Main engineering measurements and mechanism of blown sand hazard control
风沙危害防治的主要工程措施及其机理

Through deeply studying on main engineering measurements and mechanism of blown sand hazard control,the relation between the max wind erosion depth of straw board check sand break and side length of straw board check sand break is theoretically concluded.Using the fluid mechanic theory the different straw height H 0 above the ground and relative max space L are computed.We conclude that sand shear velocity in check sand break decreases with the in - crease of different sand break types and the rate of depth and width H/L ,and set up the rela - tion between the rate of leeward wind velocity and upward wind velocity of barriers and distance of leeward of barriers.We also study the effect of blown sand blocking and transporting of dif - ferent pore rate of nylon net barriers ,the aero-rough features of high standing plant and Gobi gravel mulch and chemical sand fixing measure and so on.Through comprehensive review of the studied results ,the main problems and tasks facing blown sand engineering are analyzed.The paper points out that close combination of eco-environment control-natural resource develop - ment and sustainable development is a way for blown sand control ' s development in the future.In the meantime ,the theory of study on the combination of blown sand hazard control of eco-environment recover and natural effective development ,and technological examples needs to be strengthened.