The Test Of Slope Erosion Process And Micro-topography Evolution And Cellular Simulation

Slope soil erosion is one important factor leading to the soil loss.The study on water andsediment variation of soil erosion and the corresponding slope terrain is the keyscientific study. The erosion is influenced by topography, soil,vegetation,climate and humanactivities in natural conditions.Due to the temporal and spatial variability of above factors,the heterogeneity and multi-level feedback mechanism (such as: water erosion→theerodibility→terrain evolution→water erosion), slope erosion is a complexnonlineardynamics process. It is the more effective method to study this process thatthe various physical elements were measured in the physical model tests. The inputconditions (such as scouring flows, etc.) and output result(such as the dynamic relationshipbetween sediment concentration and slope erosion terrain) could be obtained in abovemethod.In addition,the non-linear simulation method is the important res earch method.It candepicts the performance of the multi-level feedback mechanism and macro-erosion processesin the erosion process.Firstly,the research is done by the physical model experiment and cellular theory. Thereare25working conditions including5slopes and5discharges in the experiment.Thedevelopment process of the water flow path, sediment elements and the slopemicrotopography were observed to analyze the intrinsic link during the runoff erosion.In the part of slope microtopography study, close-range photogrammetry measurementtechnique was introduced to get three-dimensional terrain information.It is based on3Dreconstruction theory of the computer binocular stereo vision.The same name point matchingand lens distortion process can directly affect the accuracy of three-dimensionalreconstruction.It provides an important research tool for analysising the terrain of slopeerosion,avoiding the instantaneous of traditional methods and the the high cost of3D laserscanner.In the theoretical research, cellular simulation method was introduced to building the erosion models after analyzing and comparing existing slope erosion model.Using the"bottom up" idea of Cellular method, It formulate rules including runoff flowing,generainglongitudinal channel, vertical channel broadening and channel lateral erosion in the cellularspace of the space corresponding to the slope erosion. The cellular program interactionmechanisms simulate the complex macroscopic phenomena by the local role.The simulationresults show that the cellular method is suitable to simulate the erosion process, especiallymacro-terrain of the slope. It could be a a powerful tool for simulating the slope soil erosionby refining the model parameters.