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[Objective] For the joint application of double-row high vertical nylon mesh sand barriers and grass checkerboard sand barriers, wind tunnel experimental studies were conducted to optimize the configuration of nylon mesh sand barriers porosity in the joint sand barriers and investigate the sand control benefits of the joint sand barriers under each porosity. [Methods] Based on the wind tunnel simulation experimental data, we carried out the characterization of the changes in the wind velocity flow field, aerodynamic roughness, friction wind velocity, sand transport rate with height, and sand blocking rate of the joint sand barriers with different porosities (40%, 45%, and 55%) at different wind speeds. [Results] (1) The area of wind shadow zone of the joint sand barrier was the largest at 40% porosity of nylon mesh sand barrier under the same wind speed. (2) As the porosity of the nylon mesh sand barrier increases, the aerodynamic roughness and friction wind speed decreased, and the values of aerodynamic roughness and friction wind speed of the joint sand barrier at 40% porosity were the largest at the same wind speed and the same location. (3) The sand transport rate on the surface increased with the increase of wind speed. Inside and on the leeward side of the joint sand barriers, the sand transport rate decreased exponentially with the increase of height, and the sand transport was mainly concentrated at the height of 0~12 cm. (4) Wind speed and sand barrier rate showed a negative correlation; sand barrier rate and porosity also showed a negative correlation, the porosity of 40% of the joint sand barriers had a better sand barrier rate; double rows of high vertical nylon mesh sand barriers and grass checkerboard sand fixation measures combined with the sand barrier rate superposition also existed. [Conclusion] Therefore, the combination of double-row vertical nylon mesh with 40% porosity and grass checkerboards can realize better configuration and sand control benefits. |
