Study On The Laws Of Wind-sand Movement And Numerical Simulation In Carla Bailey Engineering Area

Large scale water conservancy project construction in arid areas will destroy the original stable surface, and produce a large number of soil erosion. It became the source of sand. The strong wind has an adverse effect on the ecological environment. In order to understand the migration pattern of sand of Carabeli engineering field, and provide theoretical basis for the prevention and control of wind erosion. In this paper, the research object is the abandoned soil area in the project.We studied the law of sand transport around the abandoned soil field in Carla Bailey engineering area by the method of statistical analysis and numerical simulation. The conclusions are as follows:(1) The threshold wind speed and surface roughness length of the original landform are both larger than those of the spoil ground.(2) The variation of wind speed and wind speed fluctuation is complex and consist in the time series. The wind speed fluctuation increases with the wind speed and the height. The probability distribution of wind velocity fluctuation conforms to the Gauss distribution.(3) The amount of sediment transport in abandoned soil field and Gobi decreased with the increasing of altitude. When the wind speed increased, the amount of sediment transport and its distribution center of gravity increased. The difference of sediment yield between the layers on the original landform is smaller than that on the spoil ground. The spoil ground and the original landform had significant difference in the particle size distribution. There was a significant change in the sediment transport along the direction of the wind, but the percentage of sediment transport at the same height of different locations is roughly the same.(4) The farther away from the field, the flow field is less affected by the soil field, and the air is in the free development state. The more close to the abandoned soil field is, the more obvious the influence degree is. There is a zone sudden increase of the flow after the leeward slope 4m. The range from 2H to 3H is the main wind speed reducing area. Wind speed dropped to lowest value at the slope about 37m, wind speed began to restore growth along the airflow direction after 37m. The range from 4H to 12H, It is the air recovery area. Wind speed post strata tends to be stable after 12H of leeward slope.(5) When the air passes through the different position of the soil surface, the characteristics of the air changes significantly. It controls the movement characteristics of the wind-sand movement on the bed surface. The wind speed of slope shoulder is always higher than that of the same height. The sand concentration is lower near the slope shoulder. The leeward side wind speed decreases significantly. Sedimentary range of the leeward side is greater than that of the windward side.