,and the red soil layer shows strong anti-erosion ability.The susceptibility of the surface layer of the undisturbed soil decreased with the prolongation of the splash time,and the relationship was the same as the logarithmic function of ?1=aln(t)+b.The susceptibility of the surface layer of the red soil layer and the debris layer at the concentration of 7%could be quantitatively represented the splash amount,while the sand layer showed weak representative effect.And the dissolution of the the collapsed wall ?2 and the splashing amount M showed a ?2=aMb power function.The red soil layer characterized the erosion thickness in the late splash.The sand layer could only characterize the surface micro topography erosion thickness at the earliest stage of splash erosion,and the debris layer could not be characterized by surface features.During the whole splashing process,the erosion degree of the micro structures of the collapsed wall soil was only quantitatively quantified in the range of-10?15 mm.The results showed that the 20 nm magnetic materials had a certain effect in the short time,but the overall effect was weak.In general,the application of 20 nm magnetic materials in the collapsed wall could quantitatively characterize the surface of the splash in a short time.Due to the different composition of the disturbed soil and the undisturbed soil,the undisturbed surface was represented by the nano magnetic materials in much shorter time with poorer effect.The method of quantitatively characterizing to the splashing characteristics of soils in 20 nm magnetic materials proved to be feasible.