关键词: 库布齐沙漠, 工程防沙试验, HDPE网, 植物纤维网, 防风固沙效应

Abstract: We established an experimental area of new materials of HDPE net and plant fiber net sand barriers in the shifting sand dune area of the Hobq Desert. The MetOne 014A/024A 8 channels anemometers, 8 channels sand collectors and the steel drills were used to observe the vertical velocity distribution, amount of sediment transport, erosion and accumulation intensity near the surface under the influence of the new material sand barriers with different specifications. The fixing efficiency was comparatively analyzed among different specifications of the HDPE sand barriers, plant fiber sand barriers and the vertical sand blocking fences. The results show that:(1) The wind speed variation in the center of barriers with 50% porosity is only closely related to the sand barrier plane specifications and the exposure hight (h) rather the test materials. Given the same plane specification, the higher the exposed height (h) is, the more obvious amplitude of velocity reduces; With the same exposed height (h) of the sand barriers, the sand barriers with the small size have a more significant effect of reducing wind. (2) The sand barrier and the sand control system have a significant effect on the wind-blown sand transport; the wind-blown sand transport in the center of the 5 m×5 m (h=100 cm) plant fiber net checkerboard sand barriers is far less than the 1 m×1 m (h=20 cm) HDPE checkerboard sand barriers at the shifting sand area. The sand fixing effect of the large size sand barriers is better than the small size sand barriers; (3) The erosion and deposition of the sand barriers' surface is only related to the specification and no correlation with the materials.

Key words: Hobq Desert, sand-prevention engineering experiment, HDPE net, plant fiber net, sand-fixing effects