Study On Preventing Erosion Effect Of Cropland Intercropping Strips Stubble By Wind Tunnel Model

Based on the realistic characteristics of Intercropping Strips Stubble in the north region of YinShan mountain,applied the analogical theories, the paper studies on preventing erosion effect of intercropping strips stubble (The rape makes with the potato) by wind tunnel simulation, aimed to offer the reference data of establishing the optimum strips breadth, the optimum overlay degree and stubble height of Intercropping Strips Stubble. The model was designed with 1: 4 scale, strips width of protection tillage and tradition farming are uniform, to analyze the construction characteristics of the wind velocity flows, the wind velocity lowering rate compared with the wind velocity of farmland and aerodynamic roughness along lengthways of strips under the different experiment wind velocity, diverse width of strip, dissimilar residual stubble density and residual stubble height term. the conclusion from analysis as follows: the construction characteristics of the wind velocity flowing are resemble in different circumstance, intercropping strips stubble can lower the wind velocity effectively, to the tradition farming strips which takes protective effect,the wind velocity lowering rate compare with the wind velocity of farmland on lee side are far larger than windward side in the tradition farming. The wider strips, the worse preventing erosion effect in the tradition farming. Preventing erosion effect swells with residual stubble density and height increase. Intercropping Strips Stubble rises ideal protection effect, the width should choose 4.8 meters, the density should choose 26,000 stubs/acres, the residual stubble height shouldn't be less than 30 centimeter. The aerodynamic roughness and residual stubble density as well as residual stubble height have good relativity, which is the form of exponential function, however they are to the degree of preventing erosion effect not same.