Characteristics of Surface Erosion and Deposition of Sandbag Sand Barriers in Urumqi Sandy Land
The erosion characteristics of sand barrier have important influence on its protective effect.In order to explore the effect of polylactic acid fiber(PLA)sandbag sand barriers on desertification control in Urumqi sandy land,four specifications of poly lactic acid fiber sandbag sand barriers were set with 0.5 m×0.5 m,1.0 m×1.0 m,2.0 m×2.0 m and 3.0 m×3.0 m.The concave surface shape inside the baffle was measured by suspension method.The morphological characteristics and erosion effect of concave surface in different specifications of sand barriers were analyzed.The results showed the wind erosion depth at the center of the concave surface of the sand barrier increaseed from 5.17 cm to 21.23 cm with the increase of the sand barrier specifications,and the stacking strength decreased from 3.86 g·cm-3 to 0.42 g·cm-3 with the increase of sand barrier size,which the accumulation turned to wind erosion in the barrier.The erosion coefficient was stable at 1/9～1/8,and decreased with the increase of sand barrier size.The deepest point of wind erosion in the barrier moved with the main wind direction.The wind erosion in the direction consistent with the main wind direction was greater,and the opening of the profile curve was larger.The concave surface fitting effect at the top of the slope was better than that at the middle and bottom of the slope.In summary,In Urumqi sandy land,wind erosion occurred mostly in northwest-southeast and west-east directions,the concave surface formed at the top of the slope was more stable,and the area should be suitable for laying 2.0 m×2.0 m PLA sand barriers.Above results could provide scientific reference for the rational application of PLA sand barriers in sand control project in Urumqi sandy land.
sandbag sand barrierconcave surfacecharacteristics of erosion and depositionUrumqi sandy land
国家科技期刊平台
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